CN102942325B - Prestressed pipe grouting agent - Google Patents

Prestressed pipe grouting agent Download PDF

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Publication number
CN102942325B
CN102942325B CN201210429387.3A CN201210429387A CN102942325B CN 102942325 B CN102942325 B CN 102942325B CN 201210429387 A CN201210429387 A CN 201210429387A CN 102942325 B CN102942325 B CN 102942325B
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agent
content
pumping
cement
grouting
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CN102942325A (en
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刘柳奇
梁晓东
王庆国
肖映城
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Hunan Lianzhi Technology Co Ltd
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Hunan Lianzhi Bridge and Tunnel Technology Co Ltd
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Abstract

The invention discloses a prestreesed pipe grouting agent, comprsing 3.5-5% of super plasticizer, 50-70% of early expansion agent, 1-3% of middle expansion agent, 1-4% of late expansion agent, 0.25-0.75% of dispersing agent, 0.05-0.2% of NPAN, 0.1-0.3% of antifoaming agent, and 20-40% of slag. According to the invention, the industrial production process of the grouting agent is simple, the product quality is stable; by using the water with the water-cement ratio of 0.26-0.28 and the pH value of neutral to uniformly mixing, the characteristics of high fluidity, no free weepage, microdilatancy, proper setting time, high strength of set cement, etc. are achieved.

Description

A kind of pumping of prostressed duct agent
Technical field
The present invention relates to grouting agent preparation field, especially, relate to a kind of pumping of prostressed duct agent.
Background technology
Domestic, traditional grouting agent that early stage prestressed pore passage grouting is used is generally neat slurry, during construction, adopts cement, water, water reducer, swelling agent etc. to carry out scene preparation.The grouting material of on-the-spot preparation must meet: water cement ratio is 0.40~0.45, mixes appropriate water reducer, can be reduced to 0.35 water cement ratio is minimum; The maximum bleeding rate of grouting material must not surpass 3%, and bleeding should again be absorbed by mortar in 24h; The viscosity of grouting material should be controlled at 14-18s, because the viscosity of polymer mortar does not have the height of grouting material, grouting material must possess certain expansion before solidifying; The ultimate compression strength of grouting material test block is not less than 50MPa.
If adopt at the construction field (site) cement, water reducer, swelling agent, mineral admixture etc. and water preparation grouting material, conventionally have that various admixture compatibility are bad, a problem such as cement and water reducer bad adaptability, cause duct grouting to have following serious problems:
(1) poor, the poor fluidity of grouting agent slurry quality stability, flow losses are fast, and volume stability is bad;
(2) fresh paste bleeding rate is large, and in the layering of easily emanating, slurry, micro-foam is many, and mobility is bad, and time of coagulation is not moderate, during slurry mud jacking, often have some setbacks, and easily plugging, speed of application is slow, is difficult to form full state in duct;
(3) slurry eakiness after sclerosis, bubble, needle gap class space are many, unreal with presstressed reinforcing steel bonding, even have disconnected line in slurry, and duct is not full, and the outer slurry of high point plays powder etc.
The problems referred to above not only affect construction, and directly concern weather resistance and the security of bridge structure.
Summary of the invention
The object of the invention is to provide a kind of pumping of prostressed duct agent, with the technical problem such as solve existing grouting agent poor stability, poor fluidity, bleeding rate is large, space is many.
For achieving the above object, the invention provides a kind of pumping of prostressed duct agent, comprise following component and content:
High efficiency water reducing agent: 3.5~5%; Early expansion agent: 50~70%;
Mid-term swelling agent: 1~3%; Late expansion agent: 1~4%;
Dispersion agent: 0.25~0.75%; Hydrolyzed polyacrylonitrile ammonium salt: 0.05~0.2%;
Defoamer: 0.1~0.3%; Slag: 20~40%.
Preferably, described high efficiency water reducing agent is high-efficiency water-reducing agent of poly-carboxylic acid, and content is 3.8~4.5%.
Preferably, described early expansion agent is that ettringite is a kind of in swelling agent, and granularity is generally greater than 400 orders, and content is 55~66%.
Preferably, described mid-term, swelling agent was that ettringite is a kind of in swelling agent, and granularity is generally 400 order~250 orders, and content is 1.5~2.5%
Preferably, described late expansion agent is that ettringite is a kind of in swelling agent, and below general 250 orders of granularity, content is 2~3.4%.
Preferably, the content of described dispersion agent is 0.4~0.65%.
Preferably, described hydrolyzed polyacrylonitrile ammonium salt is as a kind of water retaining, and content is 0.08~0.16%.
Preferably, described defoamer is silicone antifoam agent, and content is 0.15~0.27%.
Preferably, the content of described slag is 25.2~32%.
The present invention has following beneficial effect:
1, mobility is strong: along with mixing of cement, the mobility of slurry reduces, thereby affects the velocity of flow of slurry in duct.Adding under the prerequisite that appropriate water reducer, water cement ratio are 0.26~0.28, the mobility of grouting agent of the present invention is greatly improved; Initial flow degree is 10~17s, and 30min degree of mobilization is 10~20s, and 60min degree of mobilization is 10~25s; Simultaneously, adopted dispersion agent, stability and the plastic strength of cement grout have effectively been controlled, compressive property is not reduced, 3 days ultimate compression strength and folding strength are more than or equal to respectively 20MPa and 5MPa, 7 days ultimate compression strength and folding strength are more than or equal to respectively 40MPa and 6MPa, and 28 days ultimate compression strength and folding strength are more than or equal to respectively 50MPa and 10MPa;
2, bleeding rate is low: the bleeding that slurry pours into behind duct should be absorbed by mortar as early as possible, makes to produce less in slurry process of setting air bag, density and fullness degree after the sclerosis of guarantee slurry; Grouting agent of the present invention has adopted hydrolyzed polyacrylonitrile ammonium salt, makes bleeding rate between the free bleeding rate of 24h and 3h steel wire be zero, and the pressured bleeding of 0.22MPa and 0.36MPa is all less than or equal to 2.0%;
3, time of coagulation is suitable: the presetting period is more than or equal to 5h, and final setting time is less than or equal to 24h; Be conducive to the full completely also rapid coagulation of slurry sizing;
4, swelling property is good: cement is due to reasons such as chemical shrinkage, self-constriction, dry shrinkage, can produce larger volumetric shrinkage after pouring into pipeline, and expansion component can address this problem.Grouting agent of the present invention has adopted three kinds of swelling agents (early stage, mid-term and the late period of controlling respectively cement expand), make slurry there is good compensate for shrinkage ability in the plastic stage, and after sclerosis, produce microdilatancy, 3h degree of free swelling 0~2%, 24h degree of free swelling 0~3%; Early expansion agent is because particle composition granularity is minimum, react the earliest, and its consumption is much larger than mid-term and late expansion agent, makes cement grout agitation phases in early days, just can fully mix and produce with swelling agent good compensate for shrinkage ability, successful;
5, pollution-free: starting material are taken economical convenient, and cost is lower; Employing nonpollution material is made, and is beneficial to environmental protection.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below the present invention is further detailed explanation.
Embodiment
Below embodiments of the invention are elaborated, but the multitude of different ways that the present invention can limit and cover according to claim is implemented.
The invention discloses a kind of pumping of prostressed duct agent, comprise following component and content:
High efficiency water reducing agent: 3.5~5%; Early expansion agent: 50~70%;
Mid-term swelling agent: 1~3%; Late expansion agent: 1~4%;
Dispersion agent: 0.25~0.75%; Hydrolyzed polyacrylonitrile ammonium salt: 0.05~0.2%;
Defoamer: 0.1~0.3%; Slag: 20~40%.
Wherein, high efficiency water reducing agent is to keep cement paste, mortar and concrete work degree constant and significantly reduce the admixture of its mixing water content; By disperseing cement granules, and form moisture film and the three-dimensional adsorption layer of wetting ability at particle surface, can significantly improve concrete strength, improve concrete frost resistance, impermeability, and reduce cement consumption.The high efficiency water reducing agent that the present invention uses can be high-efficiency water-reducing agent of poly-carboxylic acid.
Swelling agent, when cement setting hardens, plays compensate for shrinkage and abundant filling concrete gap, can control temperature difference crack, and reduce expenses, the reduction of erection time.Grouting agent of the present invention has adopted three kinds of swelling agents, and early stage (in 1 hour), mid-term (1~3 hour) and the later stage (in 24 hours) of controlling respectively cement expand, and make slurry have good compensate for shrinkage ability in the plastic stage.It is swelling agent that three kinds of swelling agents all belong to ettringite.
Different according to swelling agent granular size, the reaction times that participates in cement grout is also different, and in general, particle is thinner, participates in reaction faster.The granularity of the early expansion agent that the present invention adopts is generally greater than 400 orders, and mid-term, the granularity of swelling agent was 400 order~250 orders, and the granularity of late expansion agent is below 250 orders.
The early expansion agent that grouting agent of the present invention is used is because particle composition granularity is minimum, therefore react the earliest, and its consumption is much larger than mid-term and late expansion agent, make cement grout agitation phases in early days, just can fully mix and produce with swelling agent good compensate for shrinkage ability, successful.Ca(OH in cement) 2under enough conditions, middle and later periods swelling agent is that cement-based material supplements sulfate radical and aluminate ion, promote ettringite to form, because middle and later periods swelling agent particle composition granularity is larger, react more late, make cement grout still can produce certain expansion after being pressed into prestress pipe, thus the gap between steel strand in abundant filling prestress pipe.
Dispersion agent main component is montmorillonite, content is more than or equal to 60%~88%, there is certain viscosity, thixotropy and oilness, can effectively disperse with suspension slurry in cement granules, improve the stability of cement grout, be conducive to reduce the pressure bleeding of slurries, and play the effect of refinforced cement stone plastic strength.
Hydrolyzed polyacrylonitrile ammonium salt is line style water soluble polymer, is the amide group (CONH being obtained by polyacrylonitrile hydrolyzed 2) polyelectrolyte different from carboxylic sodium base (COONa) ratio, the mechanism of action of hydrolyzed polyacrylonitrile ammonium salt, the one, be it can not ionize and wetting ability is poor amide group and itrile group, by hydrogen bond, connect, cement granules is produced to adsorption; The 2nd, it produces ionization hydration with the cement granules that makes of the strong carboxylic sodium base of wetting ability, forms absorption hydration layer; The 3rd, as polymer, it can make cement granules be adsorbed on its chain link, forms macromolecular structure provide protection.These three kinds of coalescent stabilizations make cement granules in slurries, keep disperseing and are stable, fetter more free liquid simultaneously, and polymer plays and hinders the effect that the free water in cement slurry loses from filtering layer, therefore hydrolyzed polyacrylonitrile ammonium salt can play the effect of falling dehydration and tackify.
Defoamer significantly reduces the surface tension of foam, or destroys film elasticity, causes bubble-break, and antifoaming speed is fast, press down the bubble time long, nontoxic, corrosion-free, without adverse side effect.
Slag strengthens the intensity of mud jacking material.
Effectively stress transmission between mud jacking material when grouting agent of the present invention is the girder pre-stressed pipeline pack of posttension, the burn into assurance prestressing tendon that prevents prestressing steel and concrete structure; Applicable to working-yards such as the anchor grouting of the girder pre-stressed pipeline pack mud jacking of posttension, earth anchor system, Equipment Foundations grouting, the grouting of high-strength steel prestressed concrete member hole, road bridge strengthenings; Grouting agent water mixing mud can be hybridly prepared into grouting material uses.
The concrete formula of the present invention can see the following form shown in 1.
According to above-mentioned formula composition and content range (embodiment 6 and embodiment 8) thereof, make test group 1 of the present invention and 2, mix the mud jacking material property that forms after cement and water respectively in Table 2 and table 3.
Table 2 test group 1 detected result
Table 3 test group 2 detected results
From upper table, find out, adding under the prerequisite that appropriate water reducer, water cement ratio are 0.26~0.28, the mobility of grouting agent of the present invention is greatly improved; Initial flow degree is 10~17s, and 30min degree of mobilization is 10~20s, and 60min degree of mobilization is 10~25s; Simultaneously, adopted dispersion agent, stability and the plastic strength of cement grout have effectively been controlled, compressive property is not reduced, 3 days ultimate compression strength and folding strength are more than or equal to respectively 20MPa and 5MPa, 7 days ultimate compression strength and folding strength are more than or equal to respectively 40MPa and 6MPa, and 28 days ultimate compression strength and folding strength are more than or equal to respectively 50MPa and 10Mpa; Adopted hydrolyzed polyacrylonitrile ammonium salt, made bleeding rate between the free bleeding rate of 24h and 3h steel wire be zero, the pressured bleeding of 0.22MPa and 0.36MPa is all less than or equal to 2.0%.
The most outstanding, the swelling agent that adopts three kinds of grain graininess to vary in size, makes grouting agent 3h degree of free swelling 0~2% of the present invention, 24h degree of free swelling 0~3%; For concrete, pour into the volumetric shrinkage producing after pipeline and produce suitable microdilatancy, intensity index is greatly improved.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (9)

1. a pumping of prostressed duct agent, is characterized in that, comprises following component:
Described early expansion agent is that ettringite is swelling agent, and granularity is greater than 400 orders.
2. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, described high efficiency water reducing agent is high-efficiency water-reducing agent of poly-carboxylic acid, and content is 3.8~4.5%.
3. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, described early expansion agent content is 55~66%.
4. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, described mid-term, swelling agent was that ettringite is swelling agent, and granularity is 400 order~250 orders, and content is 1.5~2.5%.
5. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, described late expansion agent is that ettringite is swelling agent, and granularity is below 250 orders, and content is 2~3.4%.
6. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, the content of described dispersion agent is 0.4~0.65%.
7. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, described hydrolyzed polyacrylonitrile ammonium salt is as a kind of water retaining, and content is 0.08~0.16%.
8. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, described defoamer is silicone antifoam agent, and content is 0.15~0.27%.
9. a kind of pumping of prostressed duct agent according to claim 1, is characterized in that, the content of described slag is 25.2~32%.
CN201210429387.3A 2012-11-01 2012-11-01 Prestressed pipe grouting agent Active CN102942325B (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104003639A (en) * 2014-05-09 2014-08-27 中国铁道科学研究院铁道建筑研究所 Overall-process anti-shrink agent for cement-based material and preparation method thereof
CN105271890B (en) * 2015-10-23 2017-07-18 武汉比邻科技发展有限公司 A kind of prestress hole path pressure grouting agent and its preparation and application

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101817656A (en) * 2009-02-26 2010-09-01 北京东方雨虹防水技术股份有限公司 Post stressed concrete beam pipe mudjacking agent
JP2011102222A (en) * 2009-11-11 2011-05-26 Construction Research & Technology Gmbh High fluid and high strength grout material
CN102584101A (en) * 2012-01-20 2012-07-18 南京瑞迪高新技术有限公司 Special grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts and preparation method thereof
CN102604604A (en) * 2012-02-06 2012-07-25 北京探矿工程研究所 Drilling fluid material, preparation thereof and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101817656A (en) * 2009-02-26 2010-09-01 北京东方雨虹防水技术股份有限公司 Post stressed concrete beam pipe mudjacking agent
JP2011102222A (en) * 2009-11-11 2011-05-26 Construction Research & Technology Gmbh High fluid and high strength grout material
CN102584101A (en) * 2012-01-20 2012-07-18 南京瑞迪高新技术有限公司 Special grouting agent for post-tensioned prestressed concrete beams of highway bridges and culverts and preparation method thereof
CN102604604A (en) * 2012-02-06 2012-07-25 北京探矿工程研究所 Drilling fluid material, preparation thereof and application thereof

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Denomination of invention: Prestressed pipe grouting agent

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Granted publication date: 20140129

Pledgee: Bank of Beijing Limited by Share Ltd Changsha branch

Pledgor: Hunan Lianzhi Bridge and Tunnel Technology Co.,Ltd.

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Address after: 410200 No. 168, Second Section of Yanhe Road, Wangcheng Economic and Technological Development Zone, Changsha City, Hunan Province

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Address before: 42, building 17, Xiang Xin century town, No. 410015 Kaiyuan Road, Changsha Economic Development Zone, Hunan, China

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