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CN112951346A - Mix proportion design method suitable for mixed recycled coarse aggregate concrete - Google Patents

Mix proportion design method suitable for mixed recycled coarse aggregate concrete Download PDF

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CN112951346A
CN112951346A CN202011381034.1A CN202011381034A CN112951346A CN 112951346 A CN112951346 A CN 112951346A CN 202011381034 A CN202011381034 A CN 202011381034A CN 112951346 A CN112951346 A CN 112951346A
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coarse aggregate
concrete
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mortar
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CN112951346B (en
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刘旭
吴瑾
燕朋朋
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention provides a mix proportion design method suitable for mixed recycled coarse aggregate concrete, and belongs to the field of recycled concrete. The main components of the coarse aggregate used by the mixed type recycled coarse aggregate concrete are natural coarse aggregate, recycled concrete coarse aggregate and recycled broken brick coarse aggregate, and the common concrete mixing proportion design method is not suitable for the mixed type recycled coarse aggregate concrete any more. The design method comprises the steps of firstly, adjusting the mortar density to minimize the density difference between the mortar density and each component of the coarse aggregate, so that the inhomogeneity of the coarse aggregate distribution in the hardened concrete is reduced; and then calculating the using amounts of water, cement and coarse and fine aggregates by combining an isovolumetric mortar substitution method and a minimum slurry theory, wherein the isovolumetric mortar substitution method ensures that the total content of new mortar and old mortar in the mixed type recycled coarse aggregate concrete is equal to the content of mortar in ordinary concrete, and the minimum slurry theory ensures that the content of cement slurry in the mixed type recycled coarse aggregate concrete can reach the minimum slurry content required by meeting the performance of concrete.

Description

适用于混合型再生粗骨料混凝土的配合比设计方法Mix ratio design method for mixed recycled coarse aggregate concrete

技术领域technical field

本发明涉及再生混凝土领域，尤其是一种适用于混合型再生粗骨料混凝土的配合比设计方法。The invention relates to the field of recycled concrete, in particular to a mixing ratio design method suitable for mixed-type recycled coarse aggregate concrete.

背景技术Background technique

在中国，随着城镇化的快速发展，大批多低层建筑被拆除，建筑垃圾的处理成为亟待解决的问题；与此同时，由于近几十年建筑业的飞速发展导致天然骨料过度开采，很多地区面临着资源枯竭。建筑废弃物就地处理再利用不但能在一定程度上缓解环境压力，同时能够减少废弃物的运输、天然骨料用量，从而带来经济效益。In China, with the rapid development of urbanization, a large number of low-rise buildings have been demolished, and the disposal of construction waste has become an urgent problem to be solved. The region faces resource depletion. The on-site treatment and reuse of construction waste can not only relieve environmental pressure to a certain extent, but also reduce the transportation of waste and the amount of natural aggregate, thereby bringing economic benefits.

多低层建筑多是由混凝土和烧结粘土砖作为主要建筑材料。由于建筑废弃物分选系统不够完善，由建筑废弃物破碎筛分所得的骨料多为再生混凝土骨料和碎砖骨料作为主要成分的混合型再生粗骨料。混合型再生粗骨料主要成分为天然粗骨料、再生混凝土粗骨料、再生碎砖粗骨料。三种骨料的密度存在较大的差异性，天然粗骨料密度最大、再生混凝土粗骨料次之，再生碎砖粗骨料密度最小；骨料与砂浆之间的密度差会造成新拌混凝土中骨料下沉或上浮，从而导致混凝土中骨料分布的不均匀性更加明显。另外，再生混凝土粗骨料和再生碎砖粗骨料表面均黏附一层旧砂浆，一般情况下，在进行再生混凝土配合比设计时，通常将再生粗骨料表面黏附的旧砂浆直接作为粗骨料的一部分，导致混合型再生粗骨料混凝土中砂浆含量多于普通混凝土，从而对混凝土的力学性能和耐久性产生不利的影响。Many low-rise buildings are mostly made of concrete and fired clay bricks as the main building materials. Because the construction waste sorting system is not perfect, the aggregates obtained by crushing and screening construction wastes are mostly mixed recycled coarse aggregates with recycled concrete aggregates and broken brick aggregates as the main components. The main components of mixed recycled coarse aggregate are natural coarse aggregate, recycled concrete coarse aggregate, and recycled broken brick coarse aggregate. There is a big difference in the density of the three kinds of aggregates. The density of natural coarse aggregate is the largest, followed by the coarse aggregate of recycled concrete, and the density of coarse aggregate of recycled broken brick is the smallest; the density difference between the aggregate and the mortar will cause the fresh mix Aggregate in concrete sinks or floats, resulting in more obvious inhomogeneity of aggregate distribution in concrete. In addition, a layer of old mortar is adhered to the surface of recycled concrete coarse aggregate and recycled brick coarse aggregate. Generally, when designing the mix ratio of recycled concrete, the old mortar adhered to the surface of recycled coarse aggregate is usually used directly as coarse bone. As a result, the content of mortar in the mixed recycled coarse aggregate concrete is more than that of ordinary concrete, which adversely affects the mechanical properties and durability of concrete.

混合型再生粗骨料成分复杂，品质离散性大，具有吸水率大、强度低等缺陷。普通混凝土的配合比设计方法已不再适用于混合型再生粗骨料混凝土。针对混合型再生粗骨料特点，制定专门适用于混合型再生粗骨料混凝土的配合比设计规程是十分必要的，对混合型再生粗骨料混凝土在实际工程中的应用具有重要的应用价值。The mixed-type recycled coarse aggregate has complex composition, large quality dispersion, high water absorption, low strength and other defects. The mix ratio design method of ordinary concrete is no longer suitable for mixed recycled coarse aggregate concrete. According to the characteristics of mixed recycled coarse aggregate, it is very necessary to formulate a mix ratio design rule specially suitable for mixed recycled coarse aggregate concrete, which has important application value for the application of mixed recycled coarse aggregate concrete in practical engineering.

发明内容SUMMARY OF THE INVENTION

为了克服混合型再生粗骨料混凝土性能劣于普通混凝土的缺点，本发明提出一种适用于混合型再生粗骨料混凝土的配合比设计方法，该配合比设计方法可明显改善混合型再生粗骨料混凝土中粗骨料分布的不均质性，提高抗压强度和弹性模量，减小干缩。In order to overcome the disadvantage that the performance of the mixed recycled coarse aggregate concrete is inferior to that of ordinary concrete, the present invention proposes a mixing ratio design method suitable for the mixed recycled coarse aggregate concrete, which can obviously improve the mixed recycled coarse aggregate concrete. It can improve the compressive strength and elastic modulus and reduce the dry shrinkage of the inhomogeneity of the coarse aggregate distribution in the concrete.

本发明采用的技术方案是：首先通过调整砂浆密度使砂浆密度与粗骨料各组分之间的密度差达到最小，从而降低硬化后混凝土中粗骨料分布的不均质性；然后结合等体积砂浆取代法和最小浆体理论计算用水量、水泥用量、粗骨料、细骨料用量，等体积砂浆取代法保证混合型再生粗骨料混凝土中新、旧砂浆总含量等于普通混凝土中砂浆含量，结合最小浆体理论则可以确保混合型再生粗骨料混凝土中水泥浆体含量能够达到满足混凝土性能所需的最小浆体含量。The technical scheme adopted in the present invention is as follows: first, the density difference between the mortar density and each component of the coarse aggregate is minimized by adjusting the density of the mortar, thereby reducing the inhomogeneity of the distribution of the coarse aggregate in the hardened concrete; The volume mortar replacement method and the theoretical calculation of the minimum slurry amount of water, cement, coarse aggregate and fine aggregate. The equal volume mortar replacement method ensures that the total content of new and old mortar in mixed recycled coarse aggregate concrete is equal to the mortar in ordinary concrete Combined with the minimum slurry theory, it can ensure that the cement slurry content in the mixed recycled coarse aggregate concrete can reach the minimum slurry content required to meet the performance of the concrete.

上述混合型再生粗骨料的成分包括天然粗骨料、再生混凝土粗骨料、再生碎砖粗骨料。The components of the above mixed recycled coarse aggregate include natural coarse aggregate, recycled concrete coarse aggregate, and recycled broken brick coarse aggregate.

上述天然粗骨料指的是天然石料经破碎筛分得到的粒径不大于31mm，符合颗粒级配的粗骨料。The above-mentioned natural coarse aggregate refers to the coarse aggregate obtained by crushing and sieving the natural stone with a particle size of not more than 31 mm and conforming to the particle gradation.

上述再生混凝土粗骨料指由建筑拆除废弃物中混凝土构件破碎筛分得到的粗骨料。The above-mentioned recycled concrete coarse aggregate refers to the coarse aggregate obtained from the crushing and screening of concrete components in the construction demolition waste.

上述再生碎砖粗骨料指由建筑拆除废弃物中烧结粘土砖破碎筛分得到的粗骨料。The above-mentioned coarse aggregate of recycled broken bricks refers to the coarse aggregate obtained by crushing and screening sintered clay bricks in construction demolition waste.

上述混合型再生粗骨料混凝土配合比设计方法计算步骤如下：The calculation steps of the above mixed recycled coarse aggregate concrete mix proportion design method are as follows:

步骤一：确定混合型再生粗骨料混凝土水泥砂浆密度；Step 1: Determine the density of mixed recycled coarse aggregate concrete cement mortar;

步骤二：计算普通混凝土水泥砂浆体积；Step 2: Calculate the volume of ordinary concrete cement mortar;

步骤三：结合等体积砂浆取代法确定混合型再生粗骨料混凝土中新拌水泥砂浆体积；Step 3: Determine the volume of freshly mixed cement mortar in the mixed recycled coarse aggregate concrete in combination with the equal volume mortar replacement method;

步骤四：计算用水量

Figure RE-GDA0003050076270000021
水泥用量
Figure RE-GDA0003050076270000022
粗骨料，细骨料用量；Step 4: Calculate water consumption
Figure RE-GDA0003050076270000021
cement consumption
Figure RE-GDA0003050076270000022
Coarse aggregate, fine aggregate amount;

步骤五：利用最小浆体理论，根据粗骨料、细骨料用量计算混合型再生粗骨料混凝土所需的最小浆体含量，进一步计算最小水泥用量

Figure RE-GDA0003050076270000023
以及用水量
Figure RE-GDA0003050076270000024
Step 5: Using the minimum slurry theory, calculate the minimum slurry content required for the mixed recycled coarse aggregate concrete according to the amount of coarse aggregate and fine aggregate, and further calculate the minimum cement dosage
Figure RE-GDA0003050076270000023
and water consumption
Figure RE-GDA0003050076270000024

步骤六：若

Figure RE-GDA0003050076270000025
则水泥用量取
Figure RE-GDA0003050076270000026
用水量取
Figure RE-GDA0003050076270000027
若
Figure RE-GDA0003050076270000028
则水泥用量取
Figure RE-GDA0003050076270000029
用水量取
Figure RE-GDA00030500762700000210
Step 6: If
Figure RE-GDA0003050076270000025
The amount of cement used is
Figure RE-GDA0003050076270000026
water consumption
Figure RE-GDA0003050076270000027
like
Figure RE-GDA0003050076270000028
The amount of cement used is
Figure RE-GDA0003050076270000029
water consumption
Figure RE-GDA00030500762700000210

上述混合型再生粗骨料混凝土水泥砂浆密度计算过程如下：The calculation process of the above mixed recycled coarse aggregate concrete cement mortar density is as follows:

(1)试验测定混合型再生粗骨料中天然粗骨料、再生混凝土粗骨料和再生碎砖粗骨料的体积占比(1) Test to determine the volume ratio of natural coarse aggregate, recycled concrete coarse aggregate and recycled brick coarse aggregate in the mixed recycled coarse aggregate

Figure RE-GDA00030500762700000211
Figure RE-GDA00030500762700000211

其中，

Figure RE-GDA00030500762700000212
为每立方米混合型再生粗骨料混凝土中天然粗骨料的体积；
Figure RE-GDA00030500762700000213
为每立方米混合型再生粗骨料混凝土中再生混凝土粗骨料的体积；
Figure RE-GDA00030500762700000214
为每立方米混合型再生粗骨料混凝土中再生碎砖粗骨料的体积。in,
Figure RE-GDA00030500762700000212
is the volume of natural coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA00030500762700000213
is the volume of recycled concrete coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA00030500762700000214
It is the volume of recycled crushed brick coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete.

(2)计算砂浆密度(2) Calculate the density of mortar

Figure RE-GDA00030500762700000215
Figure RE-GDA00030500762700000215

其中，ρNA为天然粗骨料饱和面干密度；ρRCA为再生混凝土粗骨料饱和面干密度；ρRBA为再生碎砖粗骨料饱和面干密度；

Figure RE-GDA00030500762700000216
为混合型再生粗骨料混凝土中水泥砂浆密度。Among them, ρ NA is the saturated surface dry density of natural coarse aggregate; ρ RCA is the saturated surface dry density of recycled concrete coarse aggregate; ρ RBA is the saturated surface dry density of recycled broken brick coarse aggregate;
Figure RE-GDA00030500762700000216
is the density of cement mortar in mixed recycled coarse aggregate concrete.

上述普通混凝土水泥砂浆体积计算过程如下：The above-mentioned ordinary concrete cement mortar volume calculation process is as follows:

(1)每立方米混凝土体积(1) volume of concrete per cubic meter

Figure RE-GDA0003050076270000031
Figure RE-GDA0003050076270000031

其中，VNC为普通混凝土体积；

Figure RE-GDA0003050076270000032
为每立方米普通混凝土水泥用量；
Figure RE-GDA0003050076270000033
为每立方米普通混凝土天然粗骨料用量；
Figure RE-GDA0003050076270000034
为每立方米普通混凝土细骨料用量；ρc为水泥密度，应按《水泥密度测定方法》GB/T 208测定，也可取2900kg/m3～3100kg/m3；ρs为细骨料的表观密度，应按照现行行业标准《普通混凝土用砂、石质量及检验方法标准》JGJ 52测定；ρw为水的密度，可取1000kg/m3；α为混凝土的含气量百分数，在不使用引气型外加剂时，可取为1。Among them, V NC is the volume of ordinary concrete;
Figure RE-GDA0003050076270000032
It is the amount of cement per cubic meter of ordinary concrete;
Figure RE-GDA0003050076270000033
It is the amount of natural coarse aggregate per cubic meter of ordinary concrete;
Figure RE-GDA0003050076270000034
is the amount of fine aggregate per cubic meter of ordinary concrete; ρ c is the cement density, which should be determined according to the "Determination of Cement Density" GB/T 208, or 2900kg/m 3 ~ 3100kg/m 3 ; ρ s is the amount of fine aggregate Apparent density should be determined in accordance with the current industry standard "Standards for quality and inspection methods of sand and stone for ordinary concrete" JGJ 52; ρw is the density of water, which can be 1000kg/m 3 ; α is the percentage of air content of concrete, which is not used For air-entraining admixtures, it can be taken as 1.

(2)普通混凝土砂率(2) Sand rate of ordinary concrete

Figure RE-GDA0003050076270000035
Figure RE-GDA0003050076270000035

式中，

Figure RE-GDA0003050076270000036
为普通混凝土砂率。In the formula,
Figure RE-GDA0003050076270000036
For ordinary concrete sand rate.

(3)每立方米混凝土中水泥砂浆体积(3) volume of cement mortar per cubic meter of concrete

Figure RE-GDA0003050076270000037
Figure RE-GDA0003050076270000037

上述混合型再生粗骨料混凝土中新拌水泥砂浆体积计算过程如下：The volume calculation process of freshly mixed cement mortar in the above mixed recycled coarse aggregate concrete is as follows:

(1)试验测定再生混凝土粗骨料和再生碎砖粗骨料表面黏附旧砂浆含量(1) Test to determine the content of old mortar adhered to the surface of recycled concrete coarse aggregate and recycled brick coarse aggregate

Figure RE-GDA0003050076270000038
Figure RE-GDA0003050076270000038

Figure RE-GDA0003050076270000039
Figure RE-GDA0003050076270000039

其中，OMCRCA为再生混凝土粗骨料表面黏附旧砂浆含量；OMCRBA为再生碎砖粗骨料表面黏附旧砂浆含量；mRCA为去除旧砂浆前再生混凝土粗骨料的绝干质量；mONA为去除旧砂浆后再生混凝土粗骨料中粒径大于4.75mm成分的绝干质量；mRBA为去除旧砂浆前再生碎砖粗骨料的绝干质量；mOBA为去除旧砂浆后再生碎砖粗骨料中粒径大于4.75mm成分的绝干质量。Among them, OMC RCA is the content of old mortar adhered to the surface of recycled concrete coarse aggregate; OMC RBA is the content of old mortar adhered to the surface of recycled brick coarse aggregate; mRCA is the absolute dry mass of recycled concrete coarse aggregate before the old mortar is removed; m ONA is the absolute dry mass of the coarse aggregate of recycled concrete after removing the old mortar; m RBA is the absolute dry mass of the coarse aggregate of recycled bricks before removing the old mortar; m OBA is the dry mass of the recycled bricks after removing the old mortar The absolute dry mass of the coarse aggregate with a particle size greater than 4.75mm.

(2)每立方米混合型再生粗骨料混凝土中天然骨料、再生混凝土粗骨料、再生碎砖粗骨料体积(2) The volume of natural aggregate, recycled concrete coarse aggregate and recycled brick coarse aggregate in mixed recycled coarse aggregate concrete per cubic meter

Figure RE-GDA0003050076270000041
Figure RE-GDA0003050076270000041

Figure RE-GDA0003050076270000042
Figure RE-GDA0003050076270000042

Figure RE-GDA0003050076270000043
Figure RE-GDA0003050076270000043

Figure RE-GDA0003050076270000044
Figure RE-GDA0003050076270000044

其中，

Figure RE-GDA0003050076270000045
为普通混凝土中粗骨料体积；ρONA为去除黏附砂浆的再生混凝土粗骨料饱和面干密度；ρOBA为去除黏附砂浆的再生碎砖粗骨料饱和面干密度。in,
Figure RE-GDA0003050076270000045
is the volume of coarse aggregate in ordinary concrete; ρ ONA is the saturated surface dry density of the recycled concrete coarse aggregate with the adhesive mortar removed; ρ OBA is the saturated surface dry density of the recycled brick coarse aggregate with the adhesive mortar removed.

(3)每立方米混合型再生粗骨料混凝土中旧砂浆体积(3) Volume of old mortar in mixed recycled coarse aggregate concrete per cubic meter

Figure RE-GDA0003050076270000046
Figure RE-GDA0003050076270000046

其中，

Figure RE-GDA0003050076270000047
为每立方米混合型再生粗骨料混凝土中旧砂浆的体积。in,
Figure RE-GDA0003050076270000047
is the volume of used mortar per cubic meter of mixed recycled coarse aggregate concrete.

(4)每立方米混合型再生粗骨料混凝土中新拌砂浆体积(4) Volume of freshly mixed mortar per cubic meter of mixed recycled coarse aggregate concrete

Figure RE-GDA0003050076270000048
Figure RE-GDA0003050076270000048

其中，

Figure RE-GDA0003050076270000049
为每立方米混合型再生粗骨料混凝土中旧砂浆的体积。in,
Figure RE-GDA0003050076270000049
is the volume of used mortar per cubic meter of mixed recycled coarse aggregate concrete.

(5)每立方米混合型再生粗骨料混凝土各组分用量(5) The dosage of each component of mixed recycled coarse aggregate concrete per cubic meter

Figure RE-GDA00030500762700000410
Figure RE-GDA00030500762700000410

Figure RE-GDA00030500762700000411
Figure RE-GDA00030500762700000411

Figure RE-GDA00030500762700000412
Figure RE-GDA00030500762700000412

Figure RE-GDA00030500762700000413
Figure RE-GDA00030500762700000413

Figure RE-GDA0003050076270000051
Figure RE-GDA0003050076270000051

Figure RE-GDA0003050076270000052
Figure RE-GDA0003050076270000052

其中，

Figure RE-GDA0003050076270000053
为每立方米混合型再生粗骨料混凝土用水量；
Figure RE-GDA0003050076270000054
为每立方米混合型再生粗骨料混凝土水泥用量；
Figure RE-GDA0003050076270000055
为每立方米混合型再生粗骨料混凝土天然粗骨料用量；
Figure RE-GDA0003050076270000056
为每立方米混合型再生粗骨料混凝土再生混凝土粗骨料用量；
Figure RE-GDA0003050076270000057
为每立方米混合型再生粗骨料混凝土再生碎砖粗骨料用量；
Figure RE-GDA0003050076270000058
为每立方米混合型再生粗骨料混凝土天然粗骨料用量；
Figure RE-GDA0003050076270000059
为天然粗骨料自然状态下含水率；
Figure RE-GDA00030500762700000510
为天然粗骨料饱和面干状态吸水率；
Figure RE-GDA00030500762700000511
为再生混凝土粗骨料自然状态下含水率；
Figure RE-GDA00030500762700000512
为再生混凝土粗骨料饱和面干状态吸水率；
Figure RE-GDA00030500762700000513
为再生碎砖粗骨料自然状态下含水率；
Figure RE-GDA00030500762700000514
为再生碎砖粗骨料饱和面干状态吸水率。in,
Figure RE-GDA0003050076270000053
is the water consumption per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000054
is the amount of cement per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000055
It is the amount of natural coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000056
It is the amount of recycled concrete coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000057
For each cubic meter of mixed recycled coarse aggregate concrete recycled broken brick coarse aggregate dosage;
Figure RE-GDA0003050076270000058
It is the amount of natural coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000059
It is the moisture content of natural coarse aggregate in its natural state;
Figure RE-GDA00030500762700000510
It is the water absorption rate of natural coarse aggregate saturated surface dry state;
Figure RE-GDA00030500762700000511
It is the moisture content of recycled concrete coarse aggregate in natural state;
Figure RE-GDA00030500762700000512
is the water absorption rate of the saturated surface of the recycled concrete coarse aggregate in the dry state;
Figure RE-GDA00030500762700000513
It is the moisture content of the coarse aggregate of recycled broken bricks in the natural state;
Figure RE-GDA00030500762700000514
It is the water absorption rate of the saturated surface dry state of the coarse aggregate of recycled broken bricks.

上述混合型再生粗骨料混凝土最小用水量和最小水泥用量计算过程如下：The calculation process of the minimum water consumption and the minimum cement consumption of the above mixed recycled coarse aggregate concrete is as follows:

(1)骨料堆积度

Figure RE-GDA00030500762700000515
(1) Aggregate accumulation degree
Figure RE-GDA00030500762700000515

Figure RE-GDA00030500762700000516
Figure RE-GDA00030500762700000516

Figure RE-GDA00030500762700000517
Figure RE-GDA00030500762700000517

Figure RE-GDA00030500762700000518
Figure RE-GDA00030500762700000518

Figure RE-GDA00030500762700000519
Figure RE-GDA00030500762700000519

Figure RE-GDA00030500762700000520
Figure RE-GDA00030500762700000520

Figure RE-GDA00030500762700000521
Figure RE-GDA00030500762700000521

yS+yG＝1y S +y G =1

其中，yS和yG分别为细骨料和粗骨料的体积分数；kD为决定粗细骨料直径比影响的因子； ks为一个统计因子；x为细骨料堆积体积与粗骨料空隙体积之间的比值；x0＝0.4753，k0＝0.3881；φST，φGT分别为细骨料和粗骨料的特征堆积度；ρST，ρGT为细骨料和粗骨料的堆积密度；ρS，ρG分别为细骨料和粗骨料的颗粒密度；dST，dGT分别为细骨料和粗骨料的特征粒径，可取筛余量为36.8％时骨料的粒径作为特征粒径。Among them, y S and y G are the volume fractions of fine aggregate and coarse aggregate, respectively; k D is a factor that determines the influence of the ratio of coarse to fine aggregate diameter; k s is a statistical factor; The ratio between the void volumes of the aggregates; x 0 =0.4753, k 0 =0.3881; φ ST , φ GT are the characteristic packing degrees of fine aggregate and coarse aggregate, respectively; ρ ST , ρ GT are fine aggregate and coarse aggregate ρ S , ρ G are the particle densities of fine aggregate and coarse aggregate, respectively; d ST , d GT are the characteristic particle size of fine aggregate and coarse aggregate, respectively, when the sieve allowance is 36.8%. The particle size of the material is taken as the characteristic particle size.

(2)每立方米骨料空隙体积VPO (2) V PO per cubic meter of aggregate void volume

Figure RE-GDA0003050076270000061
Figure RE-GDA0003050076270000061

(3)单位体积骨料总表面积S(3) Total surface area S of aggregate per unit volume

Figure RE-GDA0003050076270000062
Figure RE-GDA0003050076270000062

Figure RE-GDA0003050076270000063
Figure RE-GDA0003050076270000063

Figure RE-GDA0003050076270000064
Figure RE-GDA0003050076270000064

其中，nS，nG分别为细骨料和粗骨料的理论数量。where n S and n G are the theoretical quantities of fine and coarse aggregates, respectively.

(4)单位体积骨料所需水泥浆的总体积VP (4) The total volume VP of cement slurry required per unit volume of aggregate

VP＝VPO+APT·SV P =V PO +APT·S

其中，APT为包裹在骨料表面的水泥浆体厚度，取APT＝5μm时可满足混凝土工作性能要求。Among them, APT is the thickness of the cement paste wrapped on the surface of the aggregate. When APT=5μm, it can meet the performance requirements of concrete.

(5)单位体积混合型再生粗骨料混凝土所需最小水泥浆总体积VP′(5) The minimum total volume of cement slurry V P ′ required for mixed recycled coarse aggregate concrete per unit volume

Figure RE-GDA0003050076270000065
Figure RE-GDA0003050076270000065

(6)单位体积混合型再生粗骨料混凝土所需最小水泥用量

Figure RE-GDA0003050076270000066
和最小用水量
Figure RE-GDA0003050076270000067
(6) Minimum cement dosage required per unit volume of mixed recycled coarse aggregate concrete
Figure RE-GDA0003050076270000066
and minimum water consumption
Figure RE-GDA0003050076270000067

Figure RE-GDA0003050076270000068
Figure RE-GDA0003050076270000068

Figure RE-GDA0003050076270000069
Figure RE-GDA0003050076270000069

其中，

Figure RE-GDA00030500762700000610
为混合型再生粗骨料混凝土水灰比。in,
Figure RE-GDA00030500762700000610
It is the water-cement ratio of mixed recycled coarse aggregate concrete.

本发明的有益效果是：根据本发明提出的混合型再生粗骨料混凝土配合比设计方法，可以明显改善混合型再生粗骨料混凝土中粗骨料分布的不均质性，提高混凝土抗压强度和弹性模量，减小混凝土干缩，混合型再生粗骨料混凝土性能的提升进一步推动其在实际工程中的推广应用。The beneficial effects of the present invention are: according to the mixing ratio design method of the mixed recycled coarse aggregate concrete proposed by the present invention, the inhomogeneity of the distribution of the coarse aggregate in the mixed recycled coarse aggregate concrete can be obviously improved, and the compressive strength of the concrete can be improved. and elastic modulus, reduce the dry shrinkage of concrete, and improve the performance of mixed recycled coarse aggregate concrete to further promote its popularization and application in practical engineering.

附图说明Description of drawings

下面结合附图和实施例对本发明进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

图1为干缩值随时间变化规律图；Figure 1 is a graph showing the variation law of dry shrinkage value with time;

图2为本发明适用于混合型再生粗骨料混凝土的配合比设计方法流程图。Fig. 2 is a flow chart of a mixing ratio design method suitable for mixed recycled coarse aggregate concrete according to the present invention.

具体实施方式Detailed ways

为使本发明的目的，技术方案及效果更加清楚，明确，举实例对本发明进一步详细说明。应当理解，此处所描述的具体实施仅用以解释本发明，并不用于限定本发明。In order to make the purpose, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail with examples. It should be understood that the specific implementations described herein are only used to explain the present invention, but not to limit the present invention.

本申请提供一种适用于混合型再生粗骨料混凝土的配合比设计方法，所述方法包括混合型再生粗骨料混凝土配合比设计中用水量、水泥用量、粗骨料、细骨料用量的确定，其特征在于，所述方法首先通过调整砂浆密度使砂浆密度与粗骨料各组分之间的密度差达到最小，从而降低硬化后混凝土中粗骨料分布的不均质性；然后结合等体积砂浆取代法和最小浆体理论计算用水量、水泥用量、粗骨料、细骨料用量，等体积砂浆取代法保证混合型再生粗骨料混凝土中新、旧砂浆总含量等于普通混凝土中砂浆含量，结合最小浆体理论则可以确保混合型再生粗骨料混凝土中水泥浆体含量能够达到满足混凝土性能所需的最小浆体含量。上述混合型再生粗骨料的成分包括天然粗骨料、再生混凝土粗骨料、再生碎砖粗骨料；所述天然粗骨料指的是天然石料经破碎筛分得到的粒径不大于31mm，符合颗粒级配的粗骨料；所述再生混凝土粗骨料指由建筑拆除废弃物中混凝土构件破碎筛分得到的粗骨料；所述再生碎砖粗骨料指由建筑拆除废弃物中烧结粘土砖破碎筛分得到的粗骨料。The present application provides a mixing ratio design method suitable for mixed recycled coarse aggregate concrete. The method comprises the following steps: Determine, characterized in that, the method first adjusts the density of the mortar to minimize the density difference between the mortar density and each component of the coarse aggregate, thereby reducing the inhomogeneity of the distribution of the coarse aggregate in the hardened concrete; and then combining Equal volume mortar replacement method and minimum slurry theoretical calculation of water consumption, cement consumption, coarse aggregate and fine aggregate consumption. The equal volume mortar replacement method ensures that the total content of new and old mortar in mixed recycled coarse aggregate concrete is equal to that of ordinary concrete. The mortar content, combined with the minimum slurry theory, can ensure that the cement slurry content in the mixed recycled coarse aggregate concrete can reach the minimum slurry content required to meet the performance of the concrete. The components of the above-mentioned mixed-type recycled coarse aggregate include natural coarse aggregate, recycled concrete coarse aggregate, and recycled broken brick coarse aggregate; the natural coarse aggregate refers to the particle size obtained by crushing and sieving the natural stone not greater than 31mm. , the coarse aggregate that conforms to the particle gradation; the recycled concrete coarse aggregate refers to the coarse aggregate obtained by crushing and screening of concrete components in the construction demolition waste; the recycled brick coarse aggregate refers to the coarse aggregate obtained from the construction demolition waste Coarse aggregate obtained by crushing and screening of sintered clay bricks.

所述混合型再生粗骨料混凝土配合比设计方法计算步骤如下：The calculation steps of the mixed-type recycled coarse aggregate concrete mix proportion design method are as follows:

步骤一：确定混合型再生粗骨料混凝土水泥砂浆密度；所述混合型再生粗骨料混凝土水泥砂浆密度计算过程如下：Step 1: Determine the density of the mixed-type recycled coarse aggregate concrete cement mortar; the calculation process of the mixed-type recycled coarse aggregate concrete cement mortar density is as follows:

步骤1.1，试验测定混合型再生粗骨料中天然粗骨料、再生混凝土粗骨料和再生碎砖粗骨料的体积占比Step 1.1, test to determine the volume ratio of natural coarse aggregate, recycled concrete coarse aggregate and recycled brick coarse aggregate in the mixed recycled coarse aggregate

Figure RE-GDA0003050076270000071
Figure RE-GDA0003050076270000071

其中，

Figure RE-GDA0003050076270000072
为每立方米混合型再生粗骨料混凝土中天然粗骨料的体积；
Figure RE-GDA0003050076270000073
为每立方米混合型再生粗骨料混凝土中再生混凝土粗骨料的体积；
Figure RE-GDA0003050076270000074
为每立方米混合型再生粗骨料混凝土中再生碎砖粗骨料的体积。in,
Figure RE-GDA0003050076270000072
is the volume of natural coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000073
is the volume of recycled concrete coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000074
It is the volume of recycled crushed brick coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete.

步骤1.2，计算砂浆密度Step 1.2, Calculate Mortar Density

Figure RE-GDA0003050076270000081
Figure RE-GDA0003050076270000081

其中，ρNA为天然粗骨料饱和面干密度；ρRCA为再生混凝土粗骨料饱和面干密度；ρRBA为再生碎砖粗骨料饱和面干密度；

Figure RE-GDA0003050076270000082
为混合型再生粗骨料混凝土中水泥砂浆密度。Among them, ρ NA is the saturated surface dry density of natural coarse aggregate; ρ RCA is the saturated surface dry density of recycled concrete coarse aggregate; ρ RBA is the saturated surface dry density of recycled broken brick coarse aggregate;
Figure RE-GDA0003050076270000082
is the density of cement mortar in mixed recycled coarse aggregate concrete.

步骤二：计算普通混凝土水泥砂浆体积；所述普通混凝土水泥砂浆体积计算过程如下：Step 2: Calculate the volume of ordinary concrete cement mortar; the calculation process of the ordinary concrete cement mortar volume is as follows:

步骤2.1，每立方米混凝土体积Step 2.1, volume of concrete per cubic meter

Figure RE-GDA0003050076270000083
Figure RE-GDA0003050076270000083

其中，VNC为普通混凝土体积；

Figure RE-GDA0003050076270000084
为每立方米普通混凝土水泥用量；
Figure RE-GDA0003050076270000085
为每立方米普通混凝土天然粗骨料用量；
Figure RE-GDA0003050076270000086
为每立方米普通混凝土细骨料用量；ρc为水泥密度，应按《水泥密度测定方法》GB/T 208测定，也可取2900kg/m3～3100kg/m3；ρs为细骨料的表观密度，应按照现行行业标准《普通混凝土用砂、石质量及检验方法标准》JGJ 52测定；ρw为水的密度，可取1000kg/m3；α为混凝土的含气量百分数，在不使用引气型外加剂时，可取为1。Among them, V NC is the volume of ordinary concrete;
Figure RE-GDA0003050076270000084
It is the amount of cement per cubic meter of ordinary concrete;
Figure RE-GDA0003050076270000085
It is the amount of natural coarse aggregate per cubic meter of ordinary concrete;
Figure RE-GDA0003050076270000086
is the amount of fine aggregate per cubic meter of ordinary concrete; ρ c is the cement density, which should be determined according to the "Determination of Cement Density" GB/T 208, or 2900kg/m 3 ~ 3100kg/m 3 ; ρ s is the amount of fine aggregate Apparent density should be determined in accordance with the current industry standard "Standards for quality and inspection methods of sand and stone for ordinary concrete" JGJ 52; ρw is the density of water, which can be 1000kg/m 3 ; α is the percentage of air content of concrete, which is not used For air-entraining admixtures, it can be taken as 1.

步骤2.2，普通混凝土砂率Step 2.2, Ordinary Concrete Sand Rate

Figure RE-GDA0003050076270000087
Figure RE-GDA0003050076270000087

式中，

Figure RE-GDA0003050076270000088
为普通混凝土砂率；In the formula,
Figure RE-GDA0003050076270000088
is the sand rate of ordinary concrete;

步骤2.3，每立方米混凝土中水泥砂浆体积Step 2.3, cement mortar volume per cubic meter of concrete

Figure RE-GDA0003050076270000089
Figure RE-GDA0003050076270000089

步骤三：结合等体积砂浆取代法确定混合型再生粗骨料混凝土中新拌水泥砂浆体积；所述混合型再生粗骨料混凝土中新拌水泥砂浆体积计算过程如下：Step 3: Determine the volume of freshly mixed cement mortar in the mixed recycled coarse aggregate concrete in combination with the equal volume mortar replacement method; the calculation process of the freshly mixed cement mortar volume in the mixed recycled coarse aggregate concrete is as follows:

步骤3.1，试验测定再生混凝土粗骨料和再生碎砖粗骨料表面黏附旧砂浆含量Step 3.1, test to determine the content of old mortar adhered to the surface of recycled concrete coarse aggregate and recycled broken brick coarse aggregate

Figure RE-GDA00030500762700000810
Figure RE-GDA00030500762700000810

Figure RE-GDA00030500762700000811
Figure RE-GDA00030500762700000811

其中，OMCRCA为再生混凝土粗骨料表面黏附旧砂浆含量；OMCRBA为再生碎砖粗骨料表面黏附旧砂浆含量；mRCA为去除旧砂浆前再生混凝土粗骨料绝干质量；mONA为去除旧砂浆后再生混凝土粗骨料中粒径大于4.75mm成分绝干质量；mRBA为去除旧砂浆前再生碎砖粗骨料绝干质量；mOBA为去除旧砂浆后再生碎砖粗骨料中粒径大于4.75mm成分绝干质量。Among them, OMC RCA is the content of the old mortar adhered to the surface of the recycled concrete coarse aggregate; OMC RBA is the content of the old mortar adhered to the surface of the recycled brick coarse aggregate; mRCA is the dry mass of the recycled concrete coarse aggregate before removing the old mortar; m ONA is the The absolute dry mass of the recycled concrete coarse aggregate with a particle size larger than 4.75mm after removing the old mortar; m RBA is the absolute dry mass of the recycled brick coarse aggregate before the old mortar is removed; m OBA is the recycled brick coarse aggregate after the old mortar is removed The absolute dry mass of the medium particle size greater than 4.75mm.

步骤3.2，每立方米混合型再生粗骨料混凝土中天然骨料、再生混凝土粗骨料、再生碎砖粗骨料体积Step 3.2, the volume of natural aggregate, recycled concrete coarse aggregate, and recycled crushed brick coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete

Figure RE-GDA0003050076270000091
Figure RE-GDA0003050076270000091

Figure RE-GDA0003050076270000092
Figure RE-GDA0003050076270000092

Figure RE-GDA0003050076270000093
Figure RE-GDA0003050076270000093

Figure RE-GDA0003050076270000094
Figure RE-GDA0003050076270000094

其中，

Figure RE-GDA0003050076270000095
为普通混凝土中粗骨料体积；ρONA为去除黏附砂浆的再生混凝土粗骨料饱和面干密度；ρOBA为去除黏附砂浆的再生碎砖粗骨料饱和面干密度；in,
Figure RE-GDA0003050076270000095
is the volume of coarse aggregate in ordinary concrete; ρ ONA is the saturated surface dry density of the recycled concrete coarse aggregate with the adhesive mortar removed; ρ OBA is the saturated surface dry density of the recycled brick coarse aggregate with the adhesive mortar removed;

步骤3.3，每立方米混合型再生粗骨料混凝土中旧砂浆体积Step 3.3, volume of old mortar in mixed recycled coarse aggregate concrete per cubic meter

Figure RE-GDA0003050076270000096
Figure RE-GDA0003050076270000096

其中，

Figure RE-GDA0003050076270000097
为每立方米混合型再生粗骨料混凝土中旧砂浆的体积；in,
Figure RE-GDA0003050076270000097
is the volume of old mortar per cubic meter of mixed recycled coarse aggregate concrete;

步骤3.4，每立方米混合型再生粗骨料混凝土中新拌砂浆体积Step 3.4, fresh mortar volume per cubic meter of mixed recycled coarse aggregate concrete

Figure RE-GDA0003050076270000098
Figure RE-GDA0003050076270000098

其中，

Figure RE-GDA0003050076270000099
为每立方米混合型再生粗骨料混凝土中旧砂浆的体积；in,
Figure RE-GDA0003050076270000099
is the volume of old mortar per cubic meter of mixed recycled coarse aggregate concrete;

步骤3.5，每立方米混合型再生粗骨料混凝土各组分用量Step 3.5, the amount of each component of mixed recycled coarse aggregate concrete per cubic meter

Figure RE-GDA00030500762700000910
Figure RE-GDA00030500762700000910

Figure RE-GDA0003050076270000101
Figure RE-GDA0003050076270000101

Figure RE-GDA0003050076270000102
Figure RE-GDA0003050076270000102

Figure RE-GDA0003050076270000103
Figure RE-GDA0003050076270000103

Figure RE-GDA0003050076270000104
Figure RE-GDA0003050076270000104

Figure RE-GDA0003050076270000105
Figure RE-GDA0003050076270000105

其中，

Figure RE-GDA0003050076270000106
为每立方米混合型再生粗骨料混凝土用水量；
Figure RE-GDA0003050076270000107
为每立方米混合型再生粗骨料混凝土水泥用量；
Figure RE-GDA0003050076270000108
为每立方米混合型再生粗骨料混凝土天然粗骨料用量；
Figure RE-GDA0003050076270000109
为每立方米混合型再生粗骨料混凝土再生混凝土粗骨料用量；
Figure RE-GDA00030500762700001010
为每立方米混合型再生粗骨料混凝土再生碎砖粗骨料用量；
Figure RE-GDA00030500762700001011
为每立方米混合型再生粗骨料混凝土天然粗骨料用量；
Figure RE-GDA00030500762700001012
为天然粗骨料自然状态下含水率；
Figure RE-GDA00030500762700001013
为天然粗骨料饱和面干状态吸水率；
Figure RE-GDA00030500762700001014
为再生混凝土粗骨料自然状态下含水率；
Figure RE-GDA00030500762700001015
为再生混凝土粗骨料饱和面干状态吸水率；
Figure RE-GDA00030500762700001016
为再生碎砖粗骨料自然状态下含水率；
Figure RE-GDA00030500762700001017
为再生碎砖粗骨料饱和面干状态吸水率。in,
Figure RE-GDA0003050076270000106
is the water consumption per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000107
is the amount of cement per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000108
It is the amount of natural coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA0003050076270000109
It is the amount of recycled concrete coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA00030500762700001010
For each cubic meter of mixed recycled coarse aggregate concrete recycled broken brick coarse aggregate dosage;
Figure RE-GDA00030500762700001011
It is the amount of natural coarse aggregate per cubic meter of mixed recycled coarse aggregate concrete;
Figure RE-GDA00030500762700001012
It is the moisture content of natural coarse aggregate in its natural state;
Figure RE-GDA00030500762700001013
It is the water absorption rate of natural coarse aggregate saturated surface dry state;
Figure RE-GDA00030500762700001014
It is the moisture content of recycled concrete coarse aggregate in natural state;
Figure RE-GDA00030500762700001015
is the water absorption rate of the saturated surface of the recycled concrete coarse aggregate in the dry state;
Figure RE-GDA00030500762700001016
It is the moisture content of the coarse aggregate of recycled broken bricks in the natural state;
Figure RE-GDA00030500762700001017
It is the water absorption rate of the saturated surface dry state of the coarse aggregate of recycled broken bricks.

步骤四：计算用水量

Figure RE-GDA00030500762700001018
水泥用量
Figure RE-GDA00030500762700001019
粗骨料，细骨料用量；所述混合型再生粗骨料混凝土最小用水量和最小水泥用量计算过程如下：Step 4: Calculate water consumption
Figure RE-GDA00030500762700001018
cement consumption
Figure RE-GDA00030500762700001019
The amount of coarse aggregate and fine aggregate; the calculation process of the minimum water consumption and the minimum cement consumption of the mixed recycled coarse aggregate concrete is as follows:

步骤4.1，骨料堆积度

Figure RE-GDA00030500762700001020
Step 4.1, Aggregate Packing Degree
Figure RE-GDA00030500762700001020

Figure RE-GDA00030500762700001021
Figure RE-GDA00030500762700001021

Figure RE-GDA00030500762700001022
Figure RE-GDA00030500762700001022

Figure RE-GDA00030500762700001023
Figure RE-GDA00030500762700001023

Figure RE-GDA00030500762700001024
Figure RE-GDA00030500762700001024

Figure RE-GDA0003050076270000111
Figure RE-GDA0003050076270000111

Figure RE-GDA0003050076270000112
Figure RE-GDA0003050076270000112

yS+yG＝1y S +y G =1

其中，yS和yG分别为细骨料和粗骨料的体积分数；kD为决定粗细骨料直径比影响的因子； ks为一个统计因子；x为细骨料堆积体积与粗骨料空隙体积之间的比值；x0＝0.4753，k0＝0.3881；φST，φGT分别为细骨料和粗骨料的特征堆积度；ρST，ρGT为细骨料和粗骨料的堆积密度；ρS，ρG分别为细骨料和粗骨料的颗粒密度；dST，dGT分别为细骨料和粗骨料的特征粒径，可取余量为36.8％时骨料的粒径作为特征粒径。；Among them, y S and y G are the volume fractions of fine aggregate and coarse aggregate, respectively; k D is a factor that determines the influence of the ratio of coarse to fine aggregate diameter; k s is a statistical factor; The ratio between the void volumes of the aggregates; x 0 =0.4753, k 0 =0.3881; φ ST , φ GT are the characteristic packing degrees of fine aggregate and coarse aggregate, respectively; ρ ST , ρ GT are fine aggregate and coarse aggregate ρ S , ρ G are the particle densities of fine aggregate and coarse aggregate, respectively; d ST , d GT are the characteristic particle size of fine aggregate and coarse aggregate, respectively. The particle size is taken as the characteristic particle size. ;

步骤4.2，每立方米骨料空隙体积VPO Step 4.2, V PO per cubic meter of aggregate void volume

Figure RE-GDA0003050076270000113
Figure RE-GDA0003050076270000113

步骤4.3，单位体积骨料总表面积SStep 4.3, Total surface area S per unit volume of aggregate

Figure RE-GDA0003050076270000114
Figure RE-GDA0003050076270000114

Figure RE-GDA0003050076270000115
Figure RE-GDA0003050076270000115

Figure RE-GDA0003050076270000116
Figure RE-GDA0003050076270000116

其中，nS，nG分别为细骨料和粗骨料的理论数量；where n S and n G are the theoretical quantities of fine and coarse aggregates, respectively;

步骤4.4，单位体积骨料所需水泥浆的总体积VP Step 4.4, the total volume of cement slurry VP required per unit volume of aggregate

VP＝VPO+APT·SV P =V PO +APT·S

其中，APT为包裹在骨料表面的水泥浆体厚；取APT＝5μm时可满足混凝土工作性能要求。Among them, APT is the thickness of the cement paste wrapped on the surface of the aggregate; when APT = 5 μm, it can meet the performance requirements of concrete.

步骤4.5，单位体积混合型再生粗骨料混凝土所需最小水泥浆总体积V′P Step 4.5, the minimum total volume of cement slurry V′ P required per unit volume of mixed recycled coarse aggregate concrete

Figure RE-GDA0003050076270000117
Figure RE-GDA0003050076270000117

步骤4.6，单位体积混合型再生粗骨料混凝土所需最小水泥用量

Figure RE-GDA0003050076270000118
和最小用水量
Figure RE-GDA0003050076270000119
Step 4.6, the minimum amount of cement required per unit volume of mixed recycled coarse aggregate concrete
Figure RE-GDA0003050076270000118
and minimum water consumption
Figure RE-GDA0003050076270000119

Figure RE-GDA0003050076270000121
Figure RE-GDA0003050076270000121

Figure RE-GDA0003050076270000122
Figure RE-GDA0003050076270000122

其中，

Figure RE-GDA0003050076270000123
为混合型再生粗骨料混凝土水灰比。in,
Figure RE-GDA0003050076270000123
It is the water-cement ratio of mixed recycled coarse aggregate concrete.

步骤五：利用最小浆体理论，根据粗骨料、细骨料用量计算混合型再生粗骨料混凝土所需的最小浆体含量，进一步计算最小水泥用量

Figure RE-GDA0003050076270000124
以及最小用水量
Figure RE-GDA0003050076270000125
Step 5: Using the minimum slurry theory, calculate the minimum slurry content required for the mixed recycled coarse aggregate concrete according to the amount of coarse aggregate and fine aggregate, and further calculate the minimum cement dosage
Figure RE-GDA0003050076270000124
and minimum water consumption
Figure RE-GDA0003050076270000125

步骤六：若

Figure RE-GDA0003050076270000126
则水泥用量取
Figure RE-GDA0003050076270000127
用水量取
Figure RE-GDA0003050076270000128
若
Figure RE-GDA0003050076270000129
则水泥用量取
Figure RE-GDA00030500762700001210
用水量取
Figure RE-GDA00030500762700001211
Step 6: If
Figure RE-GDA0003050076270000126
The amount of cement used is
Figure RE-GDA0003050076270000127
water consumption
Figure RE-GDA0003050076270000128
like
Figure RE-GDA0003050076270000129
The amount of cement used is
Figure RE-GDA00030500762700001210
water consumption
Figure RE-GDA00030500762700001211

根据本发明提出的混合型再生粗骨料混凝土配合比设计方法，可以明显改善混合型再生粗骨料混凝土中粗骨料分布的不均质性，提高混凝土抗压强度和弹性模量，减小混凝土干缩，混合型再生粗骨料混凝土性能的提升进一步推动其在实际工程中的推广应用。According to the mixing ratio design method of the mixed recycled coarse aggregate concrete proposed in the present invention, the heterogeneity of the distribution of the coarse aggregate in the mixed recycled coarse aggregate concrete can be obviously improved, the compressive strength and elastic modulus of the concrete can be improved, and the The drying shrinkage of concrete and the improvement of the performance of mixed recycled coarse aggregate concrete further promote its popularization and application in practical engineering.

实施例1Example 1

试验共浇筑六组混凝土，其中两组普通混凝土(NC0.5、NC0.65)，普通混凝土所用粗骨料全部为天然粗骨料，四组混合型再生粗骨料混凝土(MRC0.5C、MRC0.65C、MRC0.5N、MRC0.65N)，混合型再生粗骨料混凝土所用粗骨料中天然粗骨料、再生混凝土粗骨料、再生碎砖粗骨料体积占比分别为0.5、0.25、0.25。MRC0.5C和MRC0.65C配合比设计采用普通混凝土配合比计算方法，MRC0.5N和MRC0.65N配合比设计采用本发明提出的适用于混合型再生粗骨料混凝土的配合比计算方法。六组混凝土的配合比如表1所示，根据本发明提出的配合比计算设计方法计算所得混凝土MRC0.5N的

Figure RE-GDA00030500762700001212
和
Figure RE-GDA00030500762700001213
分别为310kg/m3和320kg/m3，故水泥用量和用水量取320kg/m3和160kg/m3；混凝土MRC0.65的
Figure RE-GDA00030500762700001214
Figure RE-GDA00030500762700001215
Figure RE-GDA00030500762700001216
分别为239kg/m3和271kg/m3，故水泥用量和用水量取271kg/m3和176kg/m3。A total of six groups of concrete were poured in the test, of which two groups of ordinary concrete (NC0.5, NC0.65), the coarse aggregates used in ordinary concrete are all natural coarse aggregates, and four groups of mixed recycled coarse aggregate concrete (MRC0.5C, MRC0 .65C, MRC0.5N, MRC0.65N), the volume proportions of natural coarse aggregate, recycled concrete coarse aggregate, and recycled broken brick coarse aggregate in the coarse aggregate used in mixed recycled coarse aggregate concrete are 0.5, 0.25, 0.25. The mixing ratio design of MRC0.5C and MRC0.65C adopts the calculation method of ordinary concrete mix ratio, and the mixing ratio design of MRC0.5N and MRC0.65N adopts the mixing ratio calculation method suitable for mixed recycled coarse aggregate concrete proposed by the present invention. The mixing ratios of the six groups of concrete are shown in Table 1. According to the mixing ratio calculation and design method proposed by the present invention, the MRC0.5N of the obtained concrete is calculated.
Figure RE-GDA00030500762700001212
and
Figure RE-GDA00030500762700001213
are 310kg/m 3 and 320kg/m 3 respectively, so the cement consumption and water consumption are 320kg/m 3 and 160kg/m 3 ; the concrete MRC is 0.65
Figure RE-GDA00030500762700001214
Figure RE-GDA00030500762700001215
Figure RE-GDA00030500762700001216
They are 239kg/m 3 and 271kg/m 3 respectively, so the cement consumption and water consumption are 271kg/m 3 and 176kg/m 3 .

表2混凝土配合比Table 2 Concrete mix ratio

Figure RE-GDA00030500762700001217
Figure RE-GDA00030500762700001217

注：NA-普通粗骨料，RCA-再生混凝土粗骨料，RBA-碎砖粗骨料Note: NA - ordinary coarse aggregate, RCA - recycled concrete coarse aggregate, RBA - broken brick coarse aggregate

在六组混凝土28天龄期时测定其立方体抗压强度和弹性模量(如表1所示)，MRC0.5N和 MRC0.65N与MRC0.5C和MRC0.65C相比立方体抗压强度分别增长5％和4％，弹性模量分别增长22.8％和33.5％。The cubic compressive strength and elastic modulus of six groups of concrete were measured at 28 days of age (as shown in Table 1), and the cubic compressive strength of MRC0.5N and MRC0.65N increased compared with MRC0.5C and MRC0.65C, respectively 5% and 4%, the elastic modulus increased by 22.8% and 33.5%, respectively.

可利用不均匀性指数VI来反映混凝土粗骨料分布的均质性，VI越大代表粗骨料分布越不均匀； MRC0.5N、MRC0.65N、MRC0.5C、MRC0.65C的VI值分别为5.95％、10.68％、14.45％、39.12％。试验结果表明本发明提出的配合比设计方法可明显改善混合型再生粗骨料混凝土分布的不均质性。The inhomogeneity index VI can be used to reflect the homogeneity of the distribution of coarse aggregate in concrete. The larger the VI, the more uneven the distribution of coarse aggregate. The VI values of MRC0.5N, MRC0.65N, MRC0.5C, and MRC0.65C are respectively were 5.95%, 10.68%, 14.45%, and 39.12%. The test results show that the mixing ratio design method proposed by the present invention can obviously improve the inhomogeneity of the mixed-type recycled coarse aggregate concrete distribution.

浇筑24h脱模后将六组尺寸为100mm×100mm×515mm的试块放在恒温恒湿房间内观测其干缩情况，随着天数的增加，六组混凝土试块的干缩变化规律如图1所示。由图1可以看出随着时间的增加，MRC0.5N和MRC0.65N的干缩值明显小于MRC0.5C和MRC0.65C。After 24 hours of pouring and demoulding, six groups of test blocks with a size of 100mm × 100mm × 515mm were placed in a constant temperature and humidity room to observe their drying shrinkage. shown. It can be seen from Figure 1 that with the increase of time, the dry shrinkage values of MRC0.5N and MRC0.65N are significantly smaller than that of MRC0.5C and MRC0.65C.

对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽范围。The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A mix proportion design method suitable for mixed type recycled coarse aggregate concrete comprises the determination of water consumption, cement usage, coarse aggregate and fine aggregate usage in the mix proportion design of the mixed type recycled coarse aggregate concrete, and is characterized in that the method firstly minimizes the density difference between mortar density and each component of the coarse aggregate by adjusting the mortar density, thereby reducing the inhomogeneity of the coarse aggregate distribution in the hardened concrete; and then calculating the water consumption, the cement consumption, the coarse aggregate and the fine aggregate consumption by combining an isometric mortar substitution method and a minimum slurry theory, wherein the isometric mortar substitution method ensures that the total content of new mortar and old mortar in the mixed type recycled coarse aggregate concrete is equal to the mortar content in common concrete, and the minimum slurry theory ensures that the cement slurry content in the mixed type recycled coarse aggregate concrete can reach the minimum slurry content required by meeting the concrete performance.
2. The mix proportion design method for the mixed type recycled coarse aggregate concrete according to claim 1, wherein the components of the mixed type recycled coarse aggregate comprise natural coarse aggregate, recycled concrete coarse aggregate and recycled broken brick coarse aggregate.
3. The mix proportion design method for the mixed recycled coarse aggregate concrete as claimed in claim 2, wherein the natural coarse aggregate is coarse aggregate which is obtained by crushing and screening natural stone and has a grain size of not more than 31mm and meets the grain composition.
4. The mix proportion design method for the mixed type recycled coarse aggregate concrete according to claim 2, wherein the recycled concrete coarse aggregate is coarse aggregate obtained by crushing and screening concrete members in construction demolition waste.
5. The mix proportion design method suitable for the mixed type recycled coarse aggregate concrete according to claim 2, wherein the recycled broken brick coarse aggregate refers to coarse aggregate obtained by crushing and screening sintered clay bricks in construction demolition waste.
6. The mix proportion design method suitable for the mixed type recycled coarse aggregate concrete according to claim 1, wherein the mix proportion design method of the mixed type recycled coarse aggregate concrete comprises the following calculation steps:
the method comprises the following steps: determining the density of the mixed recycled coarse aggregate concrete cement mortar;
step two: calculating the volume of the common concrete cement mortar;
step three: determining the volume of newly-mixed cement mortar in the mixed type recycled coarse aggregate concrete by combining an isometric mortar substitution method;
step four: calculating water consumption
Figure FDA0002808464740000011
Amount of cement used
Figure FDA0002808464740000012
The dosage of coarse aggregate and fine aggregate;
step five: calculating the minimum slurry content required by the mixed type recycled coarse aggregate concrete according to the use amounts of the coarse aggregate and the fine aggregate by using a minimum slurry theory, and further calculating the use amount of the minimum cement
Figure FDA0002808464740000013
And minimum water usage
Figure FDA0002808464740000014
Step six: if it is
Figure FDA0002808464740000015
The amount of cement is taken
Figure FDA0002808464740000016
Measuring with water
Figure FDA0002808464740000017
If it is
Figure FDA0002808464740000018
The amount of cement is taken
Figure FDA0002808464740000019
Measuring with water
Figure FDA00028084647400000110
7. The mix proportion design method suitable for the mixed type recycled coarse aggregate concrete according to claim 6, wherein the mixed type recycled coarse aggregate concrete cement mortar density is calculated by the following steps:
step 1.1, testing and determining the volume ratio of natural coarse aggregate, recycled concrete coarse aggregate and recycled broken brick coarse aggregate in the mixed recycled coarse aggregate
Figure FDA0002808464740000021
Wherein,
Figure FDA0002808464740000022
is the volume of natural coarse aggregate in each cubic meter of mixed recycled coarse aggregate concrete;
Figure FDA0002808464740000023
the volume of the recycled concrete coarse aggregate in each cubic meter of the mixed recycled coarse aggregate concrete;
Figure FDA0002808464740000024
is the volume of the recycled broken brick coarse aggregate in each cubic meter of the mixed recycled coarse aggregate concrete.
Step 1.2, calculating the mortar density
Figure FDA0002808464740000025
Where ρ isNAIs the saturated surface dry density of the natural coarse aggregate; rhoRCAThe dry density of the saturated surface of the recycled concrete coarse aggregate; rhoRBAFor regeneration ofThe dry density of the saturated surface of the broken brick coarse aggregate;
Figure FDA0002808464740000026
the density of the cement mortar in the mixed recycled coarse aggregate concrete is shown.
8. The mix proportion design method suitable for the mixed type recycled coarse aggregate concrete according to claim 6, wherein the calculation process of the volume of the ordinary concrete cement mortar is as follows:
step 2.1, volume of concrete per cubic meter
Figure FDA0002808464740000027
Wherein, VNCIs the volume of common concrete;
Figure FDA0002808464740000028
the dosage of the common concrete cement is per cubic meter;
Figure FDA0002808464740000029
the consumption of the natural coarse aggregate of the common concrete per cubic meter;
Figure FDA00028084647400000210
the dosage of the common concrete fine aggregate per cubic meter; rhocThe cement density is measured according to national standards; rhosThe apparent density of the fine aggregate is measured according to the industry standard; rhowIs the density of water; alpha is the percentage of the gas content of the concrete;
step 2.2, ordinary concrete sand rate
Figure FDA00028084647400000211
In the formula,
Figure FDA00028084647400000212
the sand rate of common concrete is adopted;
step 2.3, the volume of cement mortar in each cubic meter of concrete
Figure FDA00028084647400000213
9. The mix proportion design method suitable for the mixed type recycled coarse aggregate concrete according to claim 6, wherein the volume of the fresh cement mortar in the mixed type recycled coarse aggregate concrete is calculated as follows:
step 3.1, testing and determining the content of old mortar adhered to the surfaces of the recycled concrete coarse aggregate and the recycled broken brick coarse aggregate
Figure FDA0002808464740000031
Figure FDA0002808464740000032
Wherein, OMCRCAThe content of old mortar adhered to the surface of the recycled concrete coarse aggregate; OMCRBAThe content of old mortar adhered to the surface of the coarse aggregate of the recycled broken brick; m isRCAThe quality of the regenerated concrete coarse aggregate is absolutely dry before removing old mortar; m isONAThe oven-dry mass of the components with the grain diameter larger than 4.75mm in the recycled concrete coarse aggregate after the old mortar is removed; m isRBAThe oven-dried quality of the recycled broken brick coarse aggregate before removing the old mortar is realized; m isOBAThe oven-dry quality of the components with the particle size larger than 4.75mm in the coarse aggregate of the recycled broken brick after old mortar is removed.
Step 3.2, the volumes of the natural aggregate, the recycled concrete coarse aggregate and the recycled broken brick coarse aggregate in each cubic meter of mixed recycled coarse aggregate concrete
Figure FDA0002808464740000033
Figure FDA0002808464740000034
Figure FDA0002808464740000035
Figure FDA0002808464740000036
Wherein,
Figure FDA0002808464740000037
is the volume of the coarse aggregate in the common concrete; rhoONARemoving the saturated surface dry density of the recycled concrete coarse aggregate adhered with the mortar; rhoOBARemoving the saturated surface dry density of the coarse aggregate of the recycled broken bricks adhered with the mortar;
step 3.3, the volume of the used mortar in each cubic meter of mixed recycled coarse aggregate concrete
Figure FDA0002808464740000038
Wherein,
Figure FDA0002808464740000039
the volume of the old mortar in each cubic meter of the mixed recycled coarse aggregate concrete;
step 3.4, the volume of the fresh mortar in each cubic meter of mixed recycled coarse aggregate concrete
Figure FDA00028084647400000310
Wherein,
Figure FDA00028084647400000311
the volume of the old mortar in each cubic meter of the mixed recycled coarse aggregate concrete;
step 3.5, the dosage of each component of the mixed recycled coarse aggregate concrete per cubic meter
Figure FDA0002808464740000041
Figure FDA0002808464740000042
Figure FDA0002808464740000043
Figure FDA0002808464740000044
Figure FDA0002808464740000045
Figure FDA0002808464740000046
Wherein,
Figure FDA0002808464740000047
the water consumption is per cubic meter of the mixed recycled coarse aggregate concrete;
Figure FDA0002808464740000048
the dosage of the mixed recycled coarse aggregate concrete cement per cubic meter is;
Figure FDA0002808464740000049
the dosage of the natural coarse aggregate of the mixed type recycled coarse aggregate concrete per cubic meter;
Figure FDA00028084647400000410
the dosage of the coarse aggregate of the recycled concrete is the mixed recycled coarse aggregate concrete per cubic meter;
Figure FDA00028084647400000411
the consumption of the coarse aggregate of the regenerated broken brick of the mixed type regenerated coarse aggregate concrete per cubic meter;
Figure FDA00028084647400000412
the dosage of the natural coarse aggregate of the mixed type recycled coarse aggregate concrete per cubic meter;
Figure FDA00028084647400000413
is the water content of the natural coarse aggregate in the natural state;
Figure FDA00028084647400000414
the water absorption rate is in a saturated surface dry state of the natural coarse aggregate;
Figure FDA00028084647400000415
the water content of the recycled concrete coarse aggregate in a natural state is obtained;
Figure FDA00028084647400000416
the water absorption rate is the dry state water absorption rate of a saturated surface of the recycled concrete coarse aggregate;
Figure FDA00028084647400000417
the water content of the recycled broken brick coarse aggregate in a natural state;
Figure FDA00028084647400000418
is the water absorption of the recycled broken brick coarse aggregate in a saturated surface dry state.
10. The mix proportion design method suitable for the mixed type recycled coarse aggregate concrete according to claim 6, wherein the calculation process of the minimum water consumption and the minimum cement consumption of the mixed type recycled coarse aggregate concrete is as follows:
step 4.1, aggregate bulk density
Figure FDA00028084647400000419
Figure FDA00028084647400000420
Figure FDA00028084647400000421
Figure FDA00028084647400000422
Figure FDA00028084647400000423
Figure FDA0002808464740000051
Figure FDA0002808464740000052
yS+yG＝1
Wherein, ySAnd yGThe volume fractions of the fine aggregate and the coarse aggregate are respectively; k is a radical ofDDetermining the factor of the diameter ratio influence of the coarse and fine aggregates; k is a radical ofsIs a statistical factor; x is the fine aggregate bulk and coarse aggregateThe ratio between the void volumes; x is the number of0＝0.4753，k0＝0.3881；φST，φGTCharacteristic stacking degrees of fine aggregate and coarse aggregate respectively; rhoST，ρGTThe bulk density of the fine aggregate and the coarse aggregate; rhoS，ρGThe particle densities of the fine aggregate and the coarse aggregate respectively; dST，dGTThe characteristic particle sizes of the fine aggregate and the coarse aggregate are respectively;
step 4.2, void volume V of aggregate per cubic meterPO
Figure FDA0002808464740000053
Step 4.3, Total surface area S of aggregate per unit volume
Figure FDA0002808464740000054
Figure FDA0002808464740000055
Figure FDA0002808464740000056
Wherein n isS，nGThe theoretical amounts of fine aggregate and coarse aggregate, respectively;
step 4.4, Total volume V of Cement paste required by Unit volume of aggregateP
VP＝VPO+APT·S
Wherein, the APT is the thickness of the cement paste wrapped on the surface of the aggregate;
step 4.5, the total volume V 'of the minimum cement paste required by the unit volume mixed type recycled coarse aggregate concrete'P
Figure FDA0002808464740000057
Step 4.6, minimum cement dosage required by unit volume mixed type recycled coarse aggregate concrete
Figure FDA0002808464740000058
And minimum water usage
Figure FDA0002808464740000059
Figure FDA00028084647400000510
Figure FDA0002808464740000061
Wherein,
Figure FDA0002808464740000062
the water cement ratio of the mixed recycled coarse aggregate concrete is obtained.
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