CN102745933B - Anti-crack expanding agent and preparation method thereof - Google Patents
Anti-crack expanding agent and preparation method thereof Download PDFInfo
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- CN102745933B CN102745933B CN 201210254954 CN201210254954A CN102745933B CN 102745933 B CN102745933 B CN 102745933B CN 201210254954 CN201210254954 CN 201210254954 CN 201210254954 A CN201210254954 A CN 201210254954A CN 102745933 B CN102745933 B CN 102745933B
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Abstract
The invention discloses an anti-crack expanding agent which comprises the following ingredients by weight: 35%-40% of calcium oxide clinker, 15%-20% of gypsum, 30%-35% of dickite, 5%-10% of coal ash and 2%-5% of wollastonite powder, wherein the sum of the weight ratios is 100%. The invention further discloses a preparation method of the anti-crack expanding agent. Compared with the prior art, the anti-crack expanding agent disclosed by the invention has the advantages of being capable of effectively preventing concrete from cracking so as to improve compactness.
Description
Technical field
The present invention relates to a kind of concrete additive, relate in particular to a kind of cracking resistance swelling agent, the invention still further relates to the preparation method of this cracking resistance swelling agent.
Background technology
Concrete be most widely used in present construction work, of paramount importance base mateiral.It has obtained irreplaceable position with characteristics such as curing in its exclusive ultimate compression strength, bonding strength, cast-in-place moulding, water, strong, durable.But there is not again the very crucial defective of person simultaneously in it, as: tensile strength is low, and ultimate tensile strength is little, easily forms cracking when plastic shrinkage, causes the water-impervious scarce capacity, the intensity index of direct overslaugh engineering when serious.So cracking resistance and water-impervious are to be accompanied by the long-term problem that concrete is used.The technical scheme that solves at present is when construction, do the diminishing processing according to the cement characteristics that adopts and sandstone feature in carrying out concrete casting process, strengthen water cement ratio and control early stage rate of expansion, the control of realization to contract with dry rate prevents from occurring in afterhardening crackle and causes strength degradation and seepage.
Cracking resistance water reducer product direct and that engineering construction is supporting has appearred for this reason.This series products is a kind of admixture of cement special use, is mixed to comprise swelling agent and efficient dehydrating agent component, is that each component is through grinding, be mixed the mixture that forms.The suitable expansion that normally produces by means of swelling agent comes compensate for shrinkage, antagonism to produce cracking; And waterproof technique routine to be micro-expanding agent add efficient dehydrating agent is filled up concrete crackle and is made concrete more closely knit by means of adding the ettringite that generates with cement after water and turgor pressure, reaches simultaneously the effect of antiseep.This present class anti-crack water-proof agent is all not obvious to the compensating action of the plastic shrinkage in the premature cure process, to great especially engineering and the class engineering of speedily carrying out rescue work to intensity with anti-ly be impregnated with the local obviously also inapplicable of special requirement.Particularly at present the basicity of a lot of swelling agents is higher, can cause with concrete in the alkali aggregate produce the decline that reaction causes bonding strength, caused people's highly vigilant of.Based on this, also disclose a kind of low-alkalinity composite cracking-against waterproof agent in prior art, but referenced patent number is the Chinese invention patent of ZL200710061838.1.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of effectively crack preventing to produce and then improve the cracking resistance swelling agent of compactness for the above-mentioned state of the art.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of cracking resistance swelling agent is characterized in that comprising following component and weight proportion thereof:
Calcia linker: 35% ~ 40%;
Gypsum: 15% ~ 20%;
Dickite: 30% ~ 35%;
Flyash: 5% ~ 10%;
Wollastonite powder: 2% ~ 5%,
Above-mentioned weight ratio sum is 100%.
As preferably, comprise following component and weight proportion thereof:
Calcia linker: 36% ~ 39%;
Gypsum: 18% ~ 19%;
Dickite: 33% ~ 34%;
Flyash: 6% ~ 8%;
Wollastonite powder: 3% ~ 4%,
Above-mentioned weight ratio sum is 100%.
As preferably, described calcia linker is the material after the limestone powder calcining, and its weight proportion and component thereof are as follows:
SiO
26.95 ~ 7.05%, Al
2O
35.30 ~ 5.70%; Fe
2O
32.0 ~ 2.4%, CaO 81.6 ~ 82.4%, MgO0.5 ~ 1.1%, and loss on ignition is 0.7 ~ 1.3%, surplus is inevitable impurity, and this calcia linker Free CaO weight percent is 55% ~ 58%.
Calcia linker is a kind of one matter through high-temperature calcination, has free calcium oxide, in the present invention, the concrete component of calcia linker is not limited to above-mentioned disclosed component and proportioning, but take above-mentioned disclosed as preferred, can wait " impact of calcining temperature and raw material granularity antagonism aquation CaO clinkersintering " of showing with reference to " aeronautical material journal " 2 interim Yuan's civilization in 1993 about the open source literature of calcia linker.
A kind of preparation method of cracking resistance swelling agent after it is characterized in that calcia linker, gypsum and dickite are clayed into power, mixes flyash and wollastonite, and mixing gets final product, above-mentioned each component and weight proportion thereof:
Calcia linker: 35% ~ 40%;
Gypsum: 15% ~ 20%;
Dickite: 30% ~ 35%;
Flyash: 5% ~ 10%;
Wollastonite powder: 2% ~ 5%,
Above-mentioned weight ratio sum is 100%.
Compared with prior art, the invention has the advantages that:
Calcia linker provides effective free calcium oxide (f-CaO for expansion, a kind of component effectively in the middle of white lime), active aluminum in the middle of it and dickite and the sulphur in the middle of gypsum form calcium sulphoaluminate in the middle of concrete, the volumetric expansion of its generation can effectively make up shrinkage that volumetric shrinkage in the middle of course of hardening and hydration heat cause and the drying shrinkage of part, the expansion sources that forms in hydration process can be stopped up the capillary hole in the middle of concrete, improve concrete compactness, thereby improve concrete waterproof and anti-permeability performance.
Because fly ash grain is the spherical ball effect that has, play lubrication, can improve mobility, cohesiveness and the water-retentivity of concrete mix, thereby improve concrete pumpability.After the effect of particularly important is the admixture fine-ground fly-ash, can reduce hydration heat of cement in concrete, the temperature that reduces under adiabatic condition raises.The a certain amount of polycarboxylate water-reducer of admixture in concrete can effectively improve mobility, the water-retentivity of concrete mix, reduces hydration heat, postpones the time of occurrence of thermal spike.
The powdered granule that wollastonite powder is a kind of white, fineness is very little.his main component is silicon and calcium, be the main innovative point of this formula and mix wollastonite powder in the middle of product, because its fineness is less, can improve concrete compactness after adding concrete, and the special molecular structure of wollastonite powder can form a kind of special netted barrier film in the middle of concrete, be evenly distributed on the surface of mortar and interior detail aggregate, make grout, aggregate, the polymkeric substance three forms complete network structure mutually, thereby obstruction capillary channel, prevent the infiltration of all kinds of etching mediums, improve concrete anti-permeability performance, corrosion-resistant property etc.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1, and in the present embodiment, the cracking resistance swelling agent adopts quality than calcia linker 37%, gypsum 18%, dickite 34%, flyash 7%, the ratio of wollastonite powder 4%, calcia linker, gypsum, dickite grinding in grinding machine arrives certain fineness, then mixes flyash and wollastonite powder.Or with calcia linker 37%, gypsum 18%, dickite 34%, flyash 7%, the ratio of wollastonite powder 4% adds that to carry out grinding in the middle of grinding machine even, and is transported to homogenizing storehouse and carries out homogenizing.Obtain this cracking resistance swelling agent.
Calcia linker in the present embodiment is the one matter of limestone powder after calcining more than 1500 ℃, and its weight proportion and component thereof are as follows: SiO
26.95%, Al
2O
35.50%; Fe
2O
32.21%, CaO 82.04%, and MgO 0.82%, and loss on ignition is 1.26%, and surplus is inevitable impurity, and this calcia linker Free CaO weight percent is 51% ~ 59%.
The volume of cracking resistance swelling agent in the middle of concrete is to account for 8% ~ 10% of gelling material in concrete mix, its mode that adds is first carried out mix with cement, coarse-fine aggregate, add again entry, duration of mixing can extend 1.5 minutes, can be by plain bumper when concrete formation or manually plug and pound the moulding of carrying out die trial, receive light, carry out maintenance under defined terms putting into after the demoulding.
After cracking resistance swelling agent in adding embodiment 1, the contraction of compensating concrete effectively, its confined expansion
The rate experimental result is as follows:
| Concrete mix | Cement | Sand | Stone | Water | Pumping agent | FA | The cracking resistance swelling agent |
| Blank | 308 | 733 | 1046 | 145 | 6.42 | 52 | |
| The cracking resistance swelling agent | 308 | 733 | 1046 | 145 | 6.42 | 52 | 40 |
It is as follows that rate of expansion detects data:
Can be found out by upper superficial expansivity data, concrete after mixing the cracking resistance swelling agent is in the situation that reasonable maintenance, and its swell value successful has effectively made up the various contractions in the middle of course of hardening, prevent the generation in all kinds of cracks, improved concrete compactness.
Carry out glue sand according to the swelling agent standard after cracking resistance swelling agent in mixing the present embodiment and detect, its detected result is as follows:
After adding the cracking resistance swelling agent, carry out glue sand limited expansion rate according to national standard and detect: its detected result is as follows:
Limited expansion rate and intensity results by top glue sand can find out, is no matter the requirement that can satisfy GB23439-2009 aspect intensity or rate of expansion after the cracking resistance swelling agent in mixing the present embodiment.
Has the function that improves compactness due to the cracking resistance swelling agent in the present embodiment, so having again preferably concrete intensity aspect, he improves, can improve the intensity of concrete (150*150 die trial) after adding 10% cracking resistance swelling agent, concrete strength detects data results and is:
The impermeability test source recording of normal concrete is as follows:
Mix the 10% concrete impermeability test source recording of cracking resistance swelling agent as follows:
Can find out from top correlation data, can effectively improve concrete intensity after adding the cracking resistance swelling agent, and improve concrete compactness, the fineness of this cracking resistance swelling agent is very little, for through the levigate mixed meal of grinding machine, does the used time in its expansion of performance, closely knit etc., can fill up the space in the middle of concrete, improve its intensity and impervious grade, its expansion effect has also compensated concrete contraction simultaneously, has played double effects.And the raising of impervious grade has had a larger raising for the antiseptic concrete performance.
Embodiment 2, and in the present embodiment, the cracking resistance swelling agent adopts quality than calcia linker 39%, gypsum 19%, dickite 33%, flyash 6%, the ratio of wollastonite powder 3%, calcia linker, gypsum, dickite grinding in grinding machine arrives certain fineness, then mixes flyash and wollastonite powder.Or with calcia linker 39%, gypsum 19%, dickite 33%, flyash 6%, the ratio of wollastonite powder 3% adds that to carry out grinding in the middle of grinding machine even, and is transported to homogenizing storehouse and carries out homogenizing.Obtain this cracking resistance swelling agent.But other reference examples 1.
Embodiment 3, and in the present embodiment, the cracking resistance swelling agent adopts quality than calcia linker 36%, gypsum 20%, dickite 34%, flyash 8%, the ratio of wollastonite powder 2%, calcia linker, gypsum, dickite grinding in grinding machine arrives certain fineness, then mixes flyash and wollastonite powder.Or with calcia linker 36%, gypsum 20%, dickite 34%, flyash 8%, the ratio of wollastonite powder 2% adds that to carry out grinding in the middle of grinding machine even, and is transported to homogenizing storehouse and carries out homogenizing.Obtain this cracking resistance swelling agent.But other reference examples 1.
Embodiment 4, and in the present embodiment, the cracking resistance swelling agent adopts quality than calcia linker 35%, gypsum 20%, dickite 30%, flyash 10%, the ratio of wollastonite powder 5%, calcia linker, gypsum, dickite grinding in grinding machine arrives certain fineness, then mixes flyash and wollastonite powder.But other reference examples 1.
Embodiment 5, and in the present embodiment, the cracking resistance swelling agent adopts quality than calcia linker 40%, gypsum 15%, dickite 35%, flyash 5%, the ratio of wollastonite powder 5%, calcia linker, gypsum, dickite grinding in grinding machine arrives certain fineness, then mixes flyash and wollastonite powder, gets final product.But other reference examples 1.
Other embodiment gained cracking resistance swelling agents have the technique effect of cracking resistance swelling agent in embodiment 1, but take embodiment 1 as preferred.
Claims (4)
1. cracking resistance swelling agent is characterized in that comprising following component and weight proportion thereof:
Calcia linker: 35%～40%;
Gypsum: 15%～20%;
Dickite: 30%～35%;
Flyash: 5%～10%;
Wollastonite powder: 2%～5%,
Above-mentioned weight ratio sum is 100%;
Described calcia linker is the material after the limestone powder calcining, and its weight proportion and component thereof are as follows:
SiO
26.95～7.05%, Al
2O
35.30～5.70%; Fe
2O
32.0～2.4%, CaO81.6～82.4%, MgO0.5～1.1%, loss on ignition is 0.7～1.3%, surplus is inevitable impurity, and this calcia linker Free CaO weight percent is 51%～59%.
2. cracking resistance swelling agent according to claim 1 is characterized in that comprising following component and weight proportion thereof:
Calcia linker: 36%～39%;
Gypsum: 18%～19%;
Dickite: 33%～34%;
Flyash: 6%～8%;
Wollastonite powder: 3%～4%,
Above-mentioned weight ratio sum is 100%.
3. the preparation method of a cracking resistance swelling agent, after it is characterized in that calcia linker, gypsum and dickite are clayed into power, mix flyash and wollastonite, and mixing gets final product, above-mentioned each component and weight proportion thereof:
Calcia linker: 35%～40%;
Gypsum: 15%～20%;
Dickite: 30%～35%;
Flyash: 5%～10%;
Wollastonite powder: 2%～5%,
Above-mentioned weight ratio sum is 100%;
Described calcia linker is the material after the limestone powder calcining, and its weight proportion and component thereof are as follows:
SiO
26.95～7.05%, Al
2O
35.30～5.70%; Fe
2O
32.0～2.4%, CaO81.6～82.4%, MgO0.5～1.1%, loss on ignition is 0.7～1.3%, surplus is inevitable impurity, and this calcia linker Free CaO weight percent is 51%～59%.
4. preparation method according to claim 3 is characterized in that each component and weight proportion thereof:
Calcia linker: 36%～39%;
Gypsum: 18%～19%;
Dickite: 33%～34%;
Flyash: 6%～8%;
Wollastonite powder: 3%～4%,
Above-mentioned weight ratio sum is 100%.
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| CN102745933B true CN102745933B (en) | 2013-11-06 |
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Cited By (1)
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| CN109650800A (en) * | 2019-02-12 | 2019-04-19 | 青岛光大集团大型构件有限公司 | A kind of lining segment concrete and preparation method thereof |
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| CN104649607B (en) * | 2014-02-09 | 2016-11-30 | 北京龙阳伟业科技股份有限公司 | A kind of preparation method of cementitious composite additive |
| CN103880320B (en) * | 2014-02-23 | 2015-08-26 | 广东湘盈建筑工程有限公司 | A kind of take dickite as the preparation method of the mineral additive of main raw material |
| CN104446081B (en) * | 2014-11-27 | 2017-01-18 | 厦门浩友建材有限公司 | Concrete expansion agent and preparation method thereof |
| CN104496244A (en) * | 2014-12-30 | 2015-04-08 | 上海申御特种建材有限公司 | Anti-crack water-proofing agent and preparation method thereof |
| CN107200500B (en) * | 2016-12-26 | 2019-12-27 | 江苏苏博特新材料股份有限公司 | Self-compacting non-shrinkage additive special for concrete filled steel tube |
| CN106938896B (en) * | 2017-03-28 | 2020-05-15 | 中交第一航务工程局有限公司 | Concrete expanding agent and preparation method and application thereof |
| CN107540258A (en) * | 2017-10-25 | 2018-01-05 | 桐城市永锦建筑工程有限公司 | A kind of concrete anticracking swelling agent |
| CN108314347A (en) * | 2018-03-07 | 2018-07-24 | 中国铁路设计集团有限公司 | The combined type for improving concrete durability and anti-crack and anti-seepage expands compacting agent |
| CN108218353A (en) * | 2018-03-23 | 2018-06-29 | 代彦霞 | A kind of high-intensity anti-cracking concrete |
| CN113563007A (en) * | 2021-07-22 | 2021-10-29 | 南京晶磊兴建材有限公司 | High-strength composite fiber expansion anti-cracking agent and preparation process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1257126C (en) * | 2004-06-15 | 2006-05-24 | 季元升 | Concrete sweller |
| CN1583646A (en) * | 2004-06-17 | 2005-02-23 | 许静 | Producing method for concrete sweller |
| CN1253399C (en) * | 2004-09-27 | 2006-04-26 | 武汉理工大学 | Cement and concrete expander prepared by using multiple industrial residues |
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| CN109650800A (en) * | 2019-02-12 | 2019-04-19 | 青岛光大集团大型构件有限公司 | A kind of lining segment concrete and preparation method thereof |
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Owner name: TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS CO Free format text: FORMER OWNER: NINGBO XINSHENG BUILDING MATERIALS DEVELOPMENT CO., LTD. Effective date: 20140714 |
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Effective date of registration: 20140714 Address after: 301502 Tianjin city Ninghe County Long Zhen Yue Long Cun Xi Yue Patentee after: TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS CO., LTD. Address before: 315800 Zhejiang city of Ningbo province Beilun xinqie Street Xu Hu Cun Xin Qi brick factory Patentee before: Ningbo Xinsheng Building Materials Development Co., Ltd. |