CN114105547A - Water-dispersion-resistant concrete and preparation method thereof - Google Patents
Water-dispersion-resistant concrete and preparation method thereof Download PDFInfo
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- CN114105547A CN114105547A CN202111618953.0A CN202111618953A CN114105547A CN 114105547 A CN114105547 A CN 114105547A CN 202111618953 A CN202111618953 A CN 202111618953A CN 114105547 A CN114105547 A CN 114105547A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building materials, and particularly relates to a water-dispersion-resistant concrete and a preparation method thereof, wherein the water-dispersion-resistant concrete comprises the following components in parts by weight: 300-600 parts of cement; 60-200 parts of fly ash; 600-800 parts of recycled fine aggregate; 800-1100 parts of recycled coarse aggregate; 100-200 parts of regenerated micro powder; 5-15 parts of a water reducing agent; 100-200 parts of metakaolin; 160-240 parts of modified nano silicon oxide dispersion liquid; 3-10 parts of organosilane; 1-5 parts of polyvinyl alcohol; 5-15 parts of polymethyl acrylate; 3-5 parts of triethanolamine; 1-3 parts of polyacrylamide; 1-5 parts of polyethylene glycol and 0-6 parts of synthetic fiber. The water-dispersion-resistant concrete provided by the invention realizes direct pouring of the concrete in water, is not separated when meeting water, is not lost, can automatically level and self-compact when entering water, does not need vibration, does not pollute the environment of a construction water area, has uniform and reliable concrete quality, and has obvious positive effects on the durability, the workability and the cost control of the underwater concrete.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to concrete, and particularly relates to water-dispersion-resistant concrete and a preparation method thereof.
Background
Heretofore, concrete has remained one of the most dominant and most used building materials in underwater construction. The performance of concrete will directly affect the quality and progress of underwater work. When ordinary concrete is directly poured in a water environment, the effects of separation, cement loss and strength reduction can be caused by the influence of water, and environmental pollution can be caused. The cofferdam water-isolation method is usually adopted to solve the problem of underwater concrete pouring, but the method can complicate the construction process, prolong the construction period, greatly increase the engineering cost and hardly ensure the quality of the underwater concrete.
In view of the defects existing in the existing underwater concrete, the inventor of the invention actively researches and innovates based on practical experience and professional knowledge which are abundant for many years in the design and manufacture of the products, and by matching with the application of theories, so as to create the water-dispersion-resistant concrete and the preparation method thereof, realize the modification of the concrete, ensure that the concrete can still enable the cement to bond the aggregates together and continuously hydrate in the water environment, further realize the direct pouring of the concrete in the water, have no segregation when meeting water, no loss of the cement, can automatically level and self-compact when entering the water, do not need to vibrate, have no environmental pollution to the construction water area, have uniform and reliable concrete quality, and have obvious positive influence on the durability, the workability and the cost control of the underwater concrete.
Disclosure of Invention
The invention aims to provide a water dispersion resistant concrete, which is characterized in that a certain amount of dispersion resistant additive is added in the concrete stirring process, so that the concrete is modified, cement can be used for cementing aggregates together and continuously hydrating in water environment, the concrete can be directly poured in water, the concrete can be automatically leveled and self-compacted when entering water, the cement does not segregate and run off when meeting water, the concrete can be automatically leveled and self-compacted when entering water, the vibration is not needed, the construction water area is not polluted by the environment, the concrete quality is uniform and reliable, and the durability, the workability and the cost control of the underwater concrete are obviously positively influenced.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a water-dispersion-resistant concrete and a preparation method thereof, wherein the water-dispersion-resistant concrete is prepared by uniformly mixing the following components in corresponding weight ratio: 300-600 parts of cement; 60-200 parts of fly ash; 600-800 parts of recycled fine aggregate; 800-1100 parts of recycled coarse aggregate; 100-200 parts of regenerated micro powder; 5-15 parts of a water reducing agent; 100-200 parts of metakaolin; 160-240 parts of modified nano silicon oxide dispersion liquid; 3-10 parts of organosilane; 1-5 parts of polyvinyl alcohol; 5-15 parts of polymethyl acrylate; 3-5 parts of triethanolamine; 1-3 parts of polyacrylamide; 1-5 parts of polyethylene glycol; 0-6 parts of synthetic fibers. The invention adopts the regenerated coarse and fine aggregate and the regenerated micro powder, and simultaneously adopts metakaolin, modified nano silicon oxide dispersion liquid, organosilane, polyvinyl alcohol, polymethyl acrylate, polyacrylamide, polyethylene glycol, synthetic fiber and triethanolamine to obtain the water-dispersion-resistant concrete with high strength, good durability and good compactness under the underwater forming condition. In the modified nano silicon oxide dispersion liquid, the modified nano silicon oxide not only contains hydrophilic groups, so that the modified nano silicon oxide has better compatibility with cement and is prevented from agglomerating; the modified nano silicon oxide surface also contains a large amount of Si-OH bonds, hydrogen bonds can be formed between polyvinyl alcohol and polymethyl acrylate, the hydrogen bonds and silicon oxygen bonds form a network structure together, the fluidity of the system is limited, the viscosity of the system is increased, cement is enabled to bond aggregates together and to be hydrated continuously, under the action of shearing force, the network structure between the hydrogen bonds and the silicon oxygen bonds is damaged, the viscosity of the system is reduced, a thixotropic effect is generated, the purposes of self-leveling and no need of vibration are achieved, when the shearing force is eliminated, the network between the hydrogen bonds and the silicon oxygen bonds is regenerated, the cement and the aggregates are prevented from being dispersed, and the self-compacting effect is achieved.
Further, the maximum particle size of the recycled coarse aggregate is not more than 25mm, the mud content is not more than 0.5 percent, and the apparent density is not less than 2200kg/m3And the water absorption rate is not more than 8%.
Further, the content of mud blocks of the recycled fine aggregate is not more than 1.0%, and the apparent density is not less than 2200kg/m3And the water absorption rate is not more than 10%.
Furthermore, the water demand ratio of the regenerated micro powder is not more than 105 percent, and the 45 mu m screen residue is not more than 30 percent.
Further, the metakaolin has an average particle size of not greater than 80 μm.
Further, the modified nano silicon oxide dispersion liquid contains 10-20% of solid, the average diameter of particles is 5-10 nm, and the specific surface area is 300-1200 m2/g。
Further, the modifying agent for modifying the nano silicon oxide in the modified nano silicon oxide dispersion liquid provided by the invention is tridecafluorooctyltriethoxysilane. Because the surface of the nano silicon oxide contains a large amount of hydrophilic groups, the compatibility between the nano silicon oxide and inorganic materials is poor, and the agglomeration phenomenon is easily caused, the nano silicon oxide is modified by adopting tridecafluorooctyltriethoxysilane, but the modification can occupy Si-OH on the surface of the nano silicon oxide, if the modification is excessively occupied, the formation of hydrogen bonds between polymethyl acrylate and the nano silicon oxide in a system can be influenced, the viscosity of the system is reduced, and the viscosity which is not dispersed when cement is combined with aggregate can not be achieved. Therefore, the modification rate of the modified nano silicon oxide is accurately controlled, so that the modified nano silicon oxide can keep good compatibility with inorganic materials and can improve the viscosity of a system. In order to ensure the viscosity of the system, the calculation formula of the modification rate of the modified nano-silica is as follows:
Further, a is determined by the molecular weight of polymethyl acrylate, and specifically comprises the following steps: a-polymethyl acrylate molecular weight/1000. The higher the molecular weight of the polymethyl acrylate is, the higher the viscosity of the polymethyl acrylate is, so that when the viscosity of the polymethyl acrylate is higher, the viscosity of the system can meet the requirements of underwater concrete even if the occupancy rate of Si-OH in the modified nano silicon dioxide is high.
Further, the amount of tridecafluorooctyltriethoxysilane to be used may be selected depending on the modification ratio.
Furthermore, the organosilane is in a liquid state, has good dispersibility, has the content of not less than 99 percent, and has the content of hydrolyzable oxide of not more than 100 ppm.
Further, the molecular weight of the polyvinyl alcohol is not less than 150000.
Furthermore, the molecular weight of the polymethyl acrylate is 10000-30000.
Further, polyacrylamide is of an anionic type and has a molecular weight of not less than 12000000.
Furthermore, the molecular weight of the polyethylene glycol is 400-2000.
Furthermore, the synthetic fiber is composed of one or more of polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber or carbon fiber, and the length of the synthetic fiber is 6-30 mm.
The second purpose of the invention is to provide a preparation method of the water-dispersion-resistant concrete, which has the same technical effect.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of water-dispersion-resistant concrete comprises the following steps:
(1) weighing the components according to the raw material ratio, adding the weighed cement, fly ash, recycled fine aggregate, recycled coarse aggregate, recycled micro powder, metakaolin and synthetic fiber, and stirring for 2-3 min;
(2) adding a water reducing agent, a modified nano silicon oxide dispersion liquid, organosilane and polyvinyl alcohol into the product obtained in the step (1), and stirring for 3-5 min;
(3) adding polymethyl acrylate, triethanolamine, polyacrylamide and polyethylene glycol into the product obtained in the step (2), stirring for 5-10 min, and fully mixing to form a water-dispersion-resistant concrete mixture;
(4) molding the mixture obtained in the step (3) in an underwater environment, and curing at normal temperature in the underwater environment for not less than 3 days; and curing to a specified age to form finished concrete, wherein the compressive strength of the test piece subjected to standard curing of the water-dispersion-resistant concrete in the 28d age can reach over 50 MPa.
According to the technical scheme, the raw materials with large proportions, such as the cementing material, the aggregate, the mineral additive, the fiber and the like, can be fully premixed in advance through the step (1), so that the uniformity of the whole material of the water-dispersion-resistant concrete is ensured, and the problems of high and low strength, inconsistent water-dispersion-resistant effect and the like caused by uneven mixing of the raw materials are avoided.
On the basis of the full and uniform mixing in the step (1), the concrete mixture has good fluidity by adding the water reducing agent in the step (2), and meanwhile, the concrete has good hydrophobic effect and good fluidity by adding the modified nano silicon oxide dispersion liquid, the organosilane, the polyvinyl alcohol and the like.
On the basis that the concrete in the step (2) has good fluidity, the polymethyl acrylate, the triethanolamine, the polyacrylamide and the polyethylene glycol are added to enable the concrete to have good water dispersion resistance, the fluidity of the concrete can be reduced due to the addition of the raw materials belonging to the step (3), the fluidity of the concrete is improved by firstly carrying out the step (2), and then the uniformity of the concrete mixture is easily ensured by carrying out the step (3) in a mode of improving the water dispersion resistance of the concrete and simultaneously reducing a certain fluidity.
In conclusion, the invention has the following beneficial effects:
the invention adopts modified nano silicon oxide dispersion liquid, organosilane and polyvinyl alcohol to carry out surface modification on the recycled fine aggregate and the recycled coarse aggregate, thereby reducing the adsorption performance of the recycled coarse and fine aggregate and enabling the concrete mixture to have certain hydrophobic performance; meanwhile, the thickening and viscosity increasing performance, the water dispersion resistance and the early strength of the concrete mixture are obviously improved by respectively adopting polymethyl acrylate, polyacrylamide, polyethylene glycol, synthetic fiber and triethanolamine. The invention uses the recycled coarse and fine aggregate and the recycled fine powder as partial raw materials for preparing the water-resistant dispersion concrete, and can achieve higher hydrophobic performance and durability by means of modifying the nano silicon oxide dispersion liquid, organosilane, polyvinyl alcohol and polymethyl acrylate, the technical approach is novel, the cost is reduced, and the invention is convenient for real engineering popularization.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the concrete for resisting water dispersion and the preparation method thereof according to the present invention, the specific embodiments, the characteristics and the effects thereof are described in detail as follows.
The specification of the raw materials used in the present embodiment is as follows:
continuous gradation of recycled coarse aggregate with maximum particle size not greater than 25mm, mud content not greater than 0.5%, and apparent density not less than 2200kg/m3And the water absorption rate is not more than 8%.
The content of mud blocks of the recycled fine aggregate is not more than 1.0 percent, and the apparent density is not less than 2200kg/m3And the water absorption rate is not more than 10%.
The water demand ratio of the regenerated micro powder is not more than 105 percent, and the residue of the 45 mu m sieve is not more than 30 percent.
The metakaolin has an average particle size of not greater than 80 μm.
The modified nano silicon oxide dispersion liquid contains 10-20% of solid, has an average particle diameter of 5-10 nm, and has a specific surface area of 300-1200 m2/g。
The organosilane is in liquid form, has a purity of not less than 99% and a hydrolyzable oxide content of not more than 100 ppm.
The molecular weight of the polyvinyl alcohol is not less than 150000.
The molecular weight of the polymethyl acrylate is 10000-30000.
The polyacrylamide is in anionic type, and the molecular weight is not lower than 12000000.
Polyethylene glycol with molecular weight of 400-2000.
The length of the synthetic fiber is 6-30 mm.
Example 1
The water-dispersion-resistant concrete comprises the following components in parts by weight: 300 parts of cement; 60 parts of fly ash; 600 parts of recycled fine aggregate; 800 parts of recycled coarse aggregate; 100 parts of regenerated micro powder; 5 parts of a water reducing agent; 100 parts of metakaolin; 160 parts of modified nano silicon oxide dispersion liquid; 3 parts of organosilane; 1 part of polyvinyl alcohol and 5 parts of polymethyl acrylate; 3 parts of triethanolamine; 1 part of polyacrylamide; 1 part of polyethylene glycol and 6 parts of polypropylene fiber.
The preparation method comprises the following steps:
(1) weighing the components according to the raw material ratio, adding the weighed cement, fly ash, recycled fine aggregate, recycled coarse aggregate, recycled micro powder, metakaolin and synthetic fiber, and stirring for 2 min;
(2) adding a water reducing agent, a modified nano silicon oxide dispersion liquid, organosilane and polyvinyl alcohol into the product obtained in the step (1), and stirring for 3 min;
(3) adding polymethyl acrylate, triethanolamine, polyacrylamide and polyethylene glycol into the product obtained in the step (2), stirring for 5min, and fully mixing to form a water-dispersion-resistant concrete mixture;
(4) respectively forming the mixture obtained in the step (3) into an underwater concrete test block and a land concrete test block according to the standard GB/T37990-2019, and maintaining for not less than 3 d; and curing to a specified age to form the finished concrete.
Example 2
The water-dispersion-resistant concrete comprises the following components in parts by weight: 600 parts of cement; 200 parts of fly ash; 800 parts of recycled fine aggregate; 1100 parts of recycled coarse aggregate; 200 parts of regenerated micro powder; 15 parts of a water reducing agent; 200 parts of metakaolin; 240 parts of modified nano silicon oxide dispersion liquid; 10 parts of organosilane; 5 parts of polyvinyl alcohol and 15 parts of polymethyl acrylate; 5 parts of triethanolamine; 3 parts of polyacrylamide; 5 parts of polyethylene glycol and 6 parts of polyvinyl alcohol fiber.
(1) Weighing the components according to the raw material ratio, adding the weighed cement, fly ash, recycled fine aggregate, recycled coarse aggregate, recycled micro powder, metakaolin and synthetic fiber, and stirring for 2 min;
(2) adding a water reducing agent, a modified nano silicon oxide dispersion liquid, organosilane and polyvinyl alcohol into the product obtained in the step (1), and stirring for 3 min;
(3) adding polymethyl acrylate, triethanolamine, polyacrylamide and polyethylene glycol into the product obtained in the step (2), stirring for 5min, and fully mixing to form a water-dispersion-resistant concrete mixture;
(4) respectively forming the mixture obtained in the step (3) into an underwater concrete test block and a land concrete test block according to the standard GB/T37990-2019, and maintaining for not less than 3 d; and curing to a specified age to form the finished concrete.
Example 3
The water-dispersion-resistant concrete comprises the following components in parts by weight: 400 parts of cement; 100 parts of fly ash; 750 parts of recycled fine aggregate; 1000 parts of recycled coarse aggregate; 150 parts of regenerated micro powder; 10 parts of a water reducing agent; 150 parts of metakaolin; 180 parts of modified nano silicon oxide dispersion liquid; 6 parts of organosilane; 3 parts of polyvinyl alcohol; 10 parts of polymethyl acrylate; 4 parts of triethanolamine; 23 parts of polyacrylamide; 3 parts of polyethylene glycol and 6 parts of synthetic fiber.
(1) Weighing the components according to the raw material ratio, adding the weighed cement, fly ash, recycled fine aggregate, recycled coarse aggregate, recycled micro powder, metakaolin and synthetic fiber, and stirring for 2 min;
(2) adding a water reducing agent, a modified nano silicon oxide dispersion liquid, organosilane and polyvinyl alcohol into the product obtained in the step (1), and stirring for 3 min;
(3) adding polymethyl acrylate, triethanolamine, polyacrylamide and polyethylene glycol into the product obtained in the step (2), stirring for 5min, and fully mixing to form a water-dispersion-resistant concrete mixture;
(4) respectively forming the mixture obtained in the step (3) into an underwater concrete test block and a land concrete test block according to the standard GB/T37990-2019, and maintaining for not less than 3 d; and curing to a specified age to form the finished concrete.
Wherein the modifier for modifying the nano silicon dioxide is tridecafluorooctyltriethoxysilane, and the modification rate is shown by a formula
Calculating, wherein C is the modification rate of the tridecafluorooctyltriethoxysilane to the nano silicon oxide; w1Is the weight portion of polymethyl acrylate in the system; w2Is the sum of the weight parts of the recycled coarse aggregate and the recycled fine aggregate in the system; w3Is the adding amount of the modified nano silicon dioxide in the system; eta1Is the kinematic viscosity of the polymethyl acrylate in the system of the invention at 40 ℃; eta2Is the kinematic viscosity of the Portland cement in the system of the invention at 40 ℃; a is coefficient, specifically molecular weight of polymethyl acrylate/1000, b is solid content of modified nano silicon dioxide, wherein eta1And η2Can be obtained by field test.
Comparative example 1
The common underwater casting concrete comprises the following components in parts by weight: 420 parts of cement; 100 parts of fly ash; 700 parts of recycled fine aggregate; 1000 parts of recycled coarse aggregate; 100 parts of regenerated micro powder; 180 parts of water and 5 parts of a water reducing agent.
The preparation method comprises the following steps:
(1) weighing the components according to the raw material ratio, adding the weighed cement, fly ash, recycled fine aggregate, recycled coarse aggregate and recycled micro powder, and stirring for 2 min;
(2) adding a water reducing agent and water into the product obtained in the step (1), and stirring for 3min to form a water-dispersion-resistant concrete mixture;
(3) respectively forming the mixture obtained in the step (2) into an underwater concrete test block and a land concrete test block according to the standard GB/T37990-2019, and maintaining for not less than 3 d; and curing to a specified age to form the finished concrete.
And (3) curing the concrete in the comparative example 1 and the examples 1-3 to a specified age to form finished concrete, testing the compressive strength of the underwater formed test blocks 7d and 28d and the compressive strength of the land formed test blocks 7d and 28d according to the test specified in GB/T37990-.
Results of Performance testing
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The water-dispersion-resistant concrete is characterized by comprising the following components in parts by weight: 300-600 parts of cement; 60-200 parts of fly ash; 600-800 parts of recycled fine aggregate; 800-1100 parts of recycled coarse aggregate; 100-200 parts of regenerated micro powder; 5-15 parts of a water reducing agent; 100-200 parts of metakaolin; 160-240 parts of modified nano silicon oxide dispersion liquid; 3-10 parts of organosilane; 1-5 parts of polyvinyl alcohol; 5-15 parts of polymethyl acrylate; 3-5 parts of triethanolamine; 1-3 parts of polyacrylamide; 1-5 parts of polyethylene glycol and 0-6 parts of synthetic fiber.
2. The water-resistant dispersion concrete according to claim 1, wherein the maximum particle size of the recycled coarse aggregate is 25mm continuous gradation, the mud content is less than or equal to 0.5%, and the apparent density is more than or equal to 2200kg/m3The water absorption rate is less than or equal to 8 percent.
3. The water-resistant dispersion concrete according to claim 1, wherein the content of mud blocks in the recycled fine aggregate is not more than 1.0%, and the apparent density is not less than 2200kg/m3The water absorption rate is less than or equal to 10 percent.
4. The water dispersion resistant concrete according to claim 1, wherein the organosilane is in a liquid state and has a hydrolyzable oxide content of 100ppm or less.
5. The water-dispersing resistant concrete according to claim 1, wherein the average molecular weight of said polyvinyl alcohol is 150000 or more.
6. The water-resistant dispersion concrete according to claim 1, wherein the polymethyl acrylate has an average molecular weight of 10000 to 30000.
7. The water-resistant dispersion concrete according to claim 1, wherein the modified nano-silica dispersion liquid has a solid content of 10 to 20%, an average particle diameter of 5 to 10nm, and a specific surface area of 300 to 1200m2/g。
8. The water-resistant dispersion concrete according to claim 1, wherein the molecular weight of the polyethylene glycol is 400 to 2000.
9. The water dispersion resistant concrete according to claim 1, wherein the synthetic fibers are one or more of polypropylene fibers, polyacrylonitrile fibers, polyvinyl alcohol fibers or carbon fibers, and the length of the synthetic fibers is 6-30 mm.
10. A method for preparing the water-dispersion-resistant concrete according to any one of claims 1 to 9, comprising the steps of:
(1) weighing the components according to the raw material ratio, and uniformly stirring the weighed cement, fly ash, recycled fine aggregate, recycled coarse aggregate, recycled micro powder, metakaolin and synthetic fiber;
(2) adding a water reducing agent, a modified nano silicon oxide dispersion liquid, organosilane and polyvinyl alcohol into the product obtained in the step (1), and uniformly stirring;
(3) adding polymethyl acrylate, triethanolamine, polyacrylamide and polyethylene glycol into the product obtained in the step (2), and uniformly stirring to obtain a water-dispersion-resistant concrete mixture;
(4) and (4) molding the anti-water dispersion concrete mixture obtained in the step (3) in an underwater environment, and curing at the underwater normal temperature.
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| CN114804740A (en) * | 2022-05-24 | 2022-07-29 | 郑州大学 | Preparation method of polymer concrete reinforced by hybrid fibers and nano materials |
| CN114890741A (en) * | 2022-05-11 | 2022-08-12 | 中建八局第二建设有限公司 | Low-carbon self-leveling lightweight concrete and preparation method and construction method thereof |
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| CN110723932A (en) * | 2019-11-04 | 2020-01-24 | 中铁建大桥工程局集团第四工程有限公司 | Underwater anti-dispersion concrete prepared from construction waste recycled aggregate |
| CN112723807A (en) * | 2021-02-08 | 2021-04-30 | 大连理工大学 | Seawater-mixed underwater undispersed concrete and preparation method thereof |
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| CN114890741A (en) * | 2022-05-11 | 2022-08-12 | 中建八局第二建设有限公司 | Low-carbon self-leveling lightweight concrete and preparation method and construction method thereof |
| CN114804740A (en) * | 2022-05-24 | 2022-07-29 | 郑州大学 | Preparation method of polymer concrete reinforced by hybrid fibers and nano materials |
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