CN112279571A - Anti-freezing concrete and preparation method thereof - Google Patents
Anti-freezing concrete and preparation method thereof Download PDFInfo
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- CN112279571A CN112279571A CN202011228640.XA CN202011228640A CN112279571A CN 112279571 A CN112279571 A CN 112279571A CN 202011228640 A CN202011228640 A CN 202011228640A CN 112279571 A CN112279571 A CN 112279571A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention relates to the technical field of building material production, in particular to antifreeze concrete and a preparation method thereof; the composite material consists of the following raw materials in parts by weight: 1480-1550 parts of coarse aggregate, 200-230 parts of cement, 45-55 parts of silica fume, 20-30 parts of fly ash, 13-20 parts of bentonite, 25-40 parts of modified high silica glass fiber, 10-15 parts of magnesium silicate, 8-12 parts of volcanic ash, 0.6-0.8 part of air entraining agent, 36-50 parts of antifreeze agent, 5-8 parts of water reducing agent, 200-230 parts of early strength agent and 130-180 parts of water; the concrete prepared by the invention has good anti-permeability performance and good frost resistance, thereby effectively prolonging the service life of the concrete; in addition, the modified high silica glass fiber is used in combination with silica fume and fly ash, so that the prepared concrete has more excellent mechanical properties.
Description
Technical Field
The invention relates to the technical field of building material production, in particular to antifreezing concrete and a preparation method thereof.
Background
The concrete is an artificial stone material prepared from a cementing material, granular aggregates (water, and optionally additives and admixtures) according to a certain proportion, and the artificial stone material is prepared by uniformly stirring, densely forming, curing and hardening.
The common concrete is an artificial stone material formed by mixing cement, coarse aggregate (broken stone or pebble), fine aggregate (sand), additive and water and hardening. The sand and the stone play a role of a framework in the concrete and inhibit the shrinkage of the cement; the cement and water form cement slurry which is wrapped on the surface of the coarse and fine aggregates and fills gaps among the aggregates. The cement paste has a lubricating effect before hardening, so that the concrete mixture has good working performance, and the aggregates are cemented together after hardening to form a strong whole.
At present, although the concrete prepared in the prior art can be applied to the field of buildings, the frost resistance and the impermeability of the concrete are relatively poor, which seriously influences the service life of the concrete. Moreover, the mechanical properties of the material itself are relatively poor, and further improvement and promotion are still needed.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, it is an object of the present invention to provide a frost-resistant concrete which not only has good impermeability, but also has good frost resistance, thereby effectively prolonging the service life of the concrete. In addition, the modified high silica glass fiber is used in combination with silica fume and fly ash, so that the prepared concrete has more excellent mechanical properties.
In order to achieve the purpose, the invention provides the following technical scheme:
the antifreeze concrete is prepared from the following raw materials in parts by weight: 1480-1550 parts of coarse aggregate, 200-230 parts of cement, 45-55 parts of silica fume, 20-30 parts of fly ash, 13-20 parts of bentonite, 25-40 parts of modified high silica glass fiber, 10-15 parts of magnesium silicate, 8-12 parts of volcanic ash, 0.6-0.8 part of air entraining agent, 36-50 parts of antifreeze agent, 5-8 parts of water reducing agent, 200-230 parts of early strength agent and 130-180 parts of water.
By adopting the technical scheme: according to the invention, the raw materials of coarse aggregate, cement, silica fume, modified high silica glass fiber, magnesium silicate, volcanic ash and the like are adopted, and polyacrylamide is successfully grafted to high silica glass fiber molecules, so that when the prepared modified high silica glass fiber is applied to concrete, the bridging effect of a gel network generated by the prepared modified high silica glass fiber hinders the further deterioration of concrete cracks, the trend of further communication among the cracks is effectively blocked, the impermeability of the concrete prepared by the invention is obviously improved, the frost resistance of the concrete is also effectively improved, and the service life of the concrete is effectively prolonged.
The invention is further configured to: the preparation method of the modified high silica glass fiber comprises the following steps:
i, weighing a proper amount of high silica glass fiber, placing the high silica glass fiber in a reaction kettle, adding a mixed solution with the mass 5-7 times that of the high silica glass fiber into the reaction kettle, then adding 30-36% hydrochloric acid into the kettle to enable the pH of the mixed components to be 4.3-4.8, respectively adding a proper amount of benzoyl peroxide, polyacrylamide and a cross-linking agent into the reaction kettle, and ultrasonically dispersing for 5-10 min at the frequency of 25-35 kHz;
the mixed solution is prepared by mixing acetone and distilled water according to the volume ratio of 1: 6-8; the concentration of benzoyl peroxide in the mixed components was 2.8 x 10-3mol/L, the concentration of polyacrylamide is 0.25-0.36 mol/L, and the concentration of cross-linking agent is 1.2-1.6 vol%;
II, adjusting the temperature in the reaction kettle to 30-40 ℃, soaking the high silica glass fiber at the constant temperature for 70-100 min, then raising the temperature in the reaction kettle to 70-80 ℃, and reacting at the constant temperature for 100-130 min; and after the reaction is finished, taking out the mixture in the kettle, naturally cooling to room temperature, washing a product obtained by the reaction with deionized water, extracting the product with acetone as a solvent for 9-12 hours, washing with deionized water after the extraction is finished, placing the high silica glass fiber obtained after the reaction in a constant temperature drying box, and drying the high silica glass fiber to constant weight at the temperature of 50-60 ℃ to obtain the modified high silica glass fiber finished product.
By adopting the technical scheme: the invention takes modified high silica glass fiber as a raw material for preparing the antifreeze concrete, wherein the high silica glass fiber, benzoyl peroxide, polyacrylamide and a cross-linking agent are dispersed in a mixed solution consisting of acetone and water. Under a certain temperature, the high silica glass fiber and polyacrylamide are subjected to a crosslinking reaction under the action of benzoyl peroxide and a crosslinking agent, so that the polyacrylamide is connected with high silica glass fiber molecules through chemical bonds with larger bond energy by taking the crosslinking agent as a medium, the polyacrylamide is successfully grafted to the surfaces of the high silica glass fiber molecules, and the modified high silica glass fiber is obtained. The high silica glass fiber is subjected to crosslinking modification, so that the three-dimensional network structure of high silica glass fiber molecules is effectively expanded, the toughness of the prepared concrete is improved, and the generation of original cracks in the concrete can be effectively reduced, so that the prepared concrete has more excellent mechanical properties.
The invention is further configured to: the cross-linking agent is any one of glycidoxypropylmethyldimethoxysilane or glycidoxypropylmethyldiethoxysilane.
By adopting the technical scheme: the cross-linking agent and the benzoyl peroxide are used in a matched manner, so that polyacrylamide molecules can be smoothly grafted on the surface of high silica glass fiber molecules, and the modification of the high silica glass fiber is realized.
The invention is further configured to: the air entraining agent is rosin resin air entraining agent or alkyl aromatic hydrocarbon sulfonic acid air entraining agent.
By adopting the technical scheme: the use of the air entraining agent can effectively improve the frost resistance and the impermeability of the concrete prepared by the invention, so that the quality of the concrete prepared by the invention is greatly improved.
The invention is further configured to: the antifreeze agent is any one of calcium chloride and sodium nitrite.
By adopting the technical scheme: the antifreeze agent can effectively reduce the freezing point of the concrete prepared by the invention and improve the antifreeze capacity; meanwhile, the method also has the functions of dissolving ice crystals in the concrete and preventing the ice crystals from growing, and improves the adaptability of the concrete.
The invention is further configured to: the water reducing agent is any one of lignosulfonate, melamine formaldehyde polycondensate or polycarboxylate water reducing agent.
By adopting the technical scheme: the water reducer can reduce the mixing water consumption under the condition of maintaining the concrete slump constant. The water-based dispersing agent has a dispersing effect on cement particles, can improve the workability, reduce the unit water consumption and improve the fluidity of concrete mixtures; or the unit cement consumption is reduced, and the cement is saved.
The invention is further configured to: the early strength agent is any one of sodium chloride or sodium sulfate.
By adopting the technical scheme: the use of the early strength agent can accelerate the hydration speed of the concrete and promote the development of the early strength of the concrete; the concrete has the advantages of early strength function, certain water reducing and enhancing functions and no obvious influence on the later strength of the concrete.
Another object of the present invention is to provide a method for preparing a frost-resistant concrete, comprising the steps of:
s1, accurately weighing the raw materials according to the weight parts, respectively adding coarse aggregate, cement, silica fume, fly ash, bentonite, magnesium silicate, volcanic ash, an air entraining agent, an antifreeze agent and half of water by mass into a stirrer, stirring at the rotating speed of 100-200 r/min for 20-30 min, and after stirring, marking the mixture in the stirrer as a mixed material;
s2, adding the water reducing agent, the balance of water and the balance of raw materials into the mixed materials in the stirrer, continuously stirring for 10-15 min at a rotating speed of 120-180 r/min, then stopping stirring for 2-3 min, scraping the residual cement mortar on the blades of the stirring pot and the pot wall into the stirring pot by using a slotting tool, and finally stirring for 8-15 min at a rotating speed of 300-480 r/min; then filling the stirred concrete into a test mold;
and S3, covering a waterproof film on the surface of the concrete, carrying out film covering maintenance for 3d, then demoulding after mould stripping and standard maintenance or steam maintenance, and then putting the concrete into a standard condition maintenance box for maintenance to a set age to obtain the frost-resistant concrete.
By adopting the technical scheme: the concrete prepared by the invention has good anti-permeability performance and good frost resistance, thereby effectively prolonging the service life of the concrete. In addition, the modified high silica glass fiber is used in combination with silica fume and fly ash, so that the prepared concrete has more excellent mechanical properties.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
1. the high silica glass fiber is subjected to a crosslinking reaction with polyacrylamide under the action of benzoyl peroxide and a crosslinking agent, so that the polyacrylamide is connected with high silica glass fiber molecules through chemical bonds with larger bond energy by taking the crosslinking agent as a medium, the polyacrylamide is successfully grafted to the surfaces of the high silica glass fiber molecules, and the modified high silica glass fiber is successfully obtained. The high silica glass fiber is subjected to crosslinking modification, so that the three-dimensional network structure of high silica glass fiber molecules is effectively expanded, the toughness of the prepared concrete is improved, and the generation of original cracks in the concrete can be effectively reduced. The modified high silica glass fiber is used in combination with silica fume and fly ash, so that the prepared concrete has more excellent mechanical properties;
2. the polyacrylamide is successfully grafted to the high silica glass fiber molecules, so that when the prepared modified high silica glass fiber is applied to concrete, the bridging effect of a gel network generated by the modified high silica glass fiber prevents the further deterioration of concrete cracks, effectively blocks the trend of further communication among all the cracks, obviously improves the impermeability of the concrete prepared by the invention, and also effectively improves the frost resistance of the concrete, thereby effectively prolonging the service life of the concrete.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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 present invention will be further described with reference to the following examples.
Example 1
The antifreeze concrete is prepared from the following raw materials in parts by weight: 1480 parts of coarse aggregate, 200 parts of cement, 45 parts of silica fume, 20 parts of fly ash, 13 parts of bentonite, 25 parts of modified high silica glass fiber, 10 parts of magnesium silicate, 8 parts of volcanic ash, 0.6 part of air entraining agent, 36 parts of antifreeze agent, 5 parts of water reducing agent, 200 parts of early strength agent and 130 parts of water.
The preparation method of the modified high silica glass fiber comprises the following steps:
i, weighing a proper amount of high silica glass fiber and placing the high silica glass fiber in a reaction kettle, adding mixed liquid with the mass 5 times that of the high silica glass fiber into the reaction kettle, then adding 30% hydrochloric acid into the kettle to enable the pH value of the mixed components to be 4.3, respectively adding a proper amount of benzoyl peroxide, polyacrylamide and a cross-linking agent into the reaction kettle, and carrying out ultrasonic dispersion for 5min at the frequency of 25 kHz;
wherein the mixed solution is prepared by mixing acetone and distilled water according to the volume ratio of 1: 6; the concentration of benzoyl peroxide in the mixed components was 2.4 x 10-3mol/L, the concentration of polyacrylamide is 0.25mol/L, and the concentration of cross-linking agent is 1.2 vol%;
II, regulating the temperature in the reaction kettle to 30 ℃, soaking the high silica glass fiber at the constant temperature for 70min, then raising the temperature in the reaction kettle to 70 ℃, and reacting at the constant temperature for 100 min; and after the reaction is finished, taking out the mixture in the kettle, naturally cooling to room temperature, washing a product obtained by the reaction with deionized water, extracting the product for 9 hours by using acetone as a solvent, washing with deionized water after the extraction is finished, placing the high silica glass fiber obtained after the reaction in a constant-temperature drying box, and drying the high silica glass fiber to constant weight at the temperature of 50 ℃ to obtain the finished modified high silica glass fiber.
The cross-linking agent is glycidoxypropylmethyldimethoxysilane.
The air entraining agent is rosin resin air entraining agent.
The antifreeze agent is calcium chloride.
The water reducing agent is lignosulfonate.
The early strength agent is sodium chloride.
A preparation method of frost-resistant concrete comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts, respectively adding coarse aggregate, cement, silica fume, fly ash, bentonite, magnesium silicate, volcanic ash, an air entraining agent, an antifreeze agent and half of water by mass into a stirrer, stirring for 20min at a rotating speed of 100r/min, and marking the mixture in the stirrer as a mixed material after the stirring is finished;
s2, adding the water reducing agent, the balance of water and the balance of raw materials into the mixed materials in the stirrer, continuing to stir at the rotating speed of 120r/min for 10min, then stopping stirring for 2min, scraping the blades of the stirring pot and the residual cement mortar on the pot wall into the stirring pot by using a slotting tool, and finally stirring at the rotating speed of 300r/min for 8 min; then filling the stirred concrete into a test mold;
and S3, covering a waterproof film on the surface of the concrete, carrying out film covering maintenance for 3d, then demoulding after mould stripping and standard maintenance or steam maintenance, and then putting the concrete into a standard condition maintenance box for maintenance to a set age to obtain the frost-resistant concrete.
Example 2
The antifreeze concrete is prepared from the following raw materials in parts by weight: 1500 parts of coarse aggregate, 210 parts of cement, 50 parts of silica fume, 25 parts of fly ash, 15 parts of bentonite, 30 parts of modified high silica glass fiber, 12 parts of magnesium silicate, 10 parts of volcanic ash, 0.7 part of air entraining agent, 40 parts of anti-freezing agent, 6 parts of water reducing agent, 210 parts of early strength agent and 150 parts of water.
The preparation method of the modified high silica glass fiber comprises the following steps:
i, weighing a proper amount of high silica glass fiber and placing the high silica glass fiber in a reaction kettle, adding a mixed solution with the mass 6 times that of the high silica glass fiber into the reaction kettle, then adding 33% hydrochloric acid into the kettle to enable the pH of the mixed components to be 4.5, respectively adding a proper amount of benzoyl peroxide, polyacrylamide and a cross-linking agent into the reaction kettle, and ultrasonically dispersing for 8min at the frequency of 30 kHz;
wherein the mixed solution is prepared by mixing acetone and distilled water according to the volume ratio of 1: 7; the concentration of benzoyl peroxide in the mixed components was 2.6 x 10-3mol/L, the concentration of polyacrylamide is 0.30mol/L, and the concentration of cross-linking agent is 1.4 vol%;
II, adjusting the temperature in the reaction kettle to 35 ℃, soaking the high silica glass fiber at the constant temperature for 80min, then raising the temperature in the reaction kettle to 75 ℃, and reacting at the constant temperature for 120 min; and after the reaction is finished, taking out the mixture in the kettle, naturally cooling to room temperature, washing a product obtained by the reaction with deionized water, extracting the product for 10 hours by using acetone as a solvent, washing with deionized water after the extraction is finished, placing the high silica glass fiber obtained after the reaction in a constant-temperature drying box, and drying the high silica glass fiber to constant weight at the temperature of 55 ℃ to obtain the finished modified high silica glass fiber.
The crosslinking agent is glycidoxypropylmethyldiethoxysilane.
The air entraining agent is alkyl arene sulfonic acid air entraining agent.
The antifreeze agent is sodium nitrite.
The water reducing agent is melamine formaldehyde polycondensate water reducing agent.
The early strength agent is sodium sulfate.
A preparation method of frost-resistant concrete comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts, respectively adding coarse aggregate, cement, silica fume, fly ash, bentonite, magnesium silicate, volcanic ash, an air entraining agent, an antifreeze agent and half of water by mass into a stirrer, stirring for 25min at a rotating speed of 150r/min, and marking the mixture in the stirrer as a mixed material after the stirring is finished;
s2, adding the water reducing agent, the balance of water and the balance of raw materials into the mixed materials in the stirrer, continuing to stir at the rotating speed of 150r/min for 12min, then stopping stirring for 2min, scraping the blades of the stirring pot and the residual cement mortar on the pot wall into the stirring pot by using a slotting tool, and finally stirring at the rotating speed of 420r/min for 10 min; then filling the stirred concrete into a test mold;
and S3, covering a waterproof film on the surface of the concrete, carrying out film covering maintenance for 3d, then demoulding after mould stripping and standard maintenance or steam maintenance, and then putting the concrete into a standard condition maintenance box for maintenance to a set age to obtain the frost-resistant concrete.
Example 3
The antifreeze concrete is prepared from the following raw materials in parts by weight: 1480-1550 parts of coarse aggregate, 230 parts of cement, 55 parts of silica fume, 30 parts of fly ash, 20 parts of bentonite, 40 parts of modified high silica glass fiber, 15 parts of magnesium silicate, 12 parts of volcanic ash, 0.8 part of air entraining agent, 50 parts of antifreeze agent, 8 parts of water reducing agent, 230 parts of early strength agent and 180 parts of water.
The preparation method of the modified high silica glass fiber comprises the following steps:
i, weighing a proper amount of high silica glass fiber and placing the high silica glass fiber in a reaction kettle, adding a mixed solution with the mass 7 times that of the high silica glass fiber into the reaction kettle, then adding hydrochloric acid with the concentration of 36% into the kettle to enable the pH value of the mixed component to be 4.8, respectively adding a proper amount of benzoyl peroxide, polyacrylamide and a cross-linking agent into the reaction kettle, and carrying out ultrasonic dispersion for 10min at the frequency of 35 kHz;
wherein the mixed solution is prepared by mixing acetone and distilled water according to the volume ratio of 1: 8; the concentration of benzoyl peroxide in the mixed components was 2.8 x 10-3mol/L, the concentration of polyacrylamide is 0.36mol/L, and the concentration of cross-linking agent is 1.6 vol%;
II, regulating the temperature in the reaction kettle to 40 ℃, soaking the high silica glass fiber at the constant temperature for 100min, then raising the temperature in the reaction kettle to 80 ℃, and reacting at the constant temperature for 130 min; and after the reaction is finished, taking out the mixture in the kettle, naturally cooling to room temperature, washing a product obtained by the reaction with deionized water, extracting the product for 12 hours by using acetone as a solvent, washing with deionized water after the extraction is finished, placing the high silica glass fiber obtained after the reaction in a constant-temperature drying box, and drying the high silica glass fiber to constant weight at the temperature of 60 ℃ to obtain the finished modified high silica glass fiber.
The cross-linking agent is glycidoxypropylmethyldimethoxysilane.
The air entraining agent is rosin resin air entraining agent.
The antifreeze agent is calcium chloride.
The water reducing agent is a polycarboxylate water reducing agent.
The early strength agent is sodium chloride.
A preparation method of frost-resistant concrete comprises the following steps:
s1, accurately weighing the raw materials according to the weight parts, respectively adding coarse aggregate, cement, silica fume, fly ash, bentonite, magnesium silicate, volcanic ash, an air entraining agent, an antifreeze agent and half of water by mass into a stirrer, stirring for 30min at a rotating speed of 200r/min, and marking the mixture in the stirrer as a mixed material after the stirring is finished;
s2, adding the water reducing agent, the balance of water and the balance of raw materials into the mixed materials in the stirrer, continuing to stir for 15min at a rotating speed of 180r/min, then stopping stirring for 3min, scraping the blades of the stirring pot and the residual cement mortar on the pot wall into the stirring pot by using a slotting tool, and finally stirring for 15min at a rotating speed of 480 r/min; then filling the stirred concrete into a test mold;
and S3, covering a waterproof film on the surface of the concrete, carrying out film covering maintenance for 3d, then demoulding after mould stripping and standard maintenance or steam maintenance, and then putting the concrete into a standard condition maintenance box for maintenance to a set age to obtain the frost-resistant concrete.
Performance testing
Comparative example: a concrete product produced by a concrete limited company of zhengzhou city, henna;
example (b): concrete products prepared according to the present invention in example 1, example 2 and example 3;
and (3) performing freeze-thaw tests according to a quick freezing method in a general concrete mechanical property test method (GBJ81-85), and stopping the tests when the number of freeze-thaw times reaches 200.
1. Freeze-thaw cycle mass loss rate: the high-strength frost-resistant concrete subjected to the freeze-thaw test is tested according to the national standard GB/T11973-1997.
2. Breaking strength: detecting according to GB/T50081-2002 standard of common concrete mechanical property test method;
3. compressive strength: detecting according to GB/T50081-2002 standard of common concrete mechanical property test method;
4. according to JTGE30-2005 Highway engineering cement and cement concrete test regulations, forming a test piece as required, maintaining the test piece to a specified age, mounting the sealed test piece on an impermeability instrument, pressurizing the test piece from 0.1MPa, increasing the water pressure of 0.1MPa every 8h, and observing the water seepage condition of the end face of the test piece at any time. Pressurizing until the surface of 3 test pieces among 6 test pieces is seeped, recording the water pressure at the moment, and stopping the test.
The test data obtained in the comparative examples and examples 1 to 3 are recorded in the following table:
as can be seen from the relevant data in the table above, the concrete prepared according to the technical scheme provided by the invention has obviously better freezing resistance, impermeability and mechanical properties than the concrete product provided by the comparative example. Therefore, the antifreeze concrete prepared by the invention and the preparation method thereof have wider market prospect and are more suitable for popularization.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. The antifreeze concrete is characterized by comprising the following raw materials in parts by weight: 1480-1550 parts of coarse aggregate, 200-230 parts of cement, 45-55 parts of silica fume, 20-30 parts of fly ash, 13-20 parts of bentonite, 25-40 parts of modified high silica glass fiber, 10-15 parts of magnesium silicate, 8-12 parts of volcanic ash, 0.6-0.8 part of air entraining agent, 36-50 parts of antifreeze agent, 5-8 parts of water reducing agent, 200-230 parts of early strength agent and 130-180 parts of water.
2. The frost-resistant concrete according to claim 1, wherein the modified high silica glass fiber is prepared by a method comprising:
i, weighing a proper amount of high silica glass fiber, placing the high silica glass fiber in a reaction kettle, adding a mixed solution with the mass 5-7 times that of the high silica glass fiber into the reaction kettle, then adding 30-36% hydrochloric acid into the kettle to enable the pH of the mixed components to be 4.3-4.8, respectively adding a proper amount of benzoyl peroxide, polyacrylamide and a cross-linking agent into the reaction kettle, and ultrasonically dispersing for 5-10 min at the frequency of 25-35 kHz;
the mixed solution is prepared by mixing acetone and distilled water according to the volume ratio of 1: 6-8; the concentration of benzoyl peroxide in the mixed components is 2.4-2.8 x 10-3mol/L, the concentration of polyacrylamide is 0.25-0.36 mol/L, and the concentration of cross-linking agent is 1.2-1.6 vol%;
II, adjusting the temperature in the reaction kettle to 30-40 ℃, soaking the high silica glass fiber at the constant temperature for 70-100 min, then raising the temperature in the reaction kettle to 70-80 ℃, and reacting at the constant temperature for 100-130 min; and after the reaction is finished, taking out the mixture in the kettle, naturally cooling to room temperature, washing a product obtained by the reaction with deionized water, extracting the product with acetone as a solvent for 9-12 hours, washing with deionized water after the extraction is finished, placing the high silica glass fiber obtained after the reaction in a constant temperature drying box, and drying the high silica glass fiber to constant weight at the temperature of 50-60 ℃ to obtain the modified high silica glass fiber finished product.
3. Frost resistant concrete according to claim 1, characterized in that: the cross-linking agent is any one of glycidoxypropylmethyldimethoxysilane or glycidoxypropylmethyldiethoxysilane.
4. Frost resistant concrete according to claim 1, characterized in that: the air entraining agent is rosin resin air entraining agent or alkyl aromatic hydrocarbon sulfonic acid air entraining agent.
5. Frost resistant concrete according to claim 1, characterized in that: the antifreeze agent is any one of calcium chloride and sodium nitrite.
6. Frost resistant concrete according to claim 1, characterized in that: the water reducing agent is any one of lignosulfonate, melamine formaldehyde polycondensate or polycarboxylate water reducing agent.
7. Frost resistant concrete according to claim 1, characterized in that: the early strength agent is any one of sodium chloride or sodium sulfate.
8. A method of producing frost-resistant concrete according to claim 1, comprising the steps of:
s1, accurately weighing the raw materials according to the weight parts, respectively adding coarse aggregate, cement, silica fume, fly ash, bentonite, magnesium silicate, volcanic ash, an air entraining agent, an antifreeze agent and half of water by mass into a stirrer, stirring at the rotating speed of 100-200 r/min for 20-30 min, and after stirring, marking the mixture in the stirrer as a mixed material;
s2, adding the water reducing agent, the balance of water and the balance of raw materials into the mixed materials in the stirrer, continuously stirring for 10-15 min at a rotating speed of 120-180 r/min, then stopping stirring for 2-3 min, scraping the residual cement mortar on the blades of the stirring pot and the pot wall into the stirring pot by using a slotting tool, and finally stirring for 8-15 min at a rotating speed of 300-480 r/min; then filling the stirred concrete into a test mold;
and S3, covering a waterproof film on the surface of the concrete, carrying out film covering maintenance for 3d, then demoulding after mould stripping and standard maintenance or steam maintenance, and then putting the concrete into a standard condition maintenance box for maintenance to a set age to obtain the frost-resistant concrete.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480264A (en) * | 2021-07-26 | 2021-10-08 | 中建西部建设新疆有限公司 | Ultra-long structure construction anti-crack concrete and preparation method thereof |
| CN116239333A (en) * | 2023-05-11 | 2023-06-09 | 湖南高翔新材料有限公司 | Production process of antifreeze concrete additive |
-
2020
- 2020-11-06 CN CN202011228640.XA patent/CN112279571A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480264A (en) * | 2021-07-26 | 2021-10-08 | 中建西部建设新疆有限公司 | Ultra-long structure construction anti-crack concrete and preparation method thereof |
| CN116239333A (en) * | 2023-05-11 | 2023-06-09 | 湖南高翔新材料有限公司 | Production process of antifreeze concrete additive |
| CN116239333B (en) * | 2023-05-11 | 2023-07-07 | 湖南高翔新材料有限公司 | Production process of antifreeze concrete additive |
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