CN102432232A - Light aggregate micro expansion anti-crack concrete - Google Patents
Light aggregate micro expansion anti-crack concrete Download PDFInfo
- Publication number
- CN102432232A CN102432232A CN2010102970150A CN201010297015A CN102432232A CN 102432232 A CN102432232 A CN 102432232A CN 2010102970150 A CN2010102970150 A CN 2010102970150A CN 201010297015 A CN201010297015 A CN 201010297015A CN 102432232 A CN102432232 A CN 102432232A
- Authority
- CN
- China
- Prior art keywords
- concrete
- crack
- aggregate
- cement
- percent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention discloses light aggregate micro expansion anti-crack concrete, which is prepared from cement, aggregate, expansion agents and water at a mixed ration with the pressure resistance intensity lower than 100 MPa through being mixed and stirred. The light aggregate with the same volume is used for replacing partial aggregate at the replacement rate being 15 percent to 100 percent, wherein the tube pressure intensity of the used light aggregate is not greater than 100 MPa, the consumption of the expansion agents added into per cubic meter of concrete is not more than 20 percent of the cement consumption, and in addition, the water cement ratio is maintained to be in a range being 25 to 75 percent. The light aggregate micro expansion anti-crack concrete has the advantages that on the premise of meeting various kinds of use performance of the concrete, the internal pulling stress caused by temperature contraction and self generated contraction in the concrete is effectively reduced, and the cracks generated by the reason can be effectively controlled, so the crack gaps generated in the concrete is reduced, and the crack number is reduced. Particularly, the anti-crack concrete has the obvious effect on large-size concrete structures with large cross section area and concrete structures in various sizes with the unit cement consumption in the normal range.
Description
Technical field
The present invention relates to a kind of new concrete of building material field; Can effectively reduce the inside tensile stress that causes by temperature contraction and spontaneous contraction in the concrete; Consequent cracking can receive effective control, makes that the gap, crack that occurs in the concrete is able to reduce, crack quantity is minimized.
Background technology
The cracking problem that produces in the concrete is to be risen and temperature descends and the reasons such as temperature deformation that take place cause by the concrete temperature that spontaneous contraction, hydration reaction process that dry shrinkage, hydration reaction that mixing water evaporation causes cause cause.
Temperature deformation is the heat release volumetric shrinkage that the volumetric expansion cause and loss of heat afterwards lower the temperature and cause that heats up in the hydrated reaction of cement process.Especially the large-sized concrete works that cross-sectional area is bigger; Though but and the little more concrete structure of unit volume cement consumption of cross-sectional area, because liberated heat discharges and slowly makes temperature deformation be easy to generation in the hydration reaction process of cement.Simultaneously, concrete self is owing to inner aquation reaction consumes part mixing water causes relatively dry, in the effect lower volume of capillary attraction spontaneous contraction takes place, under the influence that temperature raises, and this contraction accelerated growth.In addition; Inside concrete is not participated in the remaining moisture of hydration reaction, after concrete hardening, reaches in the process of several years to be lost to gradually in the ambient air, further aggravates the effect of inner capillary attraction; Cause bigger contraction, this contraction is called as dry shrinkage.These three kinds of contractions are to cause fissured major cause to occur, since all relevant with temperature, so-called temperature cracking problem be referred to as.
Various method that is used to suppress concrete cracking appearred in the past, as adding swelling agent, economization agent, steel fiber etc.According to practical experience, the cracking resistance effect is all undesirable.This is because swelling agent and economization agent can only be alleviated spontaneous contraction, and can not effectively eliminate the influence that temperature is shunk; Steel fiber also is not enough to offset the tensile stress that contraction causes to the help of tensile strength.
Though aforesaid method is to the spontaneous contraction that reduces self-desiccation and cause and to suppress the cracking that spontaneous contraction causes effective to a certain extent, the rimose generation that above-mentioned temperature deformation is caused and the appearance of inner tensile stress can not effectively prevent.
Summary of the invention
To the problems referred to above, the present invention aims to provide a kind of light skeletal microdilatancy cracking resistance concrete.
For realizing this technical purpose; Scheme of the present invention is: a kind of light skeletal microdilatancy cracking resistance concrete; Prepare with the proportioning of ultimate compression strength below 100MPa by cement, aggregate, swelling agent and water; Mix together, with isopyknic light skeletal replacement part aggregate, replacement rate is 15%-100%.
As further improvement, the light skeletal cylindrical compress strength that uses in the said concrete is not more than 100MPa.
As improvement further, said concrete wc is in the 25-75% scope.
As improvement further, add in every cubic meter of concrete of using in the said concrete swelling agent the no more than cement consumption of consumption 20%.
The cracking resistance concrete that the present invention proposes, when hydrated reaction of cement caused that temperature rises, swelling agent and water generation chemical reaction produced and expand, and made the low light skeletal of ratio of rigidity general aggregate that bigger elastic compression take place.Like this,, replace the 15-100% of whole coarse aggregate volumes, can when concrete temperature rises, make light skeletal produce certain elastic compression distortion with this light skeletal for the concrete mix of ultimate compression strength below 100MPa.Then; Cause in the process of volume of concrete contraction in temperature decline; The distortion of the elastic compression of this light skeletal can recover, because this distortion can the partial offset hardened cement paste and the shrinkage strain of sclerosis mortar, so temperature contraction distortion is eased.And then the concrete cracking that is caused by temperature deformation can be inhibited.
Also have, for the concrete mix of ultimate compression strength below 100MPa, replace the 15-100% of whole coarse aggregate volumes with light skeletal, this light skeletal can be brought into play the function of storage moisture well.Moisture can be stored in the inner space of light skeletal, in course of hardening, slowly discharges water and offer swelling agent to react.Therefore, when temperature descended, this light skeletal continued to provide the swelling agent expansion that moisture causes and the hydration reaction of cement to combine, and can make expansion continue to carry out, and performance further reduces the effect that temperature is shunk.
Embodiment
Concrete of the present invention is mixed together by cement, aggregate, swelling agent and water, and with the proportioning preparation of ultimate compression strength below 100MPa, with isopyknic light skeletal replacement part aggregate, replacement rate is 15%-100%.
The light skeletal of mentioning among the present invention is a light skeletal commonly used in the concrete production, that widely be familiar with.Method to making this light skeletal does not have particular restriction; For example; Through materials such as water collection slag, obsidian are carried out the granularity adjustment; Add whipping agent etc. in case of necessity and carry out foamable and form inorganic foamed body, perhaps materials such as foamed glass, scrap glass are pulverized, then the glass powder that forms after the adjustment granularity is carried out foaming treatment.In addition, be not only artificial light skeletal, natural weight aggregate also can use.
The over dry density of the light skeletal of mentioning among the present invention is 1.2-2.0g/cm
3, cylindrical compress strength is 50-100MPa, and is wherein even more ideal with 60-90MPa.For reaching ideal effect, light skeletal accounts for the ratio of aggregate volume in the concrete should be greater than 25%.In addition, the particle diameter of light skeletal is not had particular requirement, be used for coarse aggregate or fine aggregate can.Whether to doing in advance immersion treatment does not require, no matter how many water cut of light skeletal is can use.
As long as the swelling agent of mentioning among the present invention can expand in hydration reaction, which kind of mechanism that don't work all is suitable for.For reaching better effects, 20% of the no more than cement consumption of consumption of every cube of this swelling agent of concrete is advisable below using 60kg, and is even more ideal during 25-45kg.
The cement type that the present invention mentions does not have particular requirement; Common, compounds such as various portland cements, blast-furnace slag powder, flyash, silicon ash, limestone powder such as morning is strong, ultra morning is strong, low-heat, middle heat, anti-vitriol, the cement that forms with the arbitrary proportion mixing can be suitable for.
The concrete of mentioning among the present invention is the concrete with the proportioning preparation of ultimate compression strength below 100MPa, and is wherein even more ideal for the concrete effect of ultimate compression strength 20-60MPa.For reaching the compensation temperature deformation effect and suppressing the temperature cracking effect, concrete wc should be in the scope of 35-65%.Under the prerequisite that does not influence result of use of the present invention, can combine mixing materials such as additive such as water reducer, high-performance water reducing agent and blast-furnace slag powder, flyash to use.
The above; Be merely preferred embodiment of the present invention; Not in order to restriction the present invention, every foundation technical spirit of the present invention to any trickle modification that above embodiment did, be equal to replacement and improve, all should be included within the protection domain of technical scheme of the present invention.
Claims (4)
1. light skeletal microdilatancy cracking resistance concrete;, mix together with the proportioning preparation of ultimate compression strength below 100MPa by cement, aggregate, swelling agent and water, it is characterized in that; With isopyknic light skeletal replacement part aggregate, replacement rate is 15%-100%.
2. light skeletal microdilatancy cracking resistance concrete according to claim 1 is characterized in that the light skeletal cylindrical compress strength that uses in the said concrete is not more than 100MPa.
3. light skeletal microdilatancy cracking resistance concrete according to claim 2 is characterized in that said concrete wc is in the 25-75% scope.
4. according to each described light skeletal microdilatancy cracking resistance concrete in the claim 1 to 3, it is characterized in that, add in every cubic meter of concrete of using in the said concrete swelling agent the no more than cement consumption of consumption 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102970150A CN102432232A (en) | 2010-09-29 | 2010-09-29 | Light aggregate micro expansion anti-crack concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102970150A CN102432232A (en) | 2010-09-29 | 2010-09-29 | Light aggregate micro expansion anti-crack concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102432232A true CN102432232A (en) | 2012-05-02 |
Family
ID=45980628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102970150A Pending CN102432232A (en) | 2010-09-29 | 2010-09-29 | Light aggregate micro expansion anti-crack concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102432232A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108558330A (en) * | 2018-05-22 | 2018-09-21 | 武汉源锦建材科技有限公司 | A kind of tunnel-liner vault band mould grouting microdilatancy grout material |
| CN114524682A (en) * | 2022-03-02 | 2022-05-24 | 林志海 | Lightweight aggregate micro-expansion anti-cracking concrete with adjustable expansion performance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234876A (en) * | 2008-02-29 | 2008-08-06 | 武汉理工大学 | Method for preparing antiskid wearable lightweight steel box girder bridge floor paving layer |
| CN101337799A (en) * | 2008-08-05 | 2009-01-07 | 吴秋森 | Light wall board for partition of buildings and method for preparing same |
-
2010
- 2010-09-29 CN CN2010102970150A patent/CN102432232A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101234876A (en) * | 2008-02-29 | 2008-08-06 | 武汉理工大学 | Method for preparing antiskid wearable lightweight steel box girder bridge floor paving layer |
| CN101337799A (en) * | 2008-08-05 | 2009-01-07 | 吴秋森 | Light wall board for partition of buildings and method for preparing same |
Non-Patent Citations (1)
| Title |
|---|
| 彭家惠 等: "EPS外保温砂浆性能与工程应用", 《墙材革新与建筑节能》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108558330A (en) * | 2018-05-22 | 2018-09-21 | 武汉源锦建材科技有限公司 | A kind of tunnel-liner vault band mould grouting microdilatancy grout material |
| CN108558330B (en) * | 2018-05-22 | 2021-01-08 | 武汉源锦建材科技有限公司 | Micro-expansion grouting material for grouting with mold at arch crown of tunnel lining |
| CN114524682A (en) * | 2022-03-02 | 2022-05-24 | 林志海 | Lightweight aggregate micro-expansion anti-cracking concrete with adjustable expansion performance |
| CN114524682B (en) * | 2022-03-02 | 2023-11-03 | 林志海 | Lightweight aggregate micro-expansion anti-cracking concrete with adjustable expansion performance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110776289B (en) | Light high-strength ceramsite concrete and preparation method and application thereof | |
| CN102910889B (en) | Aerated concrete wall material containing river silt and preparation method thereof | |
| CN102464463B (en) | Compound high-performance expanding agent for cement-based material | |
| CN101863072B (en) | Internal curing process for improving performance of high strength and slight expansion concrete | |
| CN107986671A (en) | A kind of low rebound, anti-corrosion type gunite concrete specific complex admixture and application | |
| CN102515826A (en) | Autoclaved fly ash aerated concrete building block and production method thereof | |
| JP2013517202A (en) | Cement-free alkali-active binder containing composite alkali activator, mortar or concrete using the same | |
| CN113213807A (en) | Composite anti-cracking agent for ultra-long large-volume concrete and preparation method thereof | |
| KR101636283B1 (en) | Pile grouting materials using ferronickel slag | |
| CN114180875B (en) | Anti-cracking and anti-permeability agent for permeable crystallization type high-performance concrete and preparation method thereof | |
| KR102310854B1 (en) | Concrete manufactured with a salt-resistance enhancing composition capable of self-repairing concrete cracks, and a method for manufacturing concrete structures with improved salt-resistance | |
| CN111116117A (en) | Chemically-excited sulfur-fixing ash-slag-based foamed light soil | |
| KR20180002288A (en) | Grout material composition and high fluidity-grout material using the same | |
| CN108546048B (en) | Foam concrete composite wallboard core material and preparation method thereof | |
| CN112851255B (en) | Self-heat-insulating building material in alpine region and preparation method thereof | |
| CN103539416B (en) | A kind of anti-shearing synchronous grouting dedicated mortar and its preparation method | |
| CN102320804A (en) | Non-bearing insulating brick | |
| KR20180052969A (en) | Expandable mortar composition for civil engineering works | |
| CN113548854A (en) | Concrete light energy-saving composite wallboard and preparation method thereof | |
| CN102432232A (en) | Light aggregate micro expansion anti-crack concrete | |
| KR101410796B1 (en) | Rapid solidified agent for deep mixing method on sea | |
| CN115304326B (en) | Shrinkage-compensating self-compacting concrete and preparation method thereof | |
| CN116693326A (en) | Light mud state solidified soil and preparation method thereof | |
| CN115385623A (en) | Carbon absorption foam concrete based on industrial waste residues and preparation method thereof | |
| EP4098639A1 (en) | Foamed mineral binder compositions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120502 |