CN102030492A - Anti-cracking agent for plastic shrinkage cracks of pumping concrete - Google Patents
Anti-cracking agent for plastic shrinkage cracks of pumping concrete Download PDFInfo
- Publication number
- CN102030492A CN102030492A CN2010105342863A CN201010534286A CN102030492A CN 102030492 A CN102030492 A CN 102030492A CN 2010105342863 A CN2010105342863 A CN 2010105342863A CN 201010534286 A CN201010534286 A CN 201010534286A CN 102030492 A CN102030492 A CN 102030492A
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- Prior art keywords
- concrete
- pumping concrete
- plastic shrinkage
- cracking agent
- cracks
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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
The invention provides an anti-cracking agent for plastic shrinkage cracks of pumping concrete, and belongs to the technical field of concrete admixtures. The anti-cracking agent for the plastic shrinkage cracks of the pumping concrete can effectively prevent the plastic shrinkage cracks of the pumping concrete and is low in price. The anti-cracking agent is prepared by evenly mixing the following raw materials in percentage by weight: 96.5-99.5% of natural alunite powder or natural gypsum powder and 0.5-3.5% of organic fiber with the length of 10-20mm. In the invention, the anti-cracking agent can be blended into the pumping concrete, which can improve the strength of the pumping concrete, ensure the quality of the pumping concrete, avoid the plastic cracks of the pumping concrete, and reduce dry cracks and temperature cracks, thus the anti-cracking agent has the advantages of high economic benefit and high social benefit.
Description
Technical field
The present invention relates to a kind of pump concrete plastic shrinkage cracks anti-fissuring agent, belong to technical field of concrete additives.
Background technology
Concrete shrinkage crack has plastic crack, dry crack and thermal cracking.Pump concrete is the concrete of little water cement ratio high slump, and non-pump concrete is the concrete of the little slump of big water cement ratio, and therefore, the shrinking percentage of pump concrete is bigger by about 30% than non-pump concrete.To conventional design; do not do super-long structural and do not need engineerings such as the dwelling house of waterproof and Highrise buildings floor yet; using pump concrete is to have a large capacity and a wide range; because it is many to produce the cement type of pump concrete stirring station application; cement fineness, chemical ingredients performance are different; reasons such as the temperature the when adaptability of the silt content that thickness is gathered materials, concrete proportioning, use admixture and construction, the thickness of protective layer, the eakiness of vibrating and cast back maintenance are bad; it is very general to produce the pump concrete plastic shrinkage cracks, accounts for pump concrete and produces fissured 50%.The pump concrete plastic crack generally produces before concrete final set, just can observe about 24 hours after the concrete depositing usually.The crack appears at the surface of structure, also occurs the bottom surface in structure, and shape is very irregular, and is different in size, and is discontinuous mutually.The penetration of fracture is at the end face of reinforcing bar, so reinforcing bar is inoperative to the control of pump concrete plastic shrinkage cracks.Though these cracks do not influence the globality of structure, if do not handle, steel bar corrosion is harmful to, have a strong impact on the weather resistance and the work-ing life of buildings.To designing the pump concrete engineering of not doing super-long structural and not needing waterproof, do not need to mix swelling agent, because of expansive agent dosage is big, generally to mix 8-10%, the expense height.One cube of pump concrete expense is to increase dozens of yuan, and singly mixes swelling agent to preventing the generation of pump concrete plastic crack, facts have proved that its effect is also undesirable.Other has the report that singly is mixed with organic fiber in pump concrete, but because concrete mixing plant is not mixed fine equipment specially, can only go into stirrer with manually mixing on belt simultaneously with sandstone from the sandstone rotary conveyor, so it is agglomerating easily, in pump concrete, cause the Fiber Distribution inequality, and mix on belt, run into situations such as wind is arranged and then easily run off, influence the volume precision.
Summary of the invention
The object of the present invention is to provide a kind ofly can effectively prevent the pump concrete plastic shrinkage cracks, and cheap, be easy to evenly mix, volume pump concrete plastic shrinkage cracks anti-fissuring agent accurately.
Its technical scheme is: a kind of pump concrete plastic shrinkage cracks anti-fissuring agent, it is characterized in that it is mixed by following raw material components and weight percent thereof makes: native alum stone flour or natural gesso 96.5-99.5, the organic fibre 0.5-3.5 of 10-20mm length.
Above-mentioned organic fibre is polyethylene fibre, polypropylene fibre, modified polyethylene fiber or modified polypropylene fiber.
The volume of above-mentioned anti-fissuring agent is the 1-6% of gelating material amount in the pump concrete.
Its technique effect is: anti-fissuring agent of the present invention, owing to contain chemical ingredientss (seeing the following form 1,2) such as sulphur trioxide in native alum stone flour that adopts or the natural gesso, so its with cement in Calucium Silicate powder hydration reaction generation ettringite, behind the pump concrete water seasoning, have self-healing performance, thus the minute crack closure that can produce pump concrete; And the organic fibre that is blended in alum stone flour or the terra alba can play the effect that stops progress of fracture and delay the crack appearance to the pump concrete plastic crack; Simultaneously, contain chemical ingredientss such as aluminium sesquioxide and calcium oxide in alunite and the gypsum, it is mixed with organic fibre to mix to improve concrete crushing strength and bending strength in the pump concrete, and can equivalent save cement, reduce the expense of using anti-fissuring agent; In addition, China's natural alumstone and plaster of paris aboundresources, material be easy to get and cost cheap, with the anti-fissuring agent that organic fibre is mixed and made into, can substitute the concrete active admixture of pumping, can send into the silo of concrete mixing plant, be easy to realize automatic gauge control, directly drop in the stirrer, reduce the expense of manually mixing, and not conglomeration when stirring is evenly distributed.Therefore, adopt anti-fissuring agent of the present invention, both improved the intensity of pump concrete, guaranteed the quality (seeing the following form 3,4) of pump concrete, prevent the plastic crack of pump concrete again, reduced the generation of dry crack and thermal cracking, had very high economic benefit and social benefit.
Natural alumstone chemical ingredients (table 1)
| Title | Sio 2 | Al 2o 3 | Fe 2o 3 | Cao | Mgo | So 3 | K 2o | Na 2o |
| ％ | 15-50 | 14-22 | 2.5-3.5 | 1.5-2 | 0.2-0.4 | 14-18 | 3-4 | 0.1-0.4 |
Plaster of paris chemical ingredients (table 2)
| Title | Sio 2 | Al 2o 3 | Fe 2o 3 | ?Cao | Mgo | So 3 | Crystal water |
| ％ | 0.5-1.5 | 0.16-0.36 | Trace | ?32-40 | 0.2-0.8 | 40-50 | 19-21 |
The cement mortar strength (table 3) of alunite and the compound anti-fissuring agent of polyethylene organic fibre
The cement mortar strength (table 4) of gypsum and the compound anti-fissuring agent of polypropylene organic fibre
Embodiment
Embodiment 1.Get and essentially identical native alum stone flour of cement fineness or natural gesso 96.5kg, the polypropylene fibre 3.5kg of 10-20mm length mixes, and promptly gets pump concrete plastic shrinkage anti-fissuring agent.
Embodiment 2.Get and essentially identical native alum stone flour of cement fineness or natural gesso 97.5kg, the polyethylene fibre 2.5kg of 10-20mm length mixes, and promptly gets pump concrete plastic shrinkage anti-fissuring agent.
Embodiment 3.Get and essentially identical native alum stone flour of cement fineness or natural gesso 99.5kg, the modified polypropylene fiber 0.5kg of 10-20mm length mixes, and promptly gets pump concrete plastic shrinkage anti-fissuring agent.
Claims (3)
1. pump concrete plastic shrinkage cracks anti-fissuring agent is characterized in that it is mixed by following raw material components and weight percent thereof to make: native alum stone flour or natural gesso 96.5-99.5, the organic fibre 0.5-3.5 of 10-20mm length.
2. pump concrete plastic shrinkage cracks anti-fissuring agent according to claim 1 is characterized in that: described organic fibre is polyethylene fibre, polypropylene fibre, modified polyethylene fiber or modified polypropylene fiber.
3. pump concrete plastic shrinkage cracks anti-fissuring agent according to claim 1 is characterized in that: the volume of described anti-fissuring agent is the 1-6% of gelating material amount in the pump concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105342863A CN102030492A (en) | 2010-11-03 | 2010-11-03 | Anti-cracking agent for plastic shrinkage cracks of pumping concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105342863A CN102030492A (en) | 2010-11-03 | 2010-11-03 | Anti-cracking agent for plastic shrinkage cracks of pumping concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102030492A true CN102030492A (en) | 2011-04-27 |
Family
ID=43884015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105342863A Pending CN102030492A (en) | 2010-11-03 | 2010-11-03 | Anti-cracking agent for plastic shrinkage cracks of pumping concrete |
Country Status (1)
| Country | Link |
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| CN (1) | CN102030492A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103641348A (en) * | 2013-12-11 | 2014-03-19 | 安徽城建检测科技有限公司 | Pump concrete cement admixture |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590473A (en) * | 2003-09-02 | 2005-03-09 | 天津市塘沽区天虹化工涂料装饰有限公司 | Anticracking agent for outer wall beat insulating anticracking water proofing coating material and its preparation method |
| CN1844023A (en) * | 2006-04-20 | 2006-10-11 | 上海交通大学 | Anti-cracking agent for mortar |
| CN101143769A (en) * | 2007-08-31 | 2008-03-19 | 江西武冠新材料股份有限公司 | Three expansion source concrete anti-cracking agent (CMA) |
| CN101172808A (en) * | 2007-10-25 | 2008-05-07 | 南京派尼尔科技实业有限公司 | High crack-proof, impervious composite material for concrete and producing method thereof |
| CN101805143A (en) * | 2010-03-12 | 2010-08-18 | 同济大学 | Anti-interference anticracking agent for concrete and preparation method thereof |
-
2010
- 2010-11-03 CN CN2010105342863A patent/CN102030492A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1590473A (en) * | 2003-09-02 | 2005-03-09 | 天津市塘沽区天虹化工涂料装饰有限公司 | Anticracking agent for outer wall beat insulating anticracking water proofing coating material and its preparation method |
| CN1844023A (en) * | 2006-04-20 | 2006-10-11 | 上海交通大学 | Anti-cracking agent for mortar |
| CN101143769A (en) * | 2007-08-31 | 2008-03-19 | 江西武冠新材料股份有限公司 | Three expansion source concrete anti-cracking agent (CMA) |
| CN101172808A (en) * | 2007-10-25 | 2008-05-07 | 南京派尼尔科技实业有限公司 | High crack-proof, impervious composite material for concrete and producing method thereof |
| CN101805143A (en) * | 2010-03-12 | 2010-08-18 | 同济大学 | Anti-interference anticracking agent for concrete and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 金树青，沈熙佐: "明矾石膨胀剂在建筑工程上的应用", 《建筑机械化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103641348A (en) * | 2013-12-11 | 2014-03-19 | 安徽城建检测科技有限公司 | Pump concrete cement admixture |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 103, room 121, 1, Swan Lake Road, 230000, Anhui, Hefei province (Xuhui Park) Applicant after: Jin Shuqing Applicant after: Shen Xizuo Address before: 230001 Ring Road in Anhui city of Hefei province No. 28 building 23 room 506 Applicant before: Jin Shuqing Applicant before: Shen Xizuo |
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110427 |