CN102399067A - Concrete expansive agent - Google Patents
Concrete expansive agent Download PDFInfo
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- CN102399067A CN102399067A CN2010102787992A CN201010278799A CN102399067A CN 102399067 A CN102399067 A CN 102399067A CN 2010102787992 A CN2010102787992 A CN 2010102787992A CN 201010278799 A CN201010278799 A CN 201010278799A CN 102399067 A CN102399067 A CN 102399067A
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Abstract
The invention discloses a concrete expansive agent and relates to a building material. The concrete expansive agent consists of the following components in part by weight: 44 to 60 parts of raw gypsum powder, 12 to 25 parts of bauxite cement, 1 to 3 parts of polypropylene fiber, 8 to 10 parts of fly ash and 17 to 20 parts of calcium carbonate powder. The concrete expansive agent has the advantages that: 1, a compounding technology is simple and feasible; 2, the mixing amount is small, the content of alkali is low, the compressive strength is high, the expansive stability is high, after expansion has a good effect, and shrinkage in after expansion can be effectively prevented to achieve the volume stability of the concrete; and 3, compared with other expansive agent products, the concrete expansive agent has smaller slump loss and lower price.
Description
Technical field
The present invention relates to material of construction, especially a kind of swelling agent that adds when being used for concrete for making.
Technical background
In recent years, the concrete technology of China development rapidly, but the probability that outstanding contradiction is engineering cracks to be occurred significantly increasing, and harmful crack and structure durability have direct relation, this has caused showing great attention to of civil engineering field and relevant department.
Generally speaking, the crack that concrete produces produces with regard to it that reason has concrete because self contract certainly, drying shrinkage, shrinkage, the crack that also has, construction technology stressed because of concrete structure and flow process to cause.Though the crack of buildings is inevitable, its deleterious degree can be controlled fully.
With regard to current domestic and international solution concrete cracking, the effective way of seepage; Except daily reasonable material and proportioning design and concrete construction process; The main rigid waterproofing technology that adopts; Add buildings overlong jointless structural design construction technique, this just requires concrete to have the function of microdilatancy, cracking resistance and antiseep.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of prescription, produces the cement expansive material of microdilatancy, cracking resistance, antiseep easily.
The technical scheme that the object of the invention adopted is, is made up of gypsum powder, high-alumina cement, polypropylene fibre, flyash, Paris white, and it is formed by weight being:
Gypsum powder 44-60 part
High-alumina cement 12-25 part
Polypropylene fibre 1-3 part
Flyash 8-10 part
Paris white 17-20 part.
The present invention by weight ratio, drops into above-mentioned gypsum powder, high-alumina cement, polypropylene fibre, flyash, Paris white jointly in the mixing machine and fully stirred 30 minutes, promptly can be made into a kind of cement expansive material.
After the present invention added concrete; A large amount of swelling property crystallization hydrate---the aquation calcium sulphoaluminate is an ettringite with generating; Make concrete produce the microdilatancy of appropriateness; The counteracted by pressure that produced of utilize expanding its owing to concrete from the tensile stress that contracts, drying shrinkage, shrinkage produce, thereby concrete contraction is compensated, prevent or reduce crack on concrete.Simultaneously, cram the pore seam of inside concrete during the calcium sulphoaluminate postscript produced in the reaction process, improved concrete density and impermeability, reached good waterproof effect.Contain certain polypropylene fibre in this new concrete swelling agent, fiber can effectively suppress the crack on concrete process in concrete, improved concrete fracture toughness property.Be evenly distributed in the concrete fiber of phase adhesion each other and played the effect of " support " aggregate; The bleed of concrete surface and the segregation that gathers materials have been reduced; Thereby effectively improved concrete impervious ability, moreover the Young's modulus of polypropylene fibre is lower; It makes, and genetic defects reduces in the concrete, and micro-property improves.
The present invention has:
1, simple compounded technology is innovated on prescription, and the technology of high energy consumption, high pollution such as broken calcination traditionally, mill is a kind of typical practical technique.
2, volume is low, and alkali content is low, and ultimate compression strength is high, the expansible good stability, and the late expansion performance is good, can effectively improve late expansion and not produce retraction to reach concrete volume stability.
3, be used for pump concrete technology, compare with other swelling agent products, slump-loss is littler, and price is more preferential.
Embodiment
Further specify the present invention below in conjunction with embodiment.
Gypsum powder specific surface area used in the present invention/(m
2/ kg)>=200,1.18mm tails over/%≤0.5; Flyash reaches the second class powered coal ash standard; Polypropylene fibre length is 6-10mm, diameter 18-35 μ m, density 0.9g/cm
3, tensile strength is 600Mpa; The label of high-alumina cement is 525; The water ratio of Paris white≤3%, specific surface area/(m
2/ kg)>=200,1.18mm tails over/%≤0.5.
Cement expansive material is put into concrete by 6% of cement consumption, and the microdilatancy that can make concrete produce appropriateness utilizes the pressure that expands and produced; Offset its owing to concrete from the tensile stress that contracts, drying shrinkage, shrinkage produce; Thereby concrete contraction is compensated, prevents or reduced cracking, crammed the pore seam of inside concrete during the calcium sulphoaluminate postscript that produces in the reaction process simultaneously; Concrete degree of compactness and impermeability have been improved; Polypropylene fibre in this swelling agent can effectively suppress the crack on concrete process in concrete, improved concrete fracture toughness property.Through detecting, each item performance index have all reached " cement expansive material " standard of GB23439-2009, and concrete data are following:
Claims (1)
1. a cement expansive material is made up of gypsum powder, high-alumina cement, polypropylene fibre, flyash, Paris white, it is characterized in that forming by weight being:
Gypsum powder 44-60 part
High-alumina cement 12-25 part
Polypropylene fibre 1-3 part
Flyash 8-10 part
Paris white 17-20 part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102787992A CN102399067A (en) | 2010-09-10 | 2010-09-10 | Concrete expansive agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102787992A CN102399067A (en) | 2010-09-10 | 2010-09-10 | Concrete expansive agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102399067A true CN102399067A (en) | 2012-04-04 |
Family
ID=45881776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102787992A Pending CN102399067A (en) | 2010-09-10 | 2010-09-10 | Concrete expansive agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102399067A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402283A (en) * | 2014-10-31 | 2015-03-11 | 桂林华越环保科技有限公司 | Concrete expanding agent |
| CN104446092A (en) * | 2014-11-04 | 2015-03-25 | 张桂华 | Concrete expansive agent |
| CN104529215A (en) * | 2014-12-17 | 2015-04-22 | 武汉三源特种建材有限责任公司 | Phosphogypsum expanding agent and preparation method thereof |
| CN106938896A (en) * | 2017-03-28 | 2017-07-11 | 中交第航务工程局有限公司 | A kind of cement expansive material and preparation method and application |
| CN107188446A (en) * | 2017-06-27 | 2017-09-22 | 常州西夏墅东方工具有限公司 | A kind of cement expansive material and preparation method thereof |
| CN112209649A (en) * | 2019-07-11 | 2021-01-12 | 陈金权 | Composite double-fiber anti-cracking anti-seepage agent |
-
2010
- 2010-09-10 CN CN2010102787992A patent/CN102399067A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104402283A (en) * | 2014-10-31 | 2015-03-11 | 桂林华越环保科技有限公司 | Concrete expanding agent |
| CN104446092A (en) * | 2014-11-04 | 2015-03-25 | 张桂华 | Concrete expansive agent |
| CN104529215A (en) * | 2014-12-17 | 2015-04-22 | 武汉三源特种建材有限责任公司 | Phosphogypsum expanding agent and preparation method thereof |
| CN106938896A (en) * | 2017-03-28 | 2017-07-11 | 中交第航务工程局有限公司 | A kind of cement expansive material and preparation method and application |
| 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 |
| CN107188446A (en) * | 2017-06-27 | 2017-09-22 | 常州西夏墅东方工具有限公司 | A kind of cement expansive material and preparation method thereof |
| CN112209649A (en) * | 2019-07-11 | 2021-01-12 | 陈金权 | Composite double-fiber anti-cracking anti-seepage agent |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120404 |