CN102372467B - Method for preparing low-strength concrete by using polycarboxylate superplasticizer - Google Patents
Method for preparing low-strength concrete by using polycarboxylate superplasticizer Download PDFInfo
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- CN102372467B CN102372467B CN 201010262742 CN201010262742A CN102372467B CN 102372467 B CN102372467 B CN 102372467B CN 201010262742 CN201010262742 CN 201010262742 CN 201010262742 A CN201010262742 A CN 201010262742A CN 102372467 B CN102372467 B CN 102372467B
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Abstract
The invention relates to a method for preparing low-strength concrete by using a polycarboxylate superplasticizer, which is characterized in that hydrophillic colloid extracted from plants, the polycarboxylate superplasticizer and an air-entraining agent are added in the concrete, wherein, the hydrophillic colloid is capable of reducing the sensitivity of the polycarboxylate superplasticizer, enhancing the water retaining capacity of the concrete and increasing the slump-blocking performance; the introduced air-entraining agent is capable of increasing the slump-blocking performance of the concrete for further, increasing the fluidity of the concrete and reducing the usage amount of the polycarboxylate superplasticizer, so that the low-strength concrete can be prepared by cooperatively using the polycarboxylate superplasticizer.
Description
Technical field
The present invention relates to a kind of method for preparing lower intensity level concrete, relate in particular to a kind of method of using polycarboxylate water-reducer preparation lower intensity level concrete.
Background technology
Polycarboxylate high performance water-reducing agent is that present scientific and technological content in the world is higher, a kind of cement water reducing agent (claiming superplasticizer again) of high comprehensive performance, because poly carboxylic acid series water reducer has the water-reducing rate height, remarkable, the concrete workability of reinforced effects better, does not influence concrete Young's modulus, loses advantages such as less when slightly caving in, in recent years in various engineerings, especially prepare in the concrete of high-grade intensity and be widely used.Development from external poly carboxylic acid series water reducer, high performance water reducing agent of polyocarboxy acid has been the principal item of external high efficiency water reducing agent, in Japan and Korea S, the rate of utilization of poly carboxylic acid series water reducer is up to about 90%, also reach 60%～70% in the U.S., at home, high performance water reducing agent of polyocarboxy acid is mainly used in as in the priority projects such as high ferro, bridge.
Though during with polycarboxylate water-reducer preparation higher-strength grade concrete, good cost performance, and obtained the approval in market.But be to use polycarboxylate water-reducer in, bad adaptability in the lower intensity level concrete, in, when directly using in the ready mixed concrete of low strength grade, because the characteristics of polycarboxylate high performance water-reducing agent high water reducing rate, even in application, reduce the poly carboxylic acid series water reducer volume, also can obtain the higher water-reducing rate than naphthalene system, and the increase of water-reducing rate, the concrete water amount is reduced, but always the slurry amount is very little for concrete, to have a strong impact on concrete serviceability, when therefore directly using polycarboxylate water-reducer, must strictly control the concrete mix example; But, for some cement, in, when directly using poly carboxylic acid series water reducer in the inferior grade intensity concrete, if volume is turned down to satisfy the requirement of low water-reducing rate, the situation that concrete slump retaining can not meet the demands can appear; Simultaneously, when preparation inferior grade intensity concrete, because the sandstone material inferior quality during preparation inferior grade intensity concrete, more high as the sandstone silt content, make the volume of polycarboxylate water-reducer just increase, every cube of concrete cost will be than using the high of water reducers such as naphthalene system, aliphatics, and cost performance is improper.
What Chinese commodity concrete mixing plant major part was sold at present is that strength grade is the concrete of C20～C35, main sodium lignosulfonate or the naphthalene water reducer of using, and use polycarboxylate water-reducer beyond affordability prepares concrete, reason have following some: the one, the sandstone material quality that stirring station uses is poor slightly, it can not be accomplished as key state project (as high-speed railway), and sandstone material supplier is carried out strict selecting; And the polycarboxylate water-reducer adsorption activity is strong, runs into the silt content height, when containing the high sandstone material of stone flour amount, and volume need increase a lot, and every cube of concrete cost will increase; The 2nd, polycarboxylate water-reducer water-reducing rate height, metering has deviation slightly, will cause disadvantages such as concrete generation bleeding or dew stone; The 3rd, during preparation inferior grade intensity concrete, the polycarboxylate water-reducer consumption that mixes, still similar with the high-grade intensity concrete of preparation, so just be not so good as to use water reducer economy such as naphthalene system.Therefore, though the concrete that uses polycarboxylate water-reducer to beat, concrete density is good, shrinkage crack is few and short, concrete normal temperature maintenance intensity rises fast, advantages such as engineering long service life, but stirring station refusal uses the problem of polycarboxylate water-reducer, principal focal point are on the cost performance with polycarboxylate water-reducer preparation inferior grade intensity concrete the time.
In inferior grade intensity concrete formulation, the addition content of water is very big to concrete slump retaining influence, when using polycarboxylate water-reducer to break inferior grade intensity concrete, often exist because the polycarboxylate water-reducer water-reducing rate is too high, the add-on of water descends, and adds and does not intake, and slump retaining is just poor like this; If water is added according to former certainty ratio, will cause concrete bleeding to occur.Therefore, reduce the volume of polycarboxylate water-reducer, reduce the susceptibility to the sandstone material, polycarboxylate water-reducer is accepted by the commerical ready-mixed concrete stirring station.
Poly carboxylic acid series water reducer has the advantage of " environmental protection, energy-conservation, consumption reduction ", it is the first-selected admixture of green concrete, from the distribution situation of Shanghai City concrete class intensity in recent years, the above concrete of C35 only accounts for more than 30%, C30 and C30 following in, inferior grade intensity concrete, account for 65% and also want many, therefore, how making the polycarboxylate water-reducer broader applications in the ready mixed concrete of various grade strengths, is the problem that the concrete admixture industry is worth research.
Summary of the invention
The invention provides a kind of method of using polycarboxylate water-reducer preparation lower intensity level concrete, plant lyophilic colloid and air entrapment agent are joined in the concrete with polycarboxylate water-reducer.Can reduce the susceptibility of polycarboxylate water-reducer behind the adding plant lyophilic colloid, strengthen the concrete water retention capacity, improve slump retaining; Can further increase concrete slump retaining after adding air entrapment agent, increase the mobile degree of concrete, thereby can reduce the polycarboxylate water-reducer consumption, reach the purpose for preparing the rational lower intensity level concrete of cost performance with polycarboxylate water-reducer.
The present invention uses the method for polycarboxylate water-reducer preparation lower intensity level concrete to be: in mixing the concrete of polycarboxylate water-reducer, add lyophilic colloid and air entrapment agent simultaneously.Add lyophilic colloid, can strengthen the concrete water retention capacity, the polysaccharide of wherein said lyophilic colloid for from plant, extracting; Add air entrapment agent, can further increase concrete slump retaining, increase the mobile degree of concrete, thereby can reduce the polycarboxylate water-reducer consumption.Wherein, described lyophilic colloid and air entrapment agent can join earlier in the water reducer, mix, and join together then in the concrete, and perhaps the two adds in the concrete mixing process.Described lyophilic colloid is preferably the lyophilic colloid that extracts from seaweed plants or taro platymiscium, as sodium alginate, carrageenin, agar, konjak gum etc., the aqueous solution that can be made into 0.05～1.5% concentration earlier uses (and being preferably with 30～100 ℃ of warm water preparations), and the lyophilic colloid consumption accounts for 0.00001～0.001% of cement amount and gets final product; Described air entrapment agent is preferably one or more in rosin derivative, sulfonate, soap class, phenolic ether or the alcohol ether, as colophonium pyrolytic polymer, rosined soap, alkyl sodium sulfonate, sodium alkyl benzene sulfonate, sulfonated lignin, triterpenoid saponin, lauryl alcohol polyoxyethylene (9) ether, Nonyl pheno (10) ether etc., its consumption can account for 0.005～0.05% of cement amount.
According to a kind of preferred implementation of described preparation method, wherein, add in the process of air entrapment agent, detect concrete 's air-containing, in the time of in concrete 's air-containing reaches 4～11% scopes, stop to add air entrapment agent.
According to described preparation method's further preferred implementation, wherein, in the time of in concrete 's air-containing reaches 6～9% scopes, stop to add air entrapment agent.
According to above-mentioned preparation method's preferred implementation, wherein, earlier lyophilic colloid is joined in the described water reducer, mix, join in the concrete together then.
With polycarboxylate water-reducer preparation inferior grade intensity concrete the time, in order to reduce the incorporation of polycarboxylate water-reducer, except normal cement, flyash, sand, stone, the water etc. of using, also need in the water reducer that adds, mix a small amount of plant lyophilic colloid and air entrapment agent.Behind minimizing polycarboxylate water-reducer incorporation, concrete slump retaining can obviously descend, and in order to improve concrete slump retaining, needs adding plant lyophilic colloid and air entrapment agent to be improved.Can reduce the susceptibility of polycarboxylate water-reducer behind the adding plant lyophilic colloid, strengthen the concrete water retention capacity, improve slump retaining.Can increase concrete slump retaining after adding air entrapment agent, increase the mobile degree of concrete, reduce the polycarboxylate water-reducer consumption, and the concrete that the add-on of air entrapment agent is prepared than usual wants many.
The present invention uses the method for polycarboxylate water-reducer preparation lower intensity level concrete, can make that cost performance is suitable, strength grade is at C35 or the concrete below the C35.
Embodiment
The concrete bad adaptability of polycarboxylate water-reducer centering inferior grade intensity generally for the preparation of the concrete of high-grade intensity, and adopts the present invention to prepare the method for lower intensity level concrete, can prepare inferior grade intensity (as≤C35) concrete.
With polycarboxylate water-reducer preparation inferior grade intensity concrete the time, in order to reduce the incorporation of polycarboxylate water-reducer, except normal cement, flyash, sand, stone, the water etc. of using, also need in the water reducer that adds, mix a small amount of plant lyophilic colloid and air entrapment agent.
Described plant lyophilic colloid is to belong to the natural polysaccharide carbohydrate.Mainly be the lyophilic colloid that from seaweed plants such as sea-tangle, marine alga, sea grass, gelidium, fragrant plant mentioned in ancient texts, laver, extract, as sodium alginate, carrageenin, agar etc.; Also have the lyophilic colloid that extract in other some plants, as the lyophilic colloid that extract in taro, the konjaku, as konjak gum etc., the commercially available pulvis that is generally.The pulvis consumption of general these plant lyophilic colloids accounts for 0.00001～0.001% of cement amount.Can be earlier during use the pulvis of these plant lyophilic colloids be diluted to the certain density aqueous solution in warm water, be generally 0.05～1.5% concentration, in the concrete mixing process, join in the concrete then, also it can be joined in the polycarboxylate water-reducer in advance according to a certain percentage.
It is surfactant-based preferably that above-mentioned air entrapment agent is generally foam stability, be preferably rosin derivative, sulfonate, soap class, aliphatic alcohol polyether, alkyl phenol polyether, as colophonium pyrolytic polymer, rosined soap, alkyl sodium sulfonate, sodium alkyl benzene sulfonate, sulfonated lignin, triterpenoid saponin, lauryl alcohol polyoxyethylene (9) ether, Nonyl pheno (10) ether etc.The add-on of air entrapment agent can account for 0.005～0.05% of cement amount, can use one or more mixing wherein to use.
We by the add-on of air entrapment agent what, adjust concrete air content, generally with air content control 4～11%, preferably control 6～9%.The quality of selected air entrapment agent foam stability energy is bigger to concrete slump retaining influence.For the strength degradation that causes after the concrete 's air-containing rising, can take suitably to reduce water cement ratio increases concrete strength.
Be example with carrageenin and triterpenoid saponin, preparation inferior grade intensity concrete.
Embodiment 1:
PO42.5 cement 2.5Kg, flyash 1Kg, middle husky 8Kg, stone 11Kg, water 1.7Kg, 10% polycarboxylate water-reducer PC gets 45g, carrageenin 5mg, triterpenoid saponin 250mg.
Described material with single horizontal axis forced concrete mixer mix, is mixed with concrete.
Embodiment 2:
Step 1, preparation carrageenin and the triterpenoid saponin aqueous solution
The carrageenin solid is made into the aqueous solution of 0.1% concentration.
With the triterpenoid saponin aqueous solution that is mixed with 1% concentration soluble in water.
Wherein, the above-mentioned aqueous solution is preferably with 30～100 ℃ warm water and prepares.
Step 2, concrete batching
PO42.5 cement is got 2.5Kg, flyash 1Kg, and middle sand is got 8Kg, and stone is got 11Kg, water 1.7Kg, 10% polycarboxylate water-reducer PC gets 45g, the carrageenin aqueous solution 5g of described 0.1% concentration, the triterpenoid saponin aqueous solution 25g of 1% concentration.
Described material with single horizontal axis forced concrete mixer mix, is mixed with concrete.
Carrageenin and triterpenoid saponin are made into the aqueous solution use, can make that carrageenin and triterpenoid saponin are easier to be distributed in the concrete, and disperse more even.The carrageenin isocolloid much is epoxy resin, uses warm water can make its easier dissolving and dispersion.
Embodiment 3:
On the basis of embodiment 1 or 2, increase the consumption of adulterant (as slag, flyash), suitably reduce cement consumption, reach the purpose that reduces the concrete cost.
According to the GB8076-2008 standard detection, the strength grade of concrete that above-mentioned embodiment obtains is all below C35.
More than specific embodiments of the invention are described in detail, but it is just as example, the present invention is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that the present invention is carried out and substituting also all among category of the present invention.Therefore, not breaking away from impartial conversion and the modification of doing under the spirit and scope of the present invention, all should contain within the scope of the invention.
Claims (9)
1. one kind prepares the method for lower intensity level concrete with polycarboxylate water-reducer, adds polycarboxylate water-reducer in the concrete that will prepare, it is characterized in that, also adds lyophilic colloid and air entrapment agent, and above-mentioned mixing of materials is stirred; Wherein, the lyophilic colloid of described lyophilic colloid for from plant, extracting, its consumption is 0.00001～0.001% of cement amount, described air entrapment agent consumption is 0.005～0.05% of cement amount.
2. method according to claim 1 is characterized in that, described lyophilic colloid and air entrapment agent join earlier in the water reducer, mix, and join in the concrete together then.
3. method according to claim 1 is characterized in that, described lyophilic colloid and air entrapment agent add in concrete mixing concrete process.
4. method according to claim 1 is characterized in that, detects concrete 's air-containing, in the time of in concrete 's air-containing reaches 4～11% scopes, stops to add air entrapment agent.
5. method according to claim 3 is characterized in that, in the time of in concrete 's air-containing reaches 6～9% scopes, stops to add air entrapment agent.
6. method according to claim 1 is characterized in that, described air entrapment agent is one or more in rosin derivative, sulfonate, soap class, phenolic ether or the alcohol ether.
7. method according to claim 1 is characterized in that, the polysaccharide of described lyophilic colloid for extracting from seaweed plants or taro platymiscium.
8. method according to claim 7 is characterized in that, lyophilic colloid is made into the aqueous solution uses.
9. method according to claim 8 is characterized in that, 30～100 ℃ of warm water wiring solution-formings of hydrophilic gel body and function are used.
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| CN 201010262742 CN102372467B (en) | 2010-08-24 | 2010-08-24 | Method for preparing low-strength concrete by using polycarboxylate superplasticizer |
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| CN 201010262742 CN102372467B (en) | 2010-08-24 | 2010-08-24 | Method for preparing low-strength concrete by using polycarboxylate superplasticizer |
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| CN102372467B true CN102372467B (en) | 2013-09-11 |
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| CN104446226A (en) * | 2014-12-23 | 2015-03-25 | 苏州万盛混凝土有限公司 | High-anti-permeability concrete |
| CN114315203B (en) * | 2021-12-31 | 2022-09-09 | 吉安民辉新型材料有限公司 | High-performance water reducing agent and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1209812A (en) * | 1996-11-27 | 1999-03-03 | 花王株式会社 | Polysaccharide derivatives and hydraulic compositions |
| CN1704373A (en) * | 2004-06-02 | 2005-12-07 | 罗盖特公司 | Use of polysaccharides for addition in mineral materials |
| CN101287782A (en) * | 2005-10-14 | 2008-10-15 | 格雷斯公司 | Slump retention in cementitious compositions |
| CN101549973A (en) * | 2009-05-11 | 2009-10-07 | 江苏鼎达建材有限公司 | Compound concrete high efficiency water reducing agent |
| CN101580354A (en) * | 2009-06-12 | 2009-11-18 | 福建科之杰新材料有限公司 | Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade |
| CN101798199A (en) * | 2010-02-05 | 2010-08-11 | 中建商品混凝土有限公司 | Polycarboxylate composite water reducing agent suitable for low-cementitious material concrete and preparation method thereof |
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- 2010-08-24 CN CN 201010262742 patent/CN102372467B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1209812A (en) * | 1996-11-27 | 1999-03-03 | 花王株式会社 | Polysaccharide derivatives and hydraulic compositions |
| CN1704373A (en) * | 2004-06-02 | 2005-12-07 | 罗盖特公司 | Use of polysaccharides for addition in mineral materials |
| CN101287782A (en) * | 2005-10-14 | 2008-10-15 | 格雷斯公司 | Slump retention in cementitious compositions |
| CN101549973A (en) * | 2009-05-11 | 2009-10-07 | 江苏鼎达建材有限公司 | Compound concrete high efficiency water reducing agent |
| CN101580354A (en) * | 2009-06-12 | 2009-11-18 | 福建科之杰新材料有限公司 | Polycarboxylic retarding high-performance water reducing agent for preparing concrete of middle and low strength grade |
| CN101798199A (en) * | 2010-02-05 | 2010-08-11 | 中建商品混凝土有限公司 | Polycarboxylate composite water reducing agent suitable for low-cementitious material concrete and preparation method thereof |
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