CN112239333A - Additive composition for reducing air bubbles on surface of hardened high-strength concrete and preparation method thereof - Google Patents
Additive composition for reducing air bubbles on surface of hardened high-strength concrete and preparation method thereof Download PDFInfo
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- CN112239333A CN112239333A CN202011132975.1A CN202011132975A CN112239333A CN 112239333 A CN112239333 A CN 112239333A CN 202011132975 A CN202011132975 A CN 202011132975A CN 112239333 A CN112239333 A CN 112239333A
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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
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- C04B40/0039—Premixtures of ingredients
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Abstract
The invention provides an admixture composition for reducing air bubbles on the surface of hardened high-strength concrete, which comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10-30: 1; the component A consists of the following raw materials in percentage by weight: 1.5-3.0% of inorganic nano mineral material, 15-30% of micro silicon powder, 20-40% of fly ash micro bead, 20-40% of mineral powder, 15-30% of expanding agent, 0.015-0.045% of hyperdispersant, 3-6% of neopentyl glycol and 0.002-0.004% of tributyl phosphate; the component B consists of the following raw materials in percentage by weight: 20-40% of a low molecular weight polycarboxylic acid water reducing agent, 10-30% of a slow release polycarboxylic acid water reducing agent, 2-4% of a retarder, 0.03-0.2% of a micro-foaming agent, 0.05-0.4% of a polyether modified organic silicon defoaming agent, 0.02-0.1% of an organic lubricant and 40-60% of water.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to an additive composition for reducing air bubbles on the surface of hardened high-strength concrete, and a preparation method and an application method thereof.
Background
Along with the improvement of human environmental awareness and the transformation of aesthetic concept, the requirements of beauty and environmental coordination are met, and the application and popularization of the high-performance fair-faced concrete become one of the inevitable trends of modern concrete engineering construction development. The quality of the air bubbles on the surface of the hardened concrete is one of the key indexes for controlling the fair-faced concrete, and because a large amount of air bubbles on the surface of the concrete influence the concrete quantity, the quality is mainly reflected in the following aspects: firstly, the existence of a large amount of air bubbles on the surface of hardened concrete reduces the compactness of the concrete and also reduces the effective section size of the concrete, thereby influencing the strength of the concrete structure; secondly, the existence of a large number of bubbles provides channels for various erosion, the carbonization speed of the surface of the concrete is accelerated, the thickness of the reinforced concrete protective layer is reduced, the corrosion resistance and the frost resistance of the concrete are reduced, and the durability of the concrete structure is influenced; finally, the presence of large numbers of bubbles, especially large bubble structures, severely affects the apparent quality of the concrete.
At present, the appearance and application of high and ultra-high strength concrete meet the requirements of high-rise structures, large span systems, corrosive environments and other occasions. However, in the high-strength concrete, due to the characteristics of high consumption of the cementing material, low water consumption of single-side concrete, low water-cement ratio and the like, the concrete has overlarge viscosity, bubbles are not easy to discharge, large bubbles and air hole structures are easy to appear on the surface of hardened concrete, the appearance quality of the concrete is seriously influenced, and the mechanical property of the concrete is also influenced.
The prior art mainly depends on the selection of construction process, template and release agent, and there is a related research for reducing the area of air bubbles on the surface of hardened high-strength concrete by modifying concrete materials so as to improve the appearance quality of the hardened concrete. It is known that factors affecting the number and the pore diameter of air bubbles on the surface of concrete are relatively complex, and for high-strength concrete materials, the factors include freshly mixed viscosity, the foam inhibition and defoaming capability of an additive in the concrete, the quality of air bubbles introduced by the additive and the like.
Disclosure of Invention
The invention aims to solve the problems and the defects of the prior art and provides an admixture composition for reducing air bubbles on the surface of hardened high-strength concrete, and a preparation and application method thereof, so as to solve the technical problems of more air bubbles, large pore diameter and the like on the surface of the hardened high-strength concrete. The invention aims to reduce the plastic viscosity of concrete, reduce the surface viscosity of a liquid film, inhibit and eliminate bad bubbles introduced by the polycarboxylate water reducer mother liquor and introduce a small amount of uniformly distributed tiny bubbles by reasonably matching different functional components and integrating the functions of viscosity reduction, bubble inhibition, defoaming, air entraining and the like, thereby reducing the bubble area on the surface of hardened concrete and improving the apparent quality of the concrete. The surface defects of the hardened high-strength concrete are effectively overcome based on the synergistic effect of the functions.
The invention is realized by adopting the following technical scheme, and the additive composition for reducing the bubbles on the surface of the hardened high-strength concrete is characterized in that: the adhesive comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 15-30: 1;
the component A comprises the following raw materials in percentage by mass:
the component B comprises the following raw materials in percentage by mass:
the additive composition for reducing the bubbles on the surface of the hardened high-strength concrete is characterized in that:
the inorganic nano mineral material is a compound of nano calcium carbonate and nano calcium silicate hydrate, and the compound weight percentage is 1: 0.6-1.5;
the average particle size of the micro silicon powder is 0.5-1.0 mu m, and the content of silicon dioxide is not lower than 92%;
the average particle size of the fly ash microbeads is 2-5 microns;
the 28d activity index of the mineral powder is not lower than 100%, and the average particle size is 10-15 mu m;
the expanding agent is a mixture of a calcium oxide expanding agent and a magnesium oxide expanding agent, and the calcium oxide expanding agent and the magnesium oxide expanding agent are mixed according to the mass ratio of 1: 1;
the hyperdispersant is one or a mixture of more than one of maleic anhydride esterified substance and polyacrylic ester substance in any proportion.
The small-molecular-weight polycarboxylic acid water reducing agent is polycarboxylic acid water reducing agent mother liquor with the concentration of 40%, the weight average molecular weight is 25000-30000 g/mol, and the molecular weight distribution PDI is 1.15-1.25;
the slow-release polycarboxylate water reducer is a polycarboxylate water reducer mother liquor with a concentration of 40% and an enhanced chemical slow-release function;
the retarder is any one or a mixture of two or more of sodium gluconate, sucrose and citric acid in any proportion;
the micro-foaming agent is fatty alcohol polyoxyethylene ether sulfonate;
the organic lubricant is a water-soluble high molecular polymer, has bridging and recombination functions, and is uniformly isolated and distributed in the cement paste in a manner similar to a space matrix to form a three-dimensional network structure so as to improve the fluidity and stability of the concrete.
The invention also discloses a preparation method of the admixture composition for reducing the air bubbles on the surface of the hardened high-strength concrete, which is characterized by comprising the following steps of:
(1) preparation of component A
(a) Firstly, weighing the inorganic nano mineral material and the hyperdispersant according to the weight ratio, placing the inorganic nano mineral material and the hyperdispersant into a dry powder stirrer, adjusting the speed of the stirrer to be 100-200 revolutions per minute, and stirring for 10-20 minutes;
(b) then weighing the rest raw materials according to the weight ratio, placing the rest raw materials into the dry powder stirrer in the step (a), adjusting the speed of the stirrer to 50-100 revolutions, and stirring for 10-30 minutes to obtain a component A;
(2) preparation of component B
(c) Firstly, weighing a small-molecular-weight polycarboxylic acid water reducer, a slow-release polycarboxylic acid water reducer, a polyether modified organic silicon defoaming agent and water according to a weight ratio, and stirring in a reaction kettle for 10-20 minutes;
(d) and (c) weighing the rest raw materials such as the micro-foaming agent, the organic lubricant and the like according to the weight ratio, placing the raw materials into the reaction kettle in the step (c), and stirring for 5-10 minutes to obtain a component B.
The above preparation method is further characterized by comprising the following steps:
(1) the component A can replace the cement dosage in the concrete mixing proportion in equal quantity and is used as a part of the cementing material;
(2) the using and mixing amount of the component B is 1.0-2.5 percent of the total mass of the concrete cementing material;
(3) the mixing water dosage in the concrete mixing proportion design comprises the corresponding water content of the component B, so the corresponding water content of the component B must be deducted when the mixing water is weighed;
(4) firstly, pre-mixing the component A and a concrete solid raw material for 20-30 seconds;
(5) and (4) simultaneously adding the component B and the mixing water obtained by calculation according to the step (3) into the mixture obtained in the step (4) and mixing for 120-180 seconds.
Has the advantages that: compared with the prior art, the invention has the following advantages:
according to the invention, through reasonable compatibility of different functional components, the viscosity reduction, foam inhibition, defoaming, air entraining and other functions are integrated, the plastic viscosity of a concrete system is reduced by compounding multiple viscosity reduction elements, the surface viscosity of a liquid film is reduced, bad bubbles introduced by a polycarboxylic acid water reducing agent mother solution are inhibited and eliminated, and a small amount of uniformly distributed tiny bubbles are introduced, so that the bubble area on the surface of hardened concrete is reduced, and the apparent quality of the concrete is improved. The surface quality defect of the hardened high-strength concrete is effectively overcome based on the synergistic effect of the functions.
The invention utilizes the grading effect among the superfine powder to replace more free water to improve the thickness of the water film layer on the surface of the cement particles, and simultaneously is assisted with the synergistic effect of the ball bearing effect, thereby obviously reducing the viscosity of the high-strength concrete and being beneficial to discharging air bubbles on the surface of the concrete.
According to the invention, the low-molecular-weight narrow-distribution type polycarboxylate water reducing agent is introduced to replace a common polycarboxylate water reducing agent, so that the liquid phase viscosity can be effectively reduced, the water film layer thickness and the water film layer lubricity are improved through the bridging and recombination effects of the organic lubricant to obviously reduce the concrete viscosity, and finally, the concrete workability is maintained to be stable through the slow release of the slow release type polycarboxylate water reducing agent.
The invention effectively reduces the area and the pore diameter of the bubbles on the surface of the hardened high-strength concrete by utilizing the synergistic effect of the technologies of viscosity reduction, bubble inhibition, defoaming, micro-fine bubble introduction and the like.
Detailed Description
In order to further illustrate the content of the present invention, the technical solution of the present invention is further illustrated by the following specific examples. The prepared product is evaluated by the area percentage of the surface bubbles of the hardened high-strength concrete (the ratio of the total area of the surface bubbles of the concrete to the surface area of the concrete) and the maximum pore diameter of the surface bubbles.
Example 1
An additive composition for reducing air bubbles on the surface of hardened high-strength concrete and a preparation and application method thereof,
the component A comprises the following components in percentage by mass: 1.5% of nano calcium carbonate, 1.5% of nano calcium silicate hydrate, 15% of micro silicon powder, 30% of fly ash micro-beads, 33.953% of mineral powder, 7.5% of calcium oxide expanding agent, 7.5% of magnesium oxide expanding agent, 0.045% of maleic anhydride ester, 3% of neopentyl glycol and 0.002% of tributyl phosphate.
The component B comprises the following components in percentage by mass: 30% of a low-molecular-weight polycarboxylic water reducer, 15% of a slow-release polycarboxylic water reducer, 3% of sodium gluconate, 0.05% of a micro-foaming agent, 0.1% of a polyether modified organic silicon defoaming agent, 0.05% of an organic lubricant and 51.8% of water.
The mixing amount of the component A is 30 percent of the total amount of the cementing material, and the mixing amount of the component B is 2.0 percent of the total amount of the cementing material.
Example 2
An additive composition for reducing air bubbles on the surface of hardened high-strength concrete and a preparation and application method thereof,
the component A comprises the following components in percentage by mass: 0.75% of nano calcium carbonate, 0.75% of nano calcium silicate hydrate, 30% of micro silicon powder, 20% of fly ash microbeads, 22.481% of mineral powder, 10% of calcium oxide expanding agent, 10% of magnesium oxide expanding agent, 0.015% of maleic anhydride esterified substance, 6% of neopentyl glycol and 0.004% of tributyl phosphate.
The component B comprises the following components in percentage by mass: 40% of small-molecular-weight polycarboxylic acid water reducing agent, 10% of slow-release polycarboxylic acid water reducing agent, 2.5% of sodium gluconate, 0.1% of micro-foaming agent, 0.15% of polyether modified organic silicon defoaming agent, 0.02% of organic lubricant and 47.23% of water.
The mixing amount of the component A is 30 percent of the total amount of the cementing material, and the mixing amount of the component B is 1.6 percent of the total amount of the cementing material.
Example 3
An additive composition for reducing air bubbles on the surface of hardened high-strength concrete and a preparation and application method thereof,
the component A comprises the following components in percentage by mass: 1% of nano calcium carbonate, 1% of nano calcium silicate hydrate, 20% of micro silicon powder, 25% of fly ash microbeads, 18.467% of mineral powder, 15% of calcium oxide expanding agent, 15% of magnesium oxide expanding agent, 0.03% of maleic anhydride esterified compound, 4.5% of neopentyl glycol and 0.003% of tributyl phosphate.
The component B comprises the following components in percentage by mass: 20% of a low-molecular-weight polycarboxylic water reducer, 25% of a slow-release polycarboxylic water reducer, 2% of sodium formate, 0.03% of a micro-foaming agent, 0.2% of a polyether modified organic silicon defoaming agent, 0.1% of an organic lubricant and 52.67% of water.
The mixing amount of the component A is 30 percent of the total amount of the cementing material, and the mixing amount of the component B is 2.5 percent of the total amount of the cementing material
Effects of the implementation
The additive composition prepared by the invention is designed for solving the problems of more bubbles and large pore diameter on the surface of the hardened high-strength concrete, and aims to effectively reduce the area percentage and the pore diameter of the bubbles on the surface of the hardened high-strength concrete and improve the workability, the volume stability and the appearance quality of the high-strength concrete.
High-strength concrete performance test: the test adopts Xinning P.II 52.5 portland cement, the total consumption of the glue is 590kg/m3The dosage of the natural sand with fineness modulus of 2.8 is 766kg/m3The dosage of the continuous graded broken stone with the particle size of 5-20 mm is 976kg/m3The water consumption for mixing is 136kg/m3(containing water reducing agent or water in component B), the cementing material of comparative example 1 is 100% of cement, the cementing material of comparative example 2 is 70% of cement + 15% of fly ash (grade I) + 15% of mineral powder (grade S95), and the cement is prepared fromThe cementing material of the proportion 3 comprises 70 percent of cement, 5 percent of silica fume, 12.5 percent of fly ash (grade I) and 12.5 percent of mineral powder (grade S95), all the comparative examples adopt a common polycarboxylic acid water reducing agent (the concentration is 20 percent), and the concrete expansion degree is controlled to be 600 +/-20 mm by adjusting the mixing amount of the water reducing agent. The area percentage of the air bubbles on the surface of the hardened concrete and the maximum aperture are tested by firstly collecting photos of the surface of the hardened concrete, then analyzing the photos by adopting Image-Pro-Plus graphic analysis software and calculating the area percentage of the air bubbles and the maximum aperture. The test results are shown in Table 1.
TABLE 1 concrete Performance test results
Although some embodiments of the present invention have been disclosed, they are not intended to limit the present invention, and those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention, such as increasing or decreasing the amount of raw material components or process time, but without substantially affecting the product quality, such changes are also within the scope of the present invention as defined in the appended claims.
Claims (9)
1. An admixture composition for reducing air bubbles on the surface of hardened high-strength concrete, characterized in that: the adhesive comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 10-30: 1;
the component A comprises the following raw materials in percentage by mass:
the component B comprises the following raw materials in percentage by mass:
2. the admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to claim 1, wherein:
the inorganic nano mineral material is a compound of nano calcium carbonate and nano calcium silicate hydrate, and the compound weight percentage is 1: 0.6-1.5.
3. The admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to claim 1, wherein:
the average particle size of the micro silicon powder is 0.5-1.0 mu m, and the content of silicon dioxide is not lower than 92%;
the average particle size of the fly ash microbeads is 2-5 microns;
the 28d activity index of the mineral powder is not lower than 100%, and the average particle size is 10-15 mu m.
4. The admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to claim 1, wherein:
the expanding agent is a mixture of a calcium oxide expanding agent and a magnesium oxide expanding agent, and the calcium oxide expanding agent and the magnesium oxide expanding agent are mixed according to the mass ratio of 1: 1;
the hyperdispersant is one or a mixture of more than one of maleic anhydride esterified substance and polyacrylic ester substance in any proportion.
5. The admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to claim 1, wherein:
the small-molecular-weight polycarboxylic acid water reducing agent is polycarboxylic acid water reducing agent mother liquor with the concentration of 40%, the weight average molecular weight is 25000-30000 g/mol, and the molecular weight distribution PDI is 1.15-1.25.
6. The admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to claim 1, wherein:
the slow-release polycarboxylate water reducer is a polycarboxylate water reducer mother liquor with a concentration of 40% and an enhanced chemical slow-release function;
the retarder is any one or a mixture of two or more of sodium gluconate, sucrose and citric acid in any proportion;
the micro-foaming agent is fatty alcohol polyoxyethylene ether sulfonate.
7. The admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to claim 1, wherein:
the organic lubricant is a water-soluble high molecular polymer, has bridging and recombination functions, and is uniformly isolated and distributed in the cement paste in a manner similar to a space matrix to form a three-dimensional network structure so as to improve the fluidity and stability of the concrete.
8. A method for preparing the admixture composition for reducing air bubbles on the surface of hardened high-strength concrete according to any one of claims 1 to 7, which comprises the following steps:
(1) preparation of component A
(a) Firstly, weighing the inorganic nano mineral material and the hyperdispersant according to the weight ratio, placing the inorganic nano mineral material and the hyperdispersant into a dry powder stirrer, adjusting the speed of the stirrer to be 100-200 revolutions per minute, and stirring for 10-20 minutes;
(b) then weighing the rest raw materials according to the weight ratio, placing the rest raw materials into the dry powder stirrer in the step (a), adjusting the speed of the stirrer to 50-100 revolutions, and stirring for 10-30 minutes to obtain a component A;
(2) preparation of component B
(c) Firstly, weighing a small-molecular-weight polycarboxylic acid water reducer, a slow-release polycarboxylic acid water reducer, a polyether modified organic silicon defoaming agent and water according to a weight ratio, and stirring in a reaction kettle for 10-20 minutes;
(d) and (c) weighing the residual raw materials of the micro-foaming agent, the organic lubricant and the retarder according to the weight ratio, placing the raw materials into the reaction kettle in the step (c), and stirring for 5-10 minutes to obtain a component B.
9. The method of claim 8, comprising the steps of:
(1) the component A replaces the cement or admixture dosage in the concrete mixing proportion in equal quantity and is used as a part of the gelled material;
(2) the using and mixing amount of the component B is 1.0-2.5 percent of the total mass of the concrete cementing material;
(3) the mixing water dosage in the concrete mixing proportion design comprises the corresponding water content of the component B, so the corresponding water content of the component B must be deducted when the mixing water is weighed;
(4) firstly, pre-mixing the component A and a concrete solid raw material for 20-30 seconds;
(5) and (4) simultaneously adding the component B and the mixing water obtained by calculation according to the step (3) into the mixture obtained in the step (4) and mixing for 120-180 seconds.
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Cited By (1)
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| CN116102295A (en) * | 2022-05-17 | 2023-05-12 | 北京建工集团有限责任公司 | Bare concrete and preparation method thereof |
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