CN105819735A - Polymer in-situ toughened cement base material and preparation method thereof - Google Patents
Polymer in-situ toughened cement base material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 82
- 239000004568 cement Substances 0.000 title claims abstract description 78
- 229920000642 polymer Polymers 0.000 title claims abstract description 32
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 45
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 24
- 239000013530 defoamer Substances 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000004816 latex Substances 0.000 claims abstract description 16
- 229920000126 latex Polymers 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 44
- 239000000203 mixture Substances 0.000 claims description 10
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical group [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 8
- 239000004281 calcium formate Substances 0.000 claims description 8
- 229940044172 calcium formate Drugs 0.000 claims description 8
- 235000019255 calcium formate Nutrition 0.000 claims description 8
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical group CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 7
- 238000006136 alcoholysis reaction Methods 0.000 claims description 7
- 229920001038 ethylene copolymer Polymers 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 230000014509 gene expression Effects 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 claims 1
- 229920002689 polyvinyl acetate Polymers 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 229940117958 vinyl acetate Drugs 0.000 claims 1
- 239000004566 building material Substances 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 12
- 239000000835 fiber Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000004567 concrete Substances 0.000 description 6
- 229920005646 polycarboxylate Polymers 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 229920006254 polymer film Polymers 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000006072 paste Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明属建筑材料技术领域，具体涉及一种聚合物原位增韧水泥基材料及其制备方法。本发明中用于水泥基材料增韧的原材料为：聚乙烯醇、乳胶粉、高效减水剂、消泡剂及早强剂。本发明根据实际需求，将上述原材料按一定比例量取后，溶解于拌合水中，再将水泥和集料加入到拌合水中进行混合搅拌即得流动性好、工作性佳、强度发展快且抗折强度显著增强的水泥基材料。本发明能显著提高水泥基材料的韧性，从而大幅度提高水泥基材料的应用范围，应用前景广阔。The invention belongs to the technical field of building materials, and in particular relates to a polymer in-situ toughened cement-based material and a preparation method thereof. The raw materials used for toughening the cement-based material in the present invention are: polyvinyl alcohol, latex powder, high-efficiency water reducer, defoamer and early strength agent. In the present invention, according to actual needs, the above-mentioned raw materials are measured in a certain proportion, dissolved in mixing water, and then cement and aggregates are added into the mixing water for mixing and stirring to obtain good fluidity, good workability, fast strength development and Cementitious material with significantly enhanced flexural strength. The invention can significantly improve the toughness of the cement-based material, thereby greatly increasing the application range of the cement-based material, and has broad application prospects.
Description
技术领域technical field
本发明属于建筑材料技术领域，具体涉及一种聚合物原位增韧水泥基材料及其制备方法。The invention belongs to the technical field of building materials, and in particular relates to a polymer in-situ toughened cement-based material and a preparation method thereof.
背景技术Background technique
材料在振动或冲击等荷载作用下，能够吸收较多的能量，并产生较大的变形而不突然破坏的性质称为韧性。水泥基材料的韧性通常是指此类材料的抗折强度，因此本发明中所提到水泥基材料抗折强度的改善即表明水泥基材料的韧性得到了改善。The property that a material can absorb more energy and produce larger deformation without sudden failure under loads such as vibration or impact is called toughness. The toughness of cement-based materials usually refers to the flexural strength of such materials, so the improvement of the flexural strength of cement-based materials mentioned in the present invention means that the toughness of cement-based materials has been improved.
水泥基材料是一种典型的脆性材料，常见的水泥基材料有净浆、砂浆及混凝土等。水泥基材料具有抗压强度高但抗折强度低的特点，在实际使用中，容易因为应力集中或长期受到剪切应力的作用而产生裂纹，进而导致耐久性下降，这大大限制了水泥基材料的应用范围。例如，由于混凝土的抗折强度不高且刚度大，这限制了此类材料在高等级公路中的应用。Cement-based materials are a typical brittle material. Common cement-based materials include paste, mortar, and concrete. Cement-based materials have the characteristics of high compressive strength but low flexural strength. In actual use, cracks are prone to occur due to stress concentration or long-term shear stress, which leads to a decrease in durability, which greatly limits the use of cement-based materials. scope of application. For example, the low flexural strength and high stiffness of concrete limit the application of this type of material in high-grade highways.
为了提高水泥基材料的韧性，研究人员开展了大量的试验研究，最终应用最广泛的方法有纤维增韧法和聚合物增韧法。In order to improve the toughness of cement-based materials, researchers have carried out a large number of experimental studies, and the most widely used methods are fiber toughening and polymer toughening.
纤维增韧法是在拌制水泥基材料的过程中添加纤维（如：合成纤维、钢纤维和玻璃纤维等），利用纤维能够限制微裂纹发展以及纤维本身具有高韧性这两个重要特性，有效改善了水泥基材料的韧性，但此法也存在明显的不足。首先，纤维在水泥基材料拌合过程中容易团结，难以分散均匀，其增韧效果受纤维在拌合物中的分布状况及取向情况影响较大。其次，许多纤维与水泥基材料基体结合效果差，即在水泥基材料破坏时，纤维的破坏形式是拔出而非拉断，因此增韧效果不佳。合成纤维密度小，单丝直径较小，存在增稠效应，不利于水泥基材料的震动密实。而普通的玻璃纤维则由于耐碱性差而受到了应用上的限制。The fiber toughening method is to add fibers (such as synthetic fibers, steel fibers and glass fibers, etc.) in the process of mixing cement-based materials, and use the two important characteristics of fibers to limit the development of micro-cracks and the fibers themselves to have high toughness, which is effective The toughness of cement-based materials is improved, but this method also has obvious deficiencies. First of all, fibers are easy to unite during the mixing process of cement-based materials, and it is difficult to disperse uniformly. The toughening effect is greatly affected by the distribution and orientation of fibers in the mixture. Secondly, many fibers have poor bonding effect with the cement-based material matrix, that is, when the cement-based material is damaged, the fiber is pulled out rather than broken, so the toughening effect is not good. Synthetic fiber has low density and small single filament diameter, which has a thickening effect, which is not conducive to the vibration and compaction of cement-based materials. Ordinary glass fibers are limited in application due to their poor alkali resistance.
聚合物增韧法是在拌制水泥基材料的过程中添加聚合物（如：聚合物乳液或干粉），利用大量聚合物在水泥基材料内部形成连续的聚合物膜来提高材料的韧性。同样，此法也存在明显的不足。首先，从作用机理角度出发，为了在水泥基材料内部形成连续的聚合物膜，必须添加较多的聚合物，从而提高了使用成本。同时，由于聚合物掺量的提高，水泥基材料的抗压强度明显降低，有时甚至会严重延缓水泥水化。此外，聚合物增韧法对水泥基材料的养护条件也有要求，一般湿度较大的环境下不利于聚合物膜的形成，同时也不利于水泥基材料强度的发展。最后，一些聚合物乳液与水泥基材料还存在适应性差的问题，使用时可能会造成质量事故。The polymer toughening method is to add polymers (such as polymer emulsion or dry powder) in the process of mixing cement-based materials, and use a large amount of polymers to form a continuous polymer film inside the cement-based materials to improve the toughness of the materials. Similarly, this method also has obvious deficiencies. First of all, from the perspective of the mechanism of action, in order to form a continuous polymer film inside the cement-based material, more polymer must be added, which increases the cost of use. At the same time, due to the increase of polymer content, the compressive strength of cement-based materials is significantly reduced, and sometimes even the hydration of cement is seriously delayed. In addition, the polymer toughening method also has requirements on the curing conditions of cement-based materials. Generally, the environment with high humidity is not conducive to the formation of polymer films, and is also not conducive to the development of the strength of cement-based materials. Finally, some polymer emulsions have poor adaptability to cement-based materials, which may cause quality accidents when used.
发明内容Contents of the invention
本发明的目的在于提供一种聚合物原位增韧水泥基材料及其制备方法，该原位增韧材料能够大幅度的提高水泥基材料的韧性，从而大大提高水泥基材料的应用范围。The purpose of the present invention is to provide a polymer in-situ toughened cement-based material and a preparation method thereof. The in-situ toughened material can greatly improve the toughness of the cement-based material, thereby greatly improving the application range of the cement-based material.
本发明提出的一种聚合物原位增韧水泥基材料，所用的增韧原材料由聚乙烯醇、乳胶粉、高效减水剂、消泡剂及早强剂组成，各组分的重量比为：A polymer in-situ toughening cement-based material proposed by the present invention, the toughening raw material used is composed of polyvinyl alcohol, latex powder, high-efficiency water reducer, defoamer and early strength agent, and the weight ratio of each component is:
聚乙烯醇100Polyvinyl alcohol 100
乳胶粉2-12Latex powder 2-12
高效减水剂0.2-2.0Superplasticizer 0.2-2.0
消泡剂0.004-0.080Defoamer 0.004-0.080
早强剂1.2-8.0Early strength agent 1.2-8.0
其中，所述的聚乙烯醇（简称“PVA”）具有如下特征：Among them, the polyvinyl alcohol (referred to as "PVA") has the following characteristics:
1）所述聚乙烯醇的分子结构式为（CH3CHCOOCH3）x（CH2CHOH）y，其中：（x+y）表示聚合度，y/（x+y）表示醇解度；1) The molecular structural formula of the polyvinyl alcohol is (CH 3 CHCOOCH 3 ) x (CH 2 CHOH) y , wherein: (x+y) represents the degree of polymerization, and y/(x+y) represents the degree of alcoholysis;
2）所述聚乙烯醇的分子量范围为（19664~117984），醇解度为88%；2) The molecular weight range of the polyvinyl alcohol is (19664~117984), and the degree of alcoholysis is 88%;
3）所述聚乙烯醇为PVA-0488、PVA-0588、PVA-1788、PVA-2088或PVA-2488中的任一种；各种聚乙烯醇的表述含义为：字母部分“PVA”表示“聚乙烯醇”，而数字部分的“前两位”表示“聚合度的千、百位数”，“后两位”表示“醇解度”。如“PVA-0488”表示“聚合度为400，醇解度为88%的聚乙烯醇”，以此类推。3) The polyvinyl alcohol is any one of PVA-0488, PVA-0588, PVA-1788, PVA-2088 or PVA-2488; the expressions and meanings of various polyvinyl alcohols are: the letter part "PVA" means " Polyvinyl alcohol", while the "first two digits" of the number part indicate "thousands and hundreds of degrees of polymerization", and the "last two digits" indicate "degree of alcoholysis". For example, "PVA-0488" means "polyvinyl alcohol with a degree of polymerization of 400 and a degree of alcoholysis of 88%", and so on.
各组份较佳重量比为：The preferred weight ratio of each component is:
聚乙烯醇100Polyvinyl alcohol 100
乳胶粉4-10Latex powder 4-10
高效减水剂0.4-1.5Superplasticizer 0.4-1.5
消泡剂0.008-0.050Defoamer 0.008-0.050
早强剂2.0-6.0Early strength agent 2.0-6.0
本发明中，所述的乳胶粉为醋酸乙烯酯与乙烯共聚胶粉。In the present invention, the latex powder is vinyl acetate and ethylene copolymer powder.
本发明中，所述的高效减水剂为粉状聚羧酸系减水剂，减水率≥25%。In the present invention, the high-efficiency water reducer is a powdery polycarboxylate water reducer with a water reducing rate ≥ 25%.
本发明中，所述的消泡剂为粉状有机硅消泡剂。In the present invention, the defoamer is a powdery silicone defoamer.
本发明中，所述的早强剂为甲酸钙。In the present invention, the accelerator is calcium formate.
本发明提出的聚合物原位增韧水泥基材料的制备方法为，根据实际需求，将上述原材料按一定比例量取后，溶解于拌合水中，再将水泥和集料加入到拌合水中进行混合搅拌即可。The preparation method of the polymer in-situ toughened cement-based material proposed by the present invention is as follows: according to actual needs, the above-mentioned raw materials are measured in a certain proportion, dissolved in mixing water, and then cement and aggregates are added into the mixing water to carry out Mix and stir.
本发明中，聚乙烯醇通过两种途径提高了水泥基材料的韧性。一方面，聚乙烯醇具有很好的成膜特性，能够在水泥基材料内部形成连续的聚合物膜，从而提高水泥基材料的韧性。另一方面，聚乙烯醇加入到水泥基材料中能够有效提高C-S-H的聚合度，而C-S-H又是水泥水化的主要产物和水泥基材料强度发展的重要来源，因此能够有效改善水泥基材料的强度，特别是水泥基材料的抗折强度，从而改善了水泥基材料的韧性。然而，随着水泥基材料拌合过程中聚乙烯醇掺量的不断提高，拌合物的粘度显著增大，工作性变差，本发明通过加入乳胶粉和高效减水剂对拌合物的工作性进行改善。同时，乳胶粉的加入能够与聚乙烯醇对水泥基材料的增韧起到协同作用。消泡剂能够消除水泥基材料拌合过程中产生的有害气泡，提高水泥基材料的强度，特别是抗折强度。由于本发明中选用了多种聚合物，而这些聚合物会对水泥基材料的强度发展起到延缓作用，因此本发明选用甲酸钙作为早强剂来提高水泥基材料的强度发展。In the present invention, polyvinyl alcohol improves the toughness of cement-based materials in two ways. On the one hand, polyvinyl alcohol has good film-forming properties and can form a continuous polymer film inside the cement-based material, thereby improving the toughness of the cement-based material. On the other hand, adding polyvinyl alcohol to cement-based materials can effectively increase the degree of polymerization of C-S-H, and C-S-H is the main product of cement hydration and an important source of strength development of cement-based materials, so it can effectively improve the strength of cement-based materials , especially the flexural strength of cement-based materials, thereby improving the toughness of cement-based materials. However, with the continuous increase of the amount of polyvinyl alcohol in the mixing process of cement-based materials, the viscosity of the mixture increases significantly, and the workability becomes poor. Workability is improved. At the same time, the addition of latex powder can play a synergistic effect with the toughening of polyvinyl alcohol on cement-based materials. The defoamer can eliminate harmful air bubbles generated during the mixing process of cement-based materials, and improve the strength of cement-based materials, especially the flexural strength. Because multiple polymers are selected in the present invention, and these polymers can delay the strength development of cement-based materials, calcium formate is selected as an early strength agent in the present invention to improve the strength development of cement-based materials.
本发明正是利用了聚乙烯醇良好的增韧特性，提出了一种聚合物原位增韧水泥基材料及其制备方法，发明中还用到了乳胶粉、高效减水剂、消泡剂和早强剂。本发明的制备工艺简单、对水泥基材料的抗压强度影响小，但能够显著提高水泥基材料的抗折强度，即大幅度改善了水泥基材料的韧性，从而提高了水泥基材料的应用范围，应用前景广阔。The present invention utilizes the good toughening properties of polyvinyl alcohol, and proposes a polymer in-situ toughened cement-based material and its preparation method. In the invention, latex powder, high-efficiency water reducer, defoamer and Early strengthening agent. The preparation process of the present invention is simple and has little effect on the compressive strength of cement-based materials, but can significantly improve the flexural strength of cement-based materials, that is, greatly improve the toughness of cement-based materials, thereby increasing the application range of cement-based materials , the application prospect is broad.
具体实施方式detailed description
本发明提供了一种聚合物原位增韧水泥基材料及其制备方法，为使本发明的目的、技术方案及效果更加清楚明确，下面通过将此项发明分别应用于净浆、砂浆及混凝土这三类水泥基材料中以说明本发明的技术方案。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。The present invention provides a polymer in-situ toughened cement-based material and its preparation method. In order to make the purpose, technical scheme and effect of the present invention clearer, the following applies this invention to clean paste, mortar and concrete respectively In these three types of cement-based materials, the technical scheme of the present invention is described. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
实施例1，一种聚合物原位增韧水泥基材料及其制备方法，按照原材料重量比为：聚乙烯醇（PVA-0488）100，乳胶粉（醋酸乙烯酯与乙烯共聚胶粉）2，高效减水剂（粉状聚羧酸系减水剂，减水率≥25%）0.2，消泡剂（粉状有机硅消泡剂）0.004及早强剂（甲酸钙）1.2称取原材料并混合均匀即得所需产品，记为P1，备用。Example 1, a polymer in-situ toughened cement-based material and its preparation method, according to the weight ratio of raw materials: polyvinyl alcohol (PVA-0488) 100, latex powder (vinyl acetate and ethylene copolymer powder) 2, High-efficiency water reducer (powdered polycarboxylate water reducer, water reducing rate ≥ 25%) 0.2, defoamer (powdered silicone defoamer) 0.004 and early strength agent (calcium formate) 1.2 Weigh raw materials and mix The required product is obtained evenly, which is recorded as P1 and set aside.
实施例2，一种聚合物原位增韧水泥基材料及其制备方法，按照原材料重量比为：聚乙烯醇（PVA-0588）100，乳胶粉（醋酸乙烯酯与乙烯共聚胶粉）4，高效减水剂（粉状聚羧酸系减水剂，减水率≥25%）0.4，消泡剂（粉状有机硅消泡剂）0.008及早强剂（甲酸钙）2.0称取原材料并混合均匀即得所需产品，记为P2，备用。Example 2, a polymer in-situ toughened cement-based material and its preparation method, according to the weight ratio of raw materials: polyvinyl alcohol (PVA-0588) 100, latex powder (vinyl acetate and ethylene copolymer powder) 4, High-efficiency water reducer (powdered polycarboxylate water reducer, water reducing rate ≥ 25%) 0.4, defoamer (powdered silicone defoamer) 0.008 and early strength agent (calcium formate) 2.0 Weigh the raw materials and mix them The desired product is obtained evenly, which is recorded as P2 and set aside.
实施例3，一种聚合物原位增韧水泥基材料及其制备方法，按照原材料重量比为：聚乙烯醇（PVA-1788）100，乳胶粉（醋酸乙烯酯与乙烯共聚胶粉）6，高效减水剂（粉状聚羧酸系减水剂，减水率≥25%）0.9，消泡剂（粉状有机硅消泡剂）0.020及早强剂（甲酸钙）3.5称取原材料并混合均匀即得所需产品，记为P3，备用。Example 3, a polymer in-situ toughened cement-based material and its preparation method, according to the weight ratio of raw materials: polyvinyl alcohol (PVA-1788) 100, latex powder (vinyl acetate and ethylene copolymer powder) 6, High-efficiency water reducer (powdered polycarboxylate water reducer, water reducing rate ≥ 25%) 0.9, defoamer (powdered silicone defoamer) 0.020 and early strength agent (calcium formate) 3.5 Weigh raw materials and mix The desired product is obtained evenly, which is recorded as P3 and set aside.
实施例4，一种聚合物原位增韧水泥基材料及其制备方法，按照原材料重量比为：聚乙烯醇（PVA-2088）100，乳胶粉（醋酸乙烯酯与乙烯共聚胶粉）10，高效减水剂（粉状聚羧酸系减水剂，减水率≥25%）1.5，消泡剂（粉状有机硅消泡剂）0.050及早强剂（甲酸钙）6.0称取原材料并混合均匀即得所需产品，记为P4，备用。Example 4, a polymer in-situ toughened cement-based material and its preparation method, according to the weight ratio of raw materials: polyvinyl alcohol (PVA-2088) 100, latex powder (vinyl acetate and ethylene copolymer powder) 10, High-efficiency water reducer (powdered polycarboxylate water reducer, water reducing rate ≥ 25%) 1.5, defoamer (powdered silicone defoamer) 0.050 and early strength agent (calcium formate) 6.0 Weigh the raw materials and mix them The desired product is obtained evenly, which is recorded as P4 and set aside.
实施例5，一种聚合物原位增韧水泥基材料及其制备方法，按照原材料重量比为：聚乙烯醇（PVA-2488）100，乳胶粉（醋酸乙烯酯与乙烯共聚胶粉）12，高效减水剂（粉状聚羧酸系减水剂，减水率≥25%）2.0，消泡剂（粉状有机硅消泡剂）0.080及早强剂（甲酸钙）8.0称取原材料并混合均匀即得所需产品，记为P5，备用。Example 5, a polymer in-situ toughened cement-based material and its preparation method, according to the weight ratio of raw materials: polyvinyl alcohol (PVA-2488) 100, latex powder (vinyl acetate and ethylene copolymer powder) 12, High-efficiency water reducer (powdered polycarboxylate water reducer, water reducing rate ≥ 25%) 2.0, defoamer (powdered silicone defoamer) 0.080 and early strength agent (calcium formate) 8.0 Weigh the raw materials and mix them The desired product is obtained evenly, which is recorded as P5 and set aside.
实施例说明：为了全面考察本发明在水泥基材料中的增韧效果，发明人将本发明应用于净浆、砂浆及混凝土这三种水泥基材料中，三种水泥基材料的配合比见表1，而本发明的最终增韧效果详见表2.Description of Examples: In order to comprehensively examine the toughening effect of the present invention in cement-based materials, the inventor applies the present invention to these three cement-based materials of clean slurry, mortar and concrete. The mixing ratios of the three cement-based materials are shown in the table 1, and the final toughening effect of the present invention is shown in Table 2.
表1净浆、砂浆及混凝土配合比Table 1 Mixing ratio of clean slurry, mortar and concrete
注：上述三种水泥基材料均选用符合GB8076-2008标准的基准水泥，水选用自来水。不添加增韧材料的记为空白组，添加增韧材料（上述实施例中已制备好的P1~P5）的试验组中增韧材料掺量均为水泥质量的15%。Note: The above three cement-based materials are selected from the benchmark cement that meets the GB8076-2008 standard, and tap water is selected as the water. The test group without toughening material was recorded as the blank group, and the toughening material content in the test group added with toughening material (prepared P1-P5 in the above examples) was 15% of the cement mass.
表2聚合物原位增韧水泥基材料应用效果Table 2 Application effect of polymer in-situ toughened cement-based materials
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