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CN1772691A - A Method of Precisely Controlling the Expansion of Steel Tube Concrete - Google Patents

A Method of Precisely Controlling the Expansion of Steel Tube Concrete Download PDF

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Publication number
CN1772691A
CN1772691A CNA2005100194760A CN200510019476A CN1772691A CN 1772691 A CN1772691 A CN 1772691A CN A2005100194760 A CNA2005100194760 A CN A2005100194760A CN 200510019476 A CN200510019476 A CN 200510019476A CN 1772691 A CN1772691 A CN 1772691A
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expansion
concrete
expansion agent
amount
water reducer
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CN1317219C (en
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胡曙光
丁庆军
吕林女
何永佳
王发洲
王红喜
彭艳周
邹定华
彭波
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Wuhan University of Technology WUT
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Abstract

The present invention relates to method of controlling expansion of steel pipe concrete precisely. The method of controlling expansion of steel pipe concrete precisely includes the following steps: 1. precisely designing and regulating expansion agent through sorting the expansion source and material of expansion agent, precisely designing and regulating expansion agent components and precisely designing and regulating expansion agent grain grading; 2. preparing and sorting concrete humidity regulating material; and 3. comprehensive fine designing and controlling the expansion amount of concrete. The present invention realizes the fine control of expansion in steel concrete.

Description

A kind of method of controlling expansion of steel pipe concrete precisely
Technical field
The invention belongs to building material field, relate to a kind of method that can control expansion of steel pipe concrete.
Background technology
Concrete filled steel tube is plain concrete to be poured into steel pipe and the matrix material made, and its composite design principle is: concrete is subjected to the lock ring effect of steel pipe walls, and intensity and toughness can improve greatly; Filled concrete in the steel pipe, can improve stability of structure and reduce steel using amount; The comprehensive price ratio of composition material obviously is better than two kinds of materials self.Its gordian technique is that core concrete and steel pipe walls are combined closely, and obtains composite effect, could realize designed composite performance like this.There is the intrinsic contraction of volume to a certain degree in normal concrete sclerosis back, so core concrete must be designed to have volumetric expansion and controllable performance.But existing various expansive concrete technology are difficult to satisfy this requirement at present, mainly are that swell increment is difficult to meticulous control, and concrete non-homogeneous expansion is even, easily cause concrete and steel pipe walls unsticking to form cavity, and the composite design performance of concrete filled steel tube can't be brought into play.Be because present cement expansive material expansion energy is lower on the one hand, the expansible time length is short, be that concrete filled steel tube is in closed environment on the other hand, outside moisture can't enter and replenish the moisture that consumes owing to hydrated cementitious, thereby can not produce the compensate for shrinkage effect in the agent of hydrated cementitious late expansion owing to lack the required moisture of reaction.In addition, people do not have the theory of meticulous control swell increment, just do not go meticulous design swell increment often at all, do not have the technology of accurately design and control expansion of steel pipe concrete yet.
Summary of the invention
At present expansive concrete swell increment can't meticulous control situation, the purpose of this invention is to provide a kind of method of controlling expansion of steel pipe concrete precisely.
Technical scheme of the present invention is: a kind of method of controlling expansion of steel pipe concrete precisely is characterized in that: step is as follows:
1, meticulous design of swelling agent and regulation and control:
(1) swelling agent expansion sources and starting material are chosen:
Exist the early expansion can be lower at present cement expansive material, expansion stable period is shorter, and concrete filled steel tube is in closed state, do not have extraneous moisture supply and be difficult to make swelling agent to expand with the problem of compensation later stage contraction, one aspect of the present invention is designed to the expansion sources of swelling agent by AFt, Mg (OH) 2And Fe (OH) 3Three kinds of expansion sources, wherein the AFt expansion sources utilizes the differential responses process of different substances generation to adjust the relation of speed of expansion, expansion and intensity, promptly being designed to provides the very fast expansion energy of speed of expansion higher early expansion source AFt by sulphoaluminate cement clinker and anhydrite, and provides the moderate expansion energy of speed of expansion higher expansion sources AFt in mid-term by giving birth to alum and anhydrite; 2 slower of late expansion source Mg (OH) of speed of expansion are designed to be provided with the mutually higher slag of RO by the calcining periclasite; The late expansion source Fe (OH) that speed of expansion is slower 3Then being designed to is provided by the mutually higher slag of RO.In swelling agent, mix a certain amount of porous materials such as zeolite powder on the other hand with certain porosity, make its water that stores at the aquation initial stage the concrete later stage during lack of water since pressure difference discharge, expand to produce for the expansion component aquation, zeolite powder also provides AFt to form required Al simultaneously 2O 3
Described sulphoaluminate cement clinker, its mineral composition are C 4A 3S:50～82%, C 4AF:3～13%, C 2S:5～37%:
Described MgO can be the MgO of periclasite after 950～1050 ℃ of calcination;
Described anhydrite can be natural or artificial anhydrite;
It is zeolite powder of 25～40% etc. that described porous material can be porosity, and its consumption accounts for 10%～20% of each starting material sum of swelling agent;
Described slag can be 400～500m 2/ kg and RO phase K mThe slag of (MgO/ (FeO+MnO))＞1.
(2) meticulous design of swelling agent component and regulation and control:
The raw-material proportioning of swelling agent designs by the chemical constitution in the table 1, simultaneously, according to the speed of expansion of different expansion sources, expansion energy size and with the relation of performances such as concrete shrinkage, intensity, the chemical constitution of swelling agent except that press table 1 control also need to SO 3/ Al 2O 3, SO 3/ MgO and SO 3Three indexs of/FeO are carried out following control (representing by mass ratio), that is:
SO 3/Al 2O 3＝2～3；
SO 3/MgO＝4～5；
SO 3/FeO＝6～8。
The chemical ingredients of table 1 swelling agent
Chemical ingredients SO 3 Al 2O 3 CaO MgO SiO 2 FeO R 2O
Content/% 25～35 10～15 15～35 6-8 15～35 4～6 0.2～0.75
Swelling agent chemical constitution after the above-mentioned meticulous design is regulated and control by raw-material proportioning.
(3) meticulous design of swelling agent grain composition and regulation and control:
The grain composition of swelling agent has directly influenced its speed of expansion and expansion character, and is too many as fine powder, and drying shrinkage is big, and the expansion drop is big; Meal is too many, and speed of expansion is too slow, and rate of expansion is low.The grain composition of swelling agent is carried out meticulous design by table 2:
The grain composition of table 2 swelling agent
Granularity/μ m ＜45 45～100 100～250 ＞250
Content/% 5～10 35～45 40～55 5～10
2. inside concrete relative humidity is regulated material preparation and is chosen:
Can not produce the subject matter of design swell increment because of the later stage lack of water at concrete filled steel tube, introduce a kind of moisture control material that can store a certain amount of moisture in advance and when inside concrete relative humidity sharply descends, discharge moisture, provide moisture to continue aquation for swelling agent, compensate for shrinkage also produces expansion.
The raw material of moisture control material can adopt Chemical Composition to be mainly CaO, Al 2O 3, Fe 2O 3, SiO 2, MgO and K 2O, Na 2Raw materials such as O, its chemical constitution mass range then exists: SiO 255～65%, Al 2O 318～25%, Fe 2O 36～10%, CaO+MgO4～6%, K 2O+Na 2O2～5%, loss on ignition 3～5%.Wherein, between CaO and the MgO any proportioning, K 2O and Na 2It between the O any proportioning.
Moisture control material preparation process flow process as shown in Figure 1, high temperature kiln temperature control condition: roasting 15～20min under 1100～1300 ℃ of conditions; Tapping temperature is controlled at 800～900 ℃; Cooling system: coming out of the stove is chilled to 700 ℃, at 700～400 ℃ of slowly coolings, chilling below 400 ℃; Granules preparation: the bulk material that sintering is formed adopts impact breaker or hammer mill to be crushed to 2～16mm, and particle surface is carried out special processing obtains the moisture control material.
The volume of moisture control material is 10～20% of a sand consumption.
3. the comprehensive meticulous control of expansion of steel pipe concrete:
Remove swelling agent, outside the moisture control material, the expansion of concrete filled steel tube also with cement kind and consumption, the kind of adulterant and water reducer and volume, factors such as concrete strength grade are closely related, so the comprehensive meticulous meticulous design and control technique that is controlled at swelling agent of expansion of steel pipe concrete amount of the present invention, on the moisture control material technology basis, according to strength grade of concrete, indexs such as adulterant and water reducer volume, concrete mix (seeing Table 3) the especially volume of cement expansive material is carried out following meticulous design, to reach the optimization coupling of gelling material, concrete strength and expansible coordinated development and the meticulous control of expansible:
(1) determines the basic volume of swelling agent according to gelling material
Make the SO of " cement+adulterant+swelling agent " system 3Equal 5% to determine the basic volume of swelling agent;
(2) determine expansive agent dosage according to strength grade of concrete, adulterant and water reducer
The basic volume of expansive agent dosage=swelling agent * (1+m/25) * [1+log (Ja/ β)] * γ
M is the total volume of adulterant (%) in the formula;
Ja is water reducer volume (%);
β is the water reducer influence coefficient, if water reducer is a naphthalene water reducer, then β=0.7 is a polycarboxylate dehydragent as if water reducer, then β=0.9;
γ is the strength grade of concrete influence coefficient, if strength grade≤C50, if γ=1 then is strength grade＞C50, then γ=1.1.
Adulterant is meant flyash, slag etc.
Table 3 concrete filled steel tube proportioning
Water-cement ratio Unit consumption of water (kg/m 3) Unit cement consumption (kg/m 3) Sand coarse aggregate ratio (%) Expansive agent dosage (%) Flyash and scoriaceous total volume (%) Moisture control material volume (%) (being the ratio of sand consumption) Water reducer volume (%)
0.28～0.42 175～195 400～500 35～42 10～18 0～20+0～25 (total volume≤25) 10-20 0.8～1.8
Wherein, cement is 32.5,42.5,52.5 ordinary portland cements (silicate cement or pulverized fuel ash cement or slag cement);
Swelling agent is above-mentioned swelling agent;
The moisture control material is above-mentioned moisture control material;
Flyash is II level flyash or I level flyash;
Slag is S95 slag or S105 slag;
Water reducer is a high efficiency water reducing agent, as the polycarboxylic acid high efficiency water reducing agent;
Water is tap water.
Sand coarse aggregate ratio is the per-cent that fine aggregate accounts for (being fine aggregate and the coarse aggregate) total amount of gathering materials, and wherein coarse aggregate is the rubble of 5～20mm or 5～25mm or the interval particle diameter of 5～31.5mm continuous grading; Fine aggregate is that fineness modulus is the sand of 2.3-3.1.
Characteristics of the present invention:
1, the present invention is by meticulous design and control technique to the expansion sources of swelling agent, starting material, chemical composition, grain composition, the moisture control material technology, and according to indexs such as strength grade of concrete, adulterant and water reducer volumes, volume to concrete mix especially cement expansive material carries out meticulous design, with the meticulous control of the optimization coupling that reaches gelling material, concrete strength and expansible coordinated development and swell increment;
2, one aspect of the present invention is designed to the expansion sources of swelling agent by AFt, Mg (OH) 2And Fe (OH) 3Three kinds of expansion sources, in swelling agent, mix a certain amount of porous materials such as zeolite powder on the other hand with certain porosity, make its water that stores at the aquation initial stage the concrete later stage during lack of water since pressure difference discharge, expand to produce for the expansion component aquation, zeolite powder also provides AFt to form required Al simultaneously 2O 3
The present invention adopts meticulous design of swelling agent and control technique, in course of hardening, discharge moisture in good time, quantitatively so that the moisture control material technology that concrete expansion physical reaction is normally carried out, and the concrete of considering features such as strength grade of concrete, adulterant consumption, water reducer kind and volume expand comprehensive meticulous design and control techniques, realize the meticulous control of expansion of steel pipe concrete.
Description of drawings
Fig. 1 is a moisture control material preparation process schema of the present invention
Embodiment
Embodiment 1 (C50 concrete filled steel tube):
Starting material:
(1) cement,
42.5 ordinary Portland cement,
(2) swelling agent,
With sulphoaluminate cement clinker, periclasite MgO, natural or artificial anhydrite, the porosity after 950～1050 ℃ of calcination 25～40% porous materials such as zeolite powder, specific surface area 400～500m 2/ kg and RO phase K mThe slag of (MgO/ (FeO+MnO))＞1 is pressed SO 3/ Al 2O 3=2.6, SO 3/ MgO=4.4, SO 3The chemical constitution of/FeO=6 and table 1 is prepared burden, and the homogenizing grinding to grain composition to table 2 scope, adorn bag at last, seal up for safekeeping, make that expansion energy is big, speed of expansion rationally, can make concrete expansion continually and steadily, expansion component and grain composition obtain the swelling agent of meticulous control.
(3) moisture control material,
By shale is that raw material is prepared from by technical process Fig. 1, and particle diameter is at 2～7.5mm, and the 24h water-intake rate is 15～20% moisture control material.
(4) flyash,
I level flyash,
(5) gather materials: coarse aggregate is the rubble of the interval particle diameter of 5-20mm continuous grading, crush values＜10%, faller gill shape content＜10%; Fine aggregate is that fineness modulus is the sand of 2.3-3.1.
(6) water reducer,
Water reducer: polycarboxylic acid high efficiency water reducing agent, water-reducing rate 28-30%.
Cooperate performance when:
Table 4 C50 concrete filled steel tube cooperates performance (kg/m when 3)
Cement Water Flyash Coarse aggregate Sand Water reducer Swelling agent The moisture control material Ultimate compression strength/MPa The initial slump (mm) The slump behind the 3h (mm)
420 190 80 1083 510 1.3％ 55 73 59 220 190
Limited expansion rate (* 10 under 20 ± 3 ℃ of air tight conditions of table 5 C50 concrete filled steel tube -4)
7 days 28 days 56 days 90 days 180 days
2.7 3.7 3.8 3.7 3.7
Embodiment 2 (C60 concrete filled steel tube):
Starting material:
(3) cement:
52.5 ordinary Portland cement,
(4) swelling agent:
With sulphoaluminate cement clinker, periclasite MgO, natural or artificial anhydrite, the porosity after 950～1050 ℃ of calcination 25～40% porous materials such as zeolite powder, specific surface area 400～500m 2/ kg and RO phase K mThe slag of (MgO/ (FeO+MnO))＞1 is pressed SO 3/ Al 2O 3=2.6, SO 3/ MgO=4.4, SO 3The chemical constitution of/FeO=6 and table 1 is prepared burden, and the homogenizing grinding to grain composition to table 2 scope, adorn bag at last, seal up for safekeeping, make that expansion energy is big, speed of expansion rationally, can make concrete expansion continually and steadily, expansion component and grain composition obtain the swelling agent of meticulous control.
(3) moisture control material:
By shale is that raw material is prepared from by technical process Fig. 1, and particle diameter is at 2～7.5mm, and the 24h water-intake rate is 15～20% moisture control material.
(4) flyash,
I level flyash,
(5) gather materials: coarse aggregate is the rubble of the interval particle diameter of 5-20mm continuous grading, crush values＜10%, faller gill shape content＜10%; Fine aggregate is that fineness modulus is the sand of 2.3-3.1.
(6) water reducer:
Water reducer: polycarboxylic acid high efficiency water reducing agent, water-reducing rate 28-30%.
Proportioning and performance
Table 6 C60 concrete filled steel tube proportioning (Kg/m 3) and performance
Cement Water Flyash Coarse aggregate Sand Water reducer Swelling agent The moisture control material Ultimate compression strength/MPa The initial slump (mm) The slump behind the 3h (mm)
460 185 70 1050 650 1.5％ 66 77 70 220 200
Limited expansion rate (* 10 under 20 ± 3 ℃ of air tight conditions of table 7 C60 concrete filled steel tube -4)
7 days 28 days 56 days 90 days 180 days
2.6 3.6 3.5 3.6 3.6

Claims (1)

1.一种精细控制钢管混凝土膨胀的方法，其特征是：步骤如下：1).膨胀剂精细设计与调控：1. A method for finely controlling the expansion of steel-filled steel tube concrete is characterized in that: the steps are as follows: 1). Fine design and regulation of expansion agent: (1)膨胀剂膨胀源及原材料选取：一方面将膨胀剂的膨胀源设计成由AFt、Mg(OH)2和Fe(OH)3三种膨胀源，另一方面在膨胀剂中掺入孔隙率为25～40％的沸石粉多孔材料；原材料为：硫铝酸盐水泥熟料，方镁石经950～1050℃锻烧后的MgO，天然或人工硬石膏，孔隙率为25～40％的沸石粉，400～500m2/kg且RO相Km(MgO/(FeO+MnO))＞1的钢渣；所述的硫铝酸盐水泥熟料，其矿物组成为C4A3S：50～82％、C4AF：3～13％、C2S：5～37％：(1) Expansion source of expansion agent and selection of raw materials: on the one hand, the expansion source of the expansion agent is designed to be composed of three expansion sources of AFt, Mg(OH) 2 and Fe(OH) 3 ; on the other hand, pores are mixed into the expansion agent Zeolite powder porous material with a rate of 25-40%; raw materials: sulphoaluminate cement clinker, MgO after periclase calcined at 950-1050°C, natural or artificial anhydrite, with a porosity of 25-40% zeolite powder, steel slag of 400-500m 2 /kg and RO phase K m (MgO/(FeO+MnO))>1; the mineral composition of the sulphoaluminate cement clinker is C 4 A 3 S: 50-82%, C 4 AF: 3-13%, C 2 S: 5-37%: (2)膨胀剂组分精细设计与调控：(2) Fine design and regulation of expansion agent components: 膨胀剂的化学组成成分除按质量百分含量为SO3：25～35％、Al2O3：10～15％、CaO：15～35％、MgO：6-8％、SiO2：15～35％、FeO：4～6％、R2O：0.2～0.75％控制，且按质量比：SO3/Al2O3＝2～3；SO3/MgO＝4～5；SO3/FeO＝6～8控制；The chemical composition of the expansion agent is SO 3 : 25~35%, Al 2 O 3 : 10~15%, CaO: 15~35%, MgO: 6-8%, SiO 2 : 15~ 35%, FeO: 4~6%, R 2 O: 0.2~0.75% control, and according to mass ratio: SO 3 /Al 2 O 3 =2~3; SO 3 /MgO=4~5; SO 3 /FeO = 6 ~ 8 control; (3)膨胀剂颗粒级配精细设计与调控：(3) Fine design and control of particle size distribution of expansion agent: 膨胀剂的颗粒级配按粒度/μm：＜45其质量百分含量为5～10％，粒度/μm：45～100其质量百分含量为35～45％，粒度/μm：100～250其质量百分含量为40～55％，粒度/μm：＞250其质量百分含量为5～10％，进行精细设计和控制；The particle gradation of the expansion agent is based on particle size/μm: <45, its mass percentage is 5-10%, particle size/μm: 45-100, its mass percentage is 35-45%, particle size/μm: 100-250% The mass percentage is 40-55%, particle size/μm: >250, the mass percentage is 5-10%, and fine design and control are carried out; 2).混凝土内部相对湿度调节材料制备与选取：选择化学成份质量范围在：SiO2：55～65％、Al2O3：18～25％、Fe2O3：6～10％、CaO+MgO：4～6％、K2O+Na2O：2～5％、烧失量3～5％的原材料，利用回转窑在1100～1300℃条件下焙烧15～20min；出炉温度控制在800～900℃，急冷至700℃，700～400℃缓慢冷却，400℃以下采用急冷；冷却至室温后采用反击式破碎机或锤式破碎机破碎至2～16mm，制得调节混凝土内部相对湿度的湿度调节材料；湿度调节材料在混凝土中的掺量为10～20％；2). Preparation and selection of materials for relative humidity adjustment inside concrete: select chemical components in the range of mass: SiO 2 : 55-65%, Al 2 O 3 : 18-25%, Fe 2 O 3 : 6-10%, CaO+ MgO: 4-6%, K 2 O+Na 2 O: 2-5%, loss on ignition 3-5% of the raw materials, use the rotary kiln to roast at 1100-1300°C for 15-20min; the furnace temperature is controlled at 800 ~900°C, rapid cooling to 700°C, slow cooling at 700~400°C, rapid cooling below 400°C; after cooling to room temperature, use an impact crusher or hammer crusher to crush to 2~16mm, and make concrete for adjusting the relative humidity inside the concrete Humidity regulating material; the content of humidity regulating material in concrete is 10-20%; 3).混凝土膨胀量综合精细设计与控制：钢管混凝土配合比：水胶比0.28～0.42，单位用水量175～195kg/m3，单位水泥用量400～500kg/m3，砂率35～42％，膨胀剂掺量所占总质量10～18％，粉煤灰+矿渣掺量所占总质量0～20％+0～25％、且总掺量≤25％，湿度调节材料掺量为砂用量的比例10-20％，高效减水剂掺量所占总质量0.8～1.8％；3).Comprehensive fine design and control of concrete expansion: steel pipe concrete mix ratio: water-binder ratio 0.28-0.42, unit water consumption 175-195kg/m 3 , unit cement consumption 400-500kg/m 3 , sand rate 35-42% , the amount of expansion agent accounts for 10-18% of the total mass, the amount of fly ash + slag accounts for 0-20%+0-25% of the total mass, and the total amount is ≤25%, and the amount of humidity-adjusting material is sand The proportion of dosage is 10-20%, and the dosage of superplasticizer accounts for 0.8-1.8% of the total mass; 膨胀剂的掺量进行如下精细设计：(1)据胶凝材料确定膨胀剂基本掺量：使“水泥+掺合料+膨胀剂”体系的SO3等于5％以确定膨胀剂基本掺量；The amount of expansion agent is carefully designed as follows: (1) determine the basic amount of expansion agent according to the cementitious material: make the SO3 of the "cement+admixture+expansion agent" system equal to 5% to determine the basic amount of expansion agent; (2)根据混凝土强度等级、掺合料以及减水剂确定膨胀剂掺量：(2) Determine the amount of expansion agent according to the concrete strength grade, admixture and water reducer: 膨胀剂掺量＝膨胀剂基本掺量×(1+m/25)×[1+log(Ja/β)]×γThe amount of expansion agent = the basic amount of expansion agent × (1+m/25) × [1+log (Ja/β)] × γ 式中：m为掺合料总掺量(％)；In the formula: m is the total amount of admixture (%); Ja为减水剂掺量(％)；Ja is the dosage of water reducer (%); β为减水剂影响系数，若减水剂为萘系减水剂，则β＝0.7，若减水剂为聚羧酸盐减水剂，则β＝0.9；β is the influence coefficient of the water reducer. If the water reducer is a naphthalene-based water reducer, then β=0.7; if the water reducer is a polycarboxylate water reducer, then β=0.9; γ为混凝土强度等级影响系数，若强度等级≤C50，则γ＝1，若强度等级＞C50，则γ＝1.1。γ is the influence coefficient of concrete strength grade, if the strength grade ≤ C50, then γ=1, if the strength grade>C50, then γ=1.1.
CNB2005100194760A 2005-09-22 2005-09-22 Method of controlling expansion of steel pipe concrete precisely Expired - Fee Related CN1317219C (en)

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Cited By (8)

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CN100369856C (en) * 2006-06-01 2008-02-20 上海交通大学 Early-strength micro-expansion steel fiber road concrete
CN101537665B (en) * 2008-03-21 2010-07-28 北京康之维科贸有限公司 Method for controlling humidity of sand and stone material in automatic production process of colored concrete
CN103435317A (en) * 2013-08-16 2013-12-11 武汉理工大学 Compound expanding agent for inhibiting temperature rising in early stage and promoting hydration in later stage and preparation method thereof
CN104478344A (en) * 2014-12-25 2015-04-01 安徽工业大学 Preparation method of expansive concrete containing steel slag
CN104591643A (en) * 2014-12-25 2015-05-06 安徽工业大学 Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column
CN104671687A (en) * 2015-01-23 2015-06-03 湖州丰盛新材料有限公司 Concrete expansive agent and preparation method thereof
CN105906262A (en) * 2016-04-15 2016-08-31 湖北大学 Continuous fine swelling controlled concrete-filled steel tube
CN109231866A (en) * 2018-10-12 2019-01-18 天津市金盛源特种建材有限公司 A kind of heat of hydration suppressive cement expansive material and preparation method thereof

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CN101537665B (en) * 2008-03-21 2010-07-28 北京康之维科贸有限公司 Method for controlling humidity of sand and stone material in automatic production process of colored concrete
CN103435317A (en) * 2013-08-16 2013-12-11 武汉理工大学 Compound expanding agent for inhibiting temperature rising in early stage and promoting hydration in later stage and preparation method thereof
CN104478344A (en) * 2014-12-25 2015-04-01 安徽工业大学 Preparation method of expansive concrete containing steel slag
CN104591643A (en) * 2014-12-25 2015-05-06 安徽工业大学 Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column
CN104671687A (en) * 2015-01-23 2015-06-03 湖州丰盛新材料有限公司 Concrete expansive agent and preparation method thereof
CN105906262A (en) * 2016-04-15 2016-08-31 湖北大学 Continuous fine swelling controlled concrete-filled steel tube
CN105906262B (en) * 2016-04-15 2018-02-16 湖北大学 It is a kind of to continue fine expansion control concrete filled steel tube
CN109231866A (en) * 2018-10-12 2019-01-18 天津市金盛源特种建材有限公司 A kind of heat of hydration suppressive cement expansive material and preparation method thereof
CN109231866B (en) * 2018-10-12 2021-10-22 天津市金盛源特种建材有限公司 Hydration heat inhibition type concrete expanding agent and preparation method thereof

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