CN108585589B - Concrete additive and application thereof - Google Patents
Concrete additive and application thereof Download PDFInfo
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- CN108585589B CN108585589B CN201810401671.7A CN201810401671A CN108585589B CN 108585589 B CN108585589 B CN 108585589B CN 201810401671 A CN201810401671 A CN 201810401671A CN 108585589 B CN108585589 B CN 108585589B
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- concrete
- water
- fluorine
- retaining agent
- admixture
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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
Abstract
The invention discloses a concrete admixture which comprises the following components: the water-retaining agent is formed by mixing amino acid methylglycine proline and a fluorine-containing linear chain block acrylic polymer. The amino acid methylglycine proline and the fluorine-containing straight chain block acrylic polymer are mixed according to a certain proportion to serve as the water retaining agent, the water retaining effect is achieved by adjusting the water on the surface and the interior of the concrete, and the problem that the water of the pervious concrete is quickly evaporated is solved.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a concrete admixture and application thereof.
Background
The construction of the sponge city with natural accumulation, natural permeation and natural purification can effectively solve the problems of waterlogging and water resource shortage of some cities, is favorable for improving the ecological environment of the city, increases the social benefit and is an urgent need of novel urbanization construction.
The pervious concrete has good water and air permeability, high-efficiency water storage capacity and good decoration, and is a novel material worthy of popularization in the construction of sponge cities. In order to optimize the performance of pervious concrete and meet the requirement of sponge city, a large number of groups have studied pervious concrete, such as:
chinese patent No. CN201610539959.1 discloses a special admixture for pervious concrete and application thereof. The special additive for the pervious concrete comprises the following components in percentage by mass: 10-20% of polycarboxylic acid water reducing agent, 5-25% of polycarboxylic acid slump retaining agent, 0.5-3% of water retaining agent, 0.5-5% of thickening agent, 1-5% of retarder and 52-75% of water; the dosage of the additive in the pervious concrete is 1-2% of the mass of the cementing material. The special admixture for the pervious concrete has good synergistic effect among the components, can better keep the workability of the pervious concrete for 2 hours or more on the basis of ensuring the water permeability of the admixture, improves the strength after time, and realizes the ready-mixed production of the pervious concrete. The water-retaining agent used in the invention has poor chemical stability and is greatly influenced by temperature, and the working performance of the water-retaining agent is influenced by the heat release of concrete in the mixing process, so that the problem of rapid water loss of concrete cannot be solved.
Chinese CN201610954303.6 discloses an admixture for cement-based pervious concrete, which comprises the following components in parts by mass: 5-6 parts of early strength high water reducing polycarboxylic acid mother liquor, 2-3 parts of super slow release polycarboxylic acid mother liquor, 0.5-1 part of early strength agent, 0.5-1.5 parts of organic retarder, 0.1-0.5 part of inorganic retarder, 3-10 parts of viscosity modifier, 0.1-0.5 part of air entraining agent, 0.1-3 parts of defoaming agent, 0.1-0.5 part of internal moisture regulator, 0.3-0.5 part of surface moisture regulator and 70-90 parts of water. The admixture can effectively improve the early strength and low slump retaining capacity of the cement-based pervious concrete, reduce the air content and the sensitivity to water of fresh slurry and increase the water retention and moisture retention of the fresh slurry. The invention uses the viscosity modifier to ensure that the slurry and the coarse aggregate have good cohesive force, but still causes the slurry to sink in the long-time transportation process, and the additive has higher cost.
One bottleneck problem in the widespread use of ready-mixed pervious concrete is how to extend the transport distance of the ready-mixed pervious concrete and expand the market radius. The prior pervious concrete has short transportation time and can only meet the construction requirement of short-distance transportation, wherein the control of the maintenance of the working performance of the pervious concrete in the transportation process of the pervious concrete is a key technology for determining the wide use of the ready-mixed pervious concrete, because the consistency control of the ready-mixed pervious concrete is much stricter than that of the common concrete, the consistency control is separated when the consistency is slightly less, the setting time is too short when the consistency is slightly more thick, and the slurry hanging performance requirement is good. Problems with pervious concrete: the pervious concrete is porous during accumulation, transportation and construction of the pervious concrete, a large amount of water is evaporated in the pervious concrete, and the water loss is fast; the loss of the working performance of the slurry during the transportation process and the slurry sinking caused by the bumping during the transportation process. The solution of the above problems requires special admixture for adjustment, and therefore, it is urgently required to design a concrete admixture to solve the above problems.
Disclosure of Invention
The invention aims to provide a concrete admixture and application thereof aiming at the problems in the prior art, the amino acid methylglycine proline and the fluorine-containing linear chain block acrylic polymer are mixed according to a certain proportion to be used as a water-retaining agent, and the water-retaining effect is achieved by adjusting the water on the surface and the interior of the concrete, so that the problem of faster water evaporation of the pervious concrete is solved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a concrete admixture which comprises the following components in percentage by weight:
the water-retaining agent is formed by mixing amino acid methylglycine proline and a fluorine-containing linear chain block acrylic polymer.
The amino acid methylglycine proline and the fluorine-containing straight chain block acrylic polymer are mixed according to a certain proportion to serve as the water retaining agent, the water retaining effect is achieved by adjusting the water on the surface and the interior of the concrete, and the problem that the water of the pervious concrete is quickly evaporated is solved. The amino acid methyl glycine proline can adjust the moisture on the surface of concrete, contains a large amount of carboxyl on the molecular structure, and the carboxyl belongs to a hydrophilic group and can form a hydrogen bond with water molecules to adsorb the moisture in the air and keep the surface of the pervious concrete moist.
The fluorine-containing linear chain block acrylic polymer can regulate the moisture in the concrete, structurally has a slightly crosslinked macromolecular space network, has a plurality of dissociative groups, and has a network structure formed by chemical crosslinking and physical crosslinking of mutual entanglement among macromolecular chains. When the polymer encounters water, positively charged low molecular ions and negatively charged high molecular ions are immediately dissociated. The low molecular ions move by contacting with water and leave the macromolecular ion chains, and the macromolecular net beams are gradually extended from a mutual winding state due to mutual repulsive force among the macromolecular ions with negative charges, so that osmotic pressure is generated inside and outside the network structure, and water molecules are diffused to the network structure in an osmotic mode to form sol, so that internal water loss is prevented, the viscosity of the colloid is enhanced, and the slurry is prevented from sinking to the bottom; in addition, the fluorine-containing linear chain block acrylic polymer is a fluorine-containing polymer, and when fluorine-containing functional groups are uniformly distributed in the slurry, the mechanical properties, the friction resistance, the heat resistance and other chemical properties of concrete can be enhanced.
The amino acid methylglycine proline and the fluorine-containing linear chain block acrylic polymer can enhance the viscosity of colloid to play a role of a thickening agent, so that the additive disclosed by the invention does not need to additionally add the thickening agent, and the cost is reduced.
Preferably, the water-retaining agent is amino acid methylglycine proline and fluorine-containing linear chain block acrylic acid polymer in a weight ratio of 1-4: 1.
The fluorine-containing straight chain block acrylic polymer is prepared by carrying out free radical initiation polymerization on acrylic acid, acrylate and fluorine-containing acrylate under the action of an emulsifier and an initiator.
Preferably, the emulsifier is sodium alkyl benzene sulfonate; the initiator is ammonium persulfate.
The slump retaining agent is formed by mixing ester polycarboxylic acid and a cross-linked acrylic polymer according to the weight ratio of 1-4: 2-5.
The retarder is one or a mixture of sodium gluconate, sucrose and citric acid.
The invention also provides an application of the concrete admixture, wherein the dosage of the admixture in the pervious concrete is 1-2% of the weight of the cementing material.
The concrete added with the admixture can achieve long-time working performance maintenance, the slurry aggregate has good bonding performance and no separation, the water evaporation loss can be controlled to be 5-10% after 3 hours, and the concrete still has good construction performance after 3 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) the mixture of the amino acid methylglycine proline and the fluorine-containing linear chain block acrylic polymer is used as the water-retaining agent, so that the water on the surface and in the concrete is regulated, and the water loss of the concrete is effectively reduced;
(2) the water-retaining agent adopted by the invention improves the cohesive force of concrete slurry, so that the slurry is tightly wrapped around aggregate, the slurry is prevented from sinking to the bottom, and the effect of a thickening agent is achieved, so that the additive does not need to be additionally added with the thickening agent, and the cost is reduced;
(3) the fluorine-containing straight chain block acrylic polymer is a fluorine-containing polymer, and can enhance the mechanical properties, the friction resistance, the heat resistance and other chemical properties of concrete.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a concrete admixture which comprises the following components in percentage by weight:
the above range is the optimal range obtained by a large number of experiments of the inventor, when the admixture prepared according to the above range is applied to concrete, the use amount of the admixture in the concrete is 1-2% of the weight of the cementing material, the long-time working performance maintenance can be achieved, the slurry aggregate bonding performance is good, no separation is caused, the water evaporation loss can be controlled within 5-10% after 3h, and the good construction performance can still be achieved after 3 h; the amounts of the external additive and the external additive described in the following examples are within the above-mentioned ranges.
The inventor of the application obtains the content of the amino acid methylglycine proline and the fluorine-containing linear chain block acrylic polymer according to the weight ratio of 1-4: 1 the water-retaining agent obtained by mixing has the best performance of preventing the water evaporation of concrete when acting on the concrete, and has excellent thickening effect.
Method for testing water evaporation loss rate
A certain amount of fresh concrete m1 is placed in a drying oven at 25 +/-2 ℃, the weight loss of the fresh concrete at 3 hours is taken as water evaporation capacity m2, the total weight of pervious concrete m3, the water consumption m4, and the water evaporation rate of 3 hours is (m2 m3)/(m1 m4) 100 percent, and the test method is applicable to all the following examples and comparative examples.
Method for testing consistency loss rate
Freshly mixed concrete was screened out of the slurry by forced vibration and tested using a mortar consistometer to test the consistency c1 and c2 for initial and 3 hours respectively with a loss of consistency (c1-c2) × 100%/c 1, which was applied to all the following examples and comparative examples.
Strength testing method
A concrete strength test is carried out according to CJJ/T135-2009 technical Specification for pervious cement concrete pavements, and the concrete mixing ratio is as follows: water: stone: the mineral powder is 360:110:1600:20 (weight ratio), the admixture dosage is 1-2% of the cementing material, the dosage is the flexural and solid dosage, and the cement is Huaxin PO42.5 based on the weight of the cement and the mineral powder.
Example 1
The invention provides a concrete admixture which comprises the following components in percentage by weight:
the water-retaining agent is formed by mixing amino acid methylglycine proline and a fluorine-containing linear chain block acrylic polymer according to the weight ratio of 3: 1.
The dosage of the admixture in the concrete is 1.5 percent of the weight of the cementing material; according to the cement: water: stone: and (3) mixing the mineral powder in a weight ratio of 360:110:1600:20 to obtain the concrete.
The fluorine-containing straight chain block acrylic polymer is prepared by carrying out free radical initiation polymerization on acrylic acid, acrylate and fluorine-containing acrylate under the action of sodium alkyl benzene sulfonate and ammonium persulfate; the slump retaining agent is formed by mixing ester polycarboxylic acid and a cross-linked acrylic polymer according to the weight ratio of 1: 2; the retarder is sodium gluconate.
Example 2
The invention provides a concrete admixture which is different from the concrete admixture in example 1 in that the water-retaining agent is prepared by mixing amino acid methylglycine proline and a fluorine-containing linear chain block acrylic acid polymer according to the weight ratio of 1:5, and the concrete is prepared according to the method in example 1.
Example 3
The invention provides a concrete admixture which is different from the concrete admixture in example 1 in that the water-retaining agent is prepared by mixing amino acid methylglycine proline and a fluorine-containing linear chain block acrylic acid polymer according to the weight ratio of 10:1, and the concrete is prepared according to the method in example 1.
Example 4
The invention provides a concrete admixture which is different from that in example 1 in that the slump retaining agent is ester polycarboxylic acid and a cross-linked acrylic polymer in a weight ratio of 2:5, and the concrete is prepared according to the method in example 1.
Example 5
The invention provides a concrete admixture, which is different from the concrete admixture in example 1 in that the dosage of the admixture in pervious concrete is 1 percent of the weight of a cementing material, and the concrete is prepared according to the method in example 1.
Example 6
The invention provides a concrete admixture, which is different from the concrete admixture in example 1 in that the dosage of the admixture in pervious concrete is 2% of the weight of a cementing material, and the concrete is prepared according to the method in example 1.
Comparative example 1
The comparative example provides a concrete admixture, compared with example 1, the difference is that the water retaining agent is prepared by mixing amino acid methylglycine proline and sodium polyacrylate according to the weight ratio of 3:1, and the concrete is prepared according to the method in example 1.
Comparative example 2
This comparative example provides a concrete admixture, which is different from example 1 in that the water-retaining agent is formed by mixing sorbitol and a fluorine-containing linear block acrylic polymer in a weight ratio of 3:1, and concrete is prepared by the method described in example 1.
Comparative example 3
Compared with the comparative example 1, the concrete admixture is characterized in that the water-retaining agent is prepared by mixing sorbitol and sodium polyacrylate according to the weight ratio of 3:1, and the concrete is prepared according to the method in the example 1.
Test results
The concrete prepared under the conditions described in the above examples and comparative examples was tested according to the test method for water evaporation loss rate, the test method for consistency loss rate, and the strength test method, and the results are shown in table 1.
TABLE 1 test results of various properties of pervious concrete
By comparing the test results of the above examples and comparative examples, it can be seen that the long-term working performance retention can be achieved by changing the ratio of the amino acid methylglycine proline to the fluorine-containing linear chain block acrylic polymer to act on the concrete within the scope of the invention, the slurry aggregate has good binding property and no separation, the water evaporation loss can be controlled within 5-10% within 3h, the consistency loss can be controlled within 6-12% within 3h, and all the properties meet the construction requirements of the concrete; the composition of the slump retaining agent is changed within the range, the slump retaining agent has promotion effects on the water retention, consistency, strength and other performances of concrete, and the slump retaining agent has better performances compared with 2:5 when the weight ratio of the ester polycarboxylic acid to the cross-linked acrylic polymer in the slump retaining agent is 1: 2; when the water-retaining agent is amino acid methylglycine proline and the fluorine-containing linear chain block acrylic polymer, the weight ratio of the water-retaining agent to the fluorine-containing linear chain block acrylic polymer is 1-4: 1, the water content on the surface of the concrete and the water content in the concrete can be uniformly adjusted by mutually matching the two substances, so that the water retention agent can ensure that the water evaporation loss is controlled to be about 5% after 3 hours of action on the concrete, the consistency loss is controlled to be about 6% after 3 hours of action, and the water retention agent is almost the same as the performance of the newly mixed concrete, therefore, when the weight ratio of the amino acid methylglycine proline to the fluorine-containing linear chain block acrylic acid polymer is 1-4: 1, when the weight ratio of the amino acid methylglycine proline to the fluorine-containing linear chain block acrylic polymer is not between 1 and 4: 1 range, the water-retaining agent has deviation of more excellent performance of keeping the surface moisture of concrete or more excellent performance of keeping the internal moisture of concrete, so that the comprehensive water-retaining property is slightly reduced, but the water-retaining agent still has excellent water-retaining property compared with the traditional water-retaining agent.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The concrete admixture is characterized by comprising the following components in percentage by weight:
wherein the water-retaining agent is prepared from amino acid methylglycine proline and a fluorine-containing linear chain block acrylic polymer according to the weight ratio of 1-4: 1 are mixed.
2. The concrete admixture according to claim 1, wherein the fluorine-containing linear block acrylic polymer is obtained by radical-initiated polymerization of acrylic acid, acrylate and fluorine-containing acrylate under the action of an emulsifier and an initiator.
3. The concrete admixture according to claim 2, wherein the emulsifier is sodium alkyl benzene sulfonate; the initiator is ammonium persulfate.
4. The concrete admixture according to claim 1, wherein the slump retaining agent is formed by mixing ester polycarboxylic acid and cross-linked acrylic acid polymer according to a weight ratio of 1-4: 2-5.
5. The concrete admixture according to claim 1, wherein the retarder is one or a mixture of sodium gluconate, sucrose and citric acid.
6. The method for using the concrete admixture according to any one of claims 1 to 5, wherein the admixture is used in the pervious concrete in an amount of 1 to 2% by weight based on the weight of the cementitious material.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3346519B2 (en) * | 1995-05-26 | 2002-11-18 | キッコーマン株式会社 | Water-soluble separation reducing agent for hydraulic substance, hydraulic composition and molded hydraulic substance using the same |
| CN102504084A (en) * | 2011-09-29 | 2012-06-20 | 江苏博特新材料有限公司 | Preparation method of high-performance concrete curing agent with hydrophobic property |
| CN103923275A (en) * | 2014-03-18 | 2014-07-16 | 深圳大学 | Amphoteric betaine polycarboxylic acid water reducing agent and preparation method thereof |
| CN106186795A (en) * | 2016-07-08 | 2016-12-07 | 江苏苏博特新材料股份有限公司 | A kind of pervious concrete special additive and application thereof |
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- 2018-04-28 CN CN201810401671.7A patent/CN108585589B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3346519B2 (en) * | 1995-05-26 | 2002-11-18 | キッコーマン株式会社 | Water-soluble separation reducing agent for hydraulic substance, hydraulic composition and molded hydraulic substance using the same |
| CN102504084A (en) * | 2011-09-29 | 2012-06-20 | 江苏博特新材料有限公司 | Preparation method of high-performance concrete curing agent with hydrophobic property |
| CN103923275A (en) * | 2014-03-18 | 2014-07-16 | 深圳大学 | Amphoteric betaine polycarboxylic acid water reducing agent and preparation method thereof |
| CN106186795A (en) * | 2016-07-08 | 2016-12-07 | 江苏苏博特新材料股份有限公司 | A kind of pervious concrete special additive and application thereof |
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Effective date of registration: 20221031 Address after: 713800 Cai Jia Cun, Anle Town, Sanyuan County, Xianyang City, Shaanxi Province Patentee after: SHAANXI CHANGLONG TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: 1701, building 4, contemporary dream workshop, guannanyuan 1st Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee before: ZHENSHUO (WUHAN) INTELLIGENT TECHNOLOGY Co.,Ltd. |
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