CN113636779A - Self-curing high-expansion fiber anti-cracking agent and preparation method thereof - Google Patents
Self-curing high-expansion fiber anti-cracking agent and preparation method thereof Download PDFInfo
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- CN113636779A CN113636779A CN202110749740.5A CN202110749740A CN113636779A CN 113636779 A CN113636779 A CN 113636779A CN 202110749740 A CN202110749740 A CN 202110749740A CN 113636779 A CN113636779 A CN 113636779A
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- 239000000835 fiber Substances 0.000 title claims abstract description 127
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 93
- 238000005336 cracking Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 61
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000006703 hydration reaction Methods 0.000 claims abstract description 8
- 229920001661 Chitosan Polymers 0.000 claims description 40
- 239000000843 powder Substances 0.000 claims description 40
- 239000000243 solution Substances 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 37
- 239000002518 antifoaming agent Substances 0.000 claims description 33
- 239000002131 composite material Substances 0.000 claims description 25
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 20
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 18
- 239000000022 bacteriostatic agent Substances 0.000 claims description 18
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 235000019353 potassium silicate Nutrition 0.000 claims description 18
- 229910021487 silica fume Inorganic materials 0.000 claims description 18
- 239000000176 sodium gluconate Substances 0.000 claims description 18
- 229940005574 sodium gluconate Drugs 0.000 claims description 18
- 235000012207 sodium gluconate Nutrition 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 16
- 239000011550 stock solution Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 230000001651 autotrophic effect Effects 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 12
- 238000009987 spinning Methods 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 235000010755 mineral Nutrition 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 8
- 239000004111 Potassium silicate Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- BHGADZKHWXCHKX-UHFFFAOYSA-N methane;potassium Chemical compound C.[K] BHGADZKHWXCHKX-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011591 potassium Substances 0.000 claims description 8
- 229910052700 potassium Inorganic materials 0.000 claims description 8
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000002166 wet spinning Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 7
- 230000001112 coagulating effect Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 238000004078 waterproofing Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 36
- 230000036571 hydration Effects 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 18
- 239000004205 dimethyl polysiloxane Substances 0.000 description 14
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 14
- -1 polydimethylsiloxane Polymers 0.000 description 14
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 12
- 239000002253 acid Substances 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 239000005639 Lauric acid Substances 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- ZJDGKLAPAYNDQU-UHFFFAOYSA-J [Zr+4].[O-]P([O-])=O.[O-]P([O-])=O Chemical compound [Zr+4].[O-]P([O-])=O.[O-]P([O-])=O ZJDGKLAPAYNDQU-UHFFFAOYSA-J 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004067 bulking agent Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/50—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyalcohols, polyacetals or polyketals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Artificial Filaments (AREA)
Abstract
The invention belongs to the field of building material concrete additives, and particularly relates to a self-curing high-expansion fiber anti-cracking agent and a preparation method thereof. The invention adopts the modified polyvinyl alcohol fiber to improve the water absorption rate of the fiber and increase the ultimate tensile strength of the fiber, and the water absorbed by the fiber at the early stage is gradually released by negative pressure under the condition that the internal water concentration is reduced in the concrete hardening process, so as to solve the problem of insufficient water consumption for hydration of the expanding agent, further promote the reaction of the expanding agent, improve the expansion rate, increase the expansion energy and effectively inhibit the concrete from cracking.
Description
Technical Field
The invention belongs to the field of building material concrete admixtures, and particularly relates to a self-curing high-expansion fiber crack resistance agent and a preparation method thereof.
Background
Concrete cracking has become a common problem in building engineering, once the concrete has macro cracks, the overall appearance of the structure is affected, the permeation resistance of the concrete is greatly reduced, a channel is provided for the diffusion of harmful components such as carbon dioxide, chloride ions, sulfate and the like into the concrete, the corrosion, carbonization and sulfate erosion of reinforcing steel bars are accelerated, and the durability and service life of buildings are seriously affected.
Recent concrete researchers inspired ancient houses to construct strong-toughness soil-block walls made of straw, hair or hemp ropes. The method is characterized in that the fiber is mixed with the concrete, the average distance between fibers in the concrete influences the distribution of tensile stress, the anti-cracking effect of the fiber concrete is further determined, the dispersion of the fibers in the concrete is random and cannot be controlled manually, so that the control of the crack difference by utilizing the distance between the fibers is strong, the length-diameter ratio of the fibers, the bonding force between the fibers and a concrete matrix and other multidirectional factors are the key of internal anti-cracking, and fiber manufacturers can carry out oil immersion treatment on the surfaces of the fibers at present, so that the bonding between the fibers and the concrete has defects; finally, the elastic modulus and the strength of the fiber and the matching degree of the strength of each stage of the concrete all determine important factors of the fiber for enhancing and toughening the concrete, so that in order to improve the application effect of the fiber in practical engineering and make up for the defects caused by single fiber doping, the modification of the fiber, the improvement of the bonding strength of the fiber and a concrete matrix, the improvement of the autogenous elastic modulus and the tensile strength of the fiber and the like are important measures.
The expanding agent can resist the shrinkage deformation of concrete under the limiting condition, and the volume expansion generated by hydration of the expanding agent is mainly used for compensating the shrinkage of the concrete, so that the cracking risk of the concrete can be effectively reduced. The early hydration and the later expansion rate of the expanding agent both require a large amount of water, especially in low-cement-ratio high-strength concrete, the application limit is larger, and the water concentration in the concrete is lower and lower along with the age of the concrete, so that the hydration process of the expanding agent is severely restricted, and the purpose of compensating shrinkage cannot be achieved.
Therefore, the method is an effective technical approach for increasing the bonding strength of the fibers and the concrete matrix by improving the water absorption rate of the fibers and simultaneously providing the moisture required by the hydration of the expanding agent.
Disclosure of Invention
The invention aims to provide an autotrophic high-expansion fiber anti-cracking agent, which adopts modified polyvinyl alcohol fibers to improve the water absorption of the fibers and increase the ultimate tensile strength of the fibers.
The invention also aims to provide a self-curing high-expansion fiber anti-cracking agent and a preparation method thereof, and the preparation process is simple and convenient and is easy to adjust.
The scheme adopted by the invention for realizing one of the purposes is as follows: the self-curing high-expansion fiber anti-cracking agent comprises, by weight, 0.1-4% of modified polyvinyl alcohol fibers, 40-59.9% of multi-source composite expansion agent, 8-15% of silica fume, 20-35% of siliceous waterproofing agent, 5-8% of defoaming agent, 5-8% of water reducing agent and 2-5% of sodium gluconate, wherein the total amount of the raw materials is 100%.
Preferably, the raw material components of the modified polyvinyl alcohol fiber comprise 20 wt% -35 wt% of chitosan powder, 40 wt% -60 wt% of polyvinyl alcohol fiber powder, 4 wt% -10 wt% of silane coupling agent, 3 wt% -6 wt% of defoaming agent, 3 wt% -6 wt% of stabilizing agent and 3 wt% -6 wt% of bacteriostatic agent.
According to the invention, the chitosan is used for modifying the polyvinyl alcohol fiber, the water absorption rate of the fiber is improved, the ultimate tensile strength of the fiber is increased, then the surface of the fiber is subjected to sizing treatment by using a mixed solution of a silane coupling agent and a bacteriostatic agent, the hydrophilic group in the silane coupling agent can increase the interface bonding force between the fiber and concrete, and meanwhile, the chitosan is an organic matter and needs to be added with the bacteriostatic agent to prevent mildew growth of the fiber.
Preferably, the components of the multisource composite expanding agent comprise at least three of 20-30 wt% of calcium sulphoaluminate, 20-30 wt% of calcium oxide, 40-60 wt% of magnesium oxide and 3-8 wt% of iron powder.
Preferably, the net content of the magnesium oxide is more than or equal to 85 percent, and the specific surface area is more than or equal to 350m2Per kg, hydration reaction time of magnesium oxide 100T is more than or equal to s and less than 200 s; the iron powder passes through a sieve with the aperture of 0.15mm, and the screen residue is less than 5 percent.
Preferably, the siliceous waterproofing agent comprises 45-65 wt% of silicate cement, 15-35 wt% of superfine mineral powder, 5-10 wt% of methyl potassium silicate, 4-8 wt% of potassium fluosilicate and 8-15 wt% of water glass.
Preferably, the modulus of the water glass is 2.0-3.0, and the specific surface area of the superfine mineral powder is more than or equal to 500m2/kg。
The second scheme adopted by the invention for achieving the purpose is as follows: the preparation method of the self-curing high-expansion fiber crack resistance agent comprises the following steps: uniformly mixing a multisource composite expanding agent, silica fume, a siliceous waterproof agent, an antifoaming agent, sodium gluconate and a water reducing agent, blowing modified polyvinyl alcohol fibers into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber crack resistance agent.
Preferably, the preparation method of the modified polyvinyl alcohol fiber comprises the following steps:
(1) preparing a chitosan solution with the concentration of 6-8 wt% at the temperature of 40-55 ℃;
(2) preparing 30-50% of polyvinyl alcohol fiber powder slurry by mass percent;
(3) mixing according to the ratio of m (polyvinyl alcohol slurry) to m (chitosan solution) of 1:1, uniformly mixing, and then sequentially adding a defoaming agent and a stabilizing agent to prepare a blending stock solution;
(4) filtering the blending stock solution, then carrying out wet spinning, washing by an organic alcohol solution, after spinning, oiling by a mixed solution pool of a silane coupling agent and a bacteriostatic agent, and finally drying to prepare the modified polyvinyl alcohol fiber blended by chitosan and polyvinyl alcohol.
Preferably, the coagulation bath used for spinning is a 6% to 8% strength NaOH or KOH solution.
The invention has the following advantages and beneficial effects:
according to the self-curing high-expansion fiber anti-cracking agent, the modified polyvinyl alcohol fiber is adopted, so that the water absorption rate of the fiber is improved, the ultimate tensile strength of the fiber is increased, the water absorbed in the early stage of the fiber is gradually released through negative pressure under the condition that the internal water concentration is reduced in the hardening process of concrete, the problem that the hydration water consumption of the expansion agent is insufficient is solved, the reaction of the expansion agent is further promoted, the expansion rate is improved, the expansion energy is increased, and the cracking of the concrete is effectively inhibited; the added waterproof component can also effectively repair micro cracks in the concrete, play a role in compacting and improve the waterproof performance of the concrete.
The preparation method has simple preparation process, is easy to adjust and is convenient for industrial application.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
Example 1
The self-curing high-expansion fiber anti-cracking agent is characterized by comprising, by weight, 0.2% of modified fibers, 46.8% of multi-source composite expansion agent, 15% of silica fume, 25% of silicon waterproof agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 3% of sodium gluconate.
The modified fiber component comprises 30 wt% of chitosan powder, 50 wt% of polyvinyl alcohol fiber powder, 6 wt% of silane coupling agent, 4 wt% of polydimethylsiloxane defoaming agent, 5 wt% of lauric acid and 5 wt% of silver-loaded organic zirconium phosphonate.
The multisource composite expanding agent comprises 20 wt% of calcium sulphoaluminate, 20 wt% of calcium oxide, 52 wt% of magnesium oxide and 8 wt% of iron powder.
The siliceous waterproof agent comprises 52 wt% of silicic acid cement, 30 wt% of superfine mineral powder, 5 wt% of methyl potassium silicate, 4 wt% of potassium fluosilicate and 9 wt% of water glass.
The preparation method of the modified fiber comprises the following steps: (1) dissolving appropriate amount of chitosan powder with 4% acetic acid solution at 40 deg.C water bath condition to obtain 6% chitosan solution, and magnetically stirring for 1 hr; meanwhile, preparing a proper amount of PVA (polyvinyl alcohol) powder into 30% PVA slurry; and finally, mixing m (PVA slurry) and m (chitosan solution) in a ratio of 1:1, stirring for 0.5h, and sequentially adding a proper amount of defoaming agent and liquid stabilizer to prepare a blending stock solution. (2) Filtering the blending stock solution, then carrying out wet spinning, wherein a coagulating bath is 8% NaOH solution, washing for 3 times by using propanol solution, oiling by using a mixing solution pool of silane coupling agent and bacteriostatic agent (the mass ratio of the silane coupling agent to the bacteriostatic agent is 10:1) after spinning, and finally drying in a drying oven to obtain the chitosan modified PVA fiber.
And finally, uniformly mixing the multisource composite expanding agent, the silica fume, the siliceous waterproof agent, the defoaming agent, the sodium gluconate and the water reducing agent, blowing the modified polyvinyl alcohol fiber into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber anti-cracking agent.
Example 2
The self-curing high-expansion fiber anti-cracking agent is characterized by comprising 2% of modified fibers, 45% of multi-source composite expansion agent, 15% of silica fume, 25% of silicon waterproof agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 3% of sodium gluconate.
The modified fiber component comprises 30 wt% of chitosan powder, 50 wt% of polyvinyl alcohol fiber powder, 6 wt% of silane coupling agent, 4 wt% of polydimethylsiloxane defoaming agent, 5 wt% of lauric acid and 5 wt% of silver-loaded organic zirconium phosphonate.
The multisource composite expanding agent comprises 20 wt% of calcium sulphoaluminate, 20 wt% of calcium oxide, 52 wt% of magnesium oxide and 8 wt% of iron powder.
The siliceous waterproof agent comprises 52 wt% of silicic acid cement, 30 wt% of superfine mineral powder, 5 wt% of methyl potassium silicate, 4 wt% of potassium fluosilicate and 9 wt% of water glass.
The preparation method of the modified fiber comprises the following steps: (1) dissolving appropriate amount of chitosan powder with 4% acetic acid solution at 40 deg.C water bath condition to obtain 6% chitosan solution, and magnetically stirring for 1 hr; meanwhile, preparing a proper amount of PVA powder into 30% PVA slurry; and finally, mixing m (PVA slurry) and m (chitosan solution) in a ratio of 1:1, stirring for 0.5h, and sequentially adding a proper amount of defoaming agent and liquid stabilizer to prepare a blending stock solution. (2) Filtering the blending stock solution, then carrying out wet spinning, wherein a coagulating bath is 8% NaOH solution, washing for 3 times by using propanol solution, oiling by using a mixing solution pool of silane coupling agent and bacteriostatic agent (the mass ratio of the silane coupling agent to the bacteriostatic agent is 10:1) after spinning, and finally drying in a drying oven to obtain the chitosan modified PVA fiber.
And finally, uniformly mixing the multisource composite expanding agent, the silica fume, the siliceous waterproof agent, the defoaming agent, the sodium gluconate and the water reducing agent, blowing the modified polyvinyl alcohol fiber into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber anti-cracking agent.
Example 3
The self-curing high-expansion fiber anti-cracking agent is characterized by comprising 4% of modified fibers, 43% of multi-source composite expansion agent, 15% of silica fume, 25% of silicon waterproof agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 3% of sodium gluconate.
The modified fiber component comprises 30 wt% of chitosan powder, 50 wt% of polyvinyl alcohol fiber powder, 6 wt% of silane coupling agent, 4 wt% of polydimethylsiloxane defoaming agent, 5 wt% of lauric acid and 5 wt% of silver-loaded organic zirconium phosphonate.
The multisource composite expanding agent comprises 20 wt% of calcium sulphoaluminate, 20 wt% of calcium oxide, 52 wt% of magnesium oxide and 8 wt% of iron powder.
The siliceous waterproof agent comprises 52 wt% of silicic acid cement, 30 wt% of superfine mineral powder, 5 wt% of methyl potassium silicate, 4 wt% of potassium fluosilicate and 9 wt% of water glass.
The preparation method of the modified fiber comprises the following steps: (1) dissolving appropriate amount of chitosan powder with 4% acetic acid solution at 40 deg.C water bath condition to obtain 6% chitosan solution, and magnetically stirring for 1 hr; meanwhile, preparing a proper amount of PVA powder into 30% PVA slurry; and finally, mixing m (PVA slurry) and m (chitosan solution) in a ratio of 1:1, stirring for 0.5h, and sequentially adding a proper amount of defoaming agent and liquid stabilizer to prepare a blending stock solution. (2) Filtering the blending stock solution, then carrying out wet spinning, wherein a coagulating bath is 8% NaOH solution, washing for 3 times by using propanol solution, oiling by using a mixing solution pool of silane coupling agent and bacteriostatic agent (the mass ratio of the silane coupling agent to the bacteriostatic agent is 10:1) after spinning, and finally drying in a drying oven to obtain the chitosan modified PVA fiber.
And finally, uniformly mixing the multisource composite expanding agent, the silica fume, the siliceous waterproof agent, the defoaming agent, the sodium gluconate and the water reducing agent, blowing the modified polyvinyl alcohol fiber into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber anti-cracking agent.
Example 1, example 2 and example 3 are only for the difference between the modified fiber and the amount of bulking agent incorporated.
Example 4
The self-curing high-expansion fiber anti-cracking agent is characterized by comprising, by weight, 0.1% of modified fibers, 59.9% of multi-source composite expansion agent, 8% of silica fume, 20% of siliceous waterproofing agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 2% of sodium gluconate.
The modified fiber component comprises 20 wt% of chitosan powder, 60 wt% of polyvinyl alcohol fiber powder, 10 wt% of silane coupling agent, 4 wt% of polydimethylsiloxane defoaming agent, 3 wt% of lauric acid and 3 wt% of silver-loaded organic zirconium phosphonate.
The multisource composite expanding agent comprises 30 wt% of calcium sulphoaluminate, 30 wt% of calcium oxide and 60 wt% of magnesium oxide.
The siliceous waterproofing agent comprises 45 wt% of silicate cement, 22 wt% of superfine mineral powder, 10 wt% of methyl potassium silicate, 8 wt% of potassium fluosilicate and 15 wt% of water glass.
The preparation method of the modified fiber comprises the following steps: (1) dissolving appropriate amount of chitosan powder with 4% acetic acid solution at 50 deg.C water bath condition to obtain 8% chitosan solution, and magnetically stirring for 1 hr; meanwhile, preparing a proper amount of PVA powder into 50% PVA slurry; and finally, mixing m (PVA slurry) and m (chitosan solution) in a ratio of 1:1, stirring for 0.5h, and sequentially adding a proper amount of defoaming agent and liquid stabilizer to prepare a blending stock solution. (2) Filtering the blending stock solution, then carrying out wet spinning, wherein a coagulating bath is 8% NaOH solution, washing for 3 times by using ethanol, after spinning, oiling the spinning solution by using a mixed solution pool of a silane coupling agent and a bacteriostatic agent (the mass ratio of the silane coupling agent to the bacteriostatic agent is 10:1), and finally drying the spinning solution in a drying box to obtain the chitosan modified PVA fiber.
And finally, uniformly mixing the multisource composite expanding agent, the silica fume, the siliceous waterproof agent, the defoaming agent, the sodium gluconate and the water reducing agent, blowing the modified polyvinyl alcohol fiber into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber anti-cracking agent.
Example 5
The self-curing high-expansion fiber anti-cracking agent is characterized by comprising 2% of modified fibers, 40% of multi-source composite expansion agent, 8% of silica fume, 35% of silicon waterproof agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 5% of sodium gluconate.
The modified fiber component comprises 35 wt% of chitosan powder, 43 wt% of polyvinyl alcohol fiber powder, 4 wt% of silane coupling agent, 6 wt% of polydimethylsiloxane defoamer, 6 wt% of lauric acid and 6 wt% of silver-loaded organic zirconium phosphonate.
The multisource composite expanding agent comprises 20 wt% of calcium sulphoaluminate, 20 wt% of calcium oxide and 60 wt% of magnesium oxide.
The siliceous waterproof agent comprises 45 wt% of silicic acid cement, 35 wt% of superfine mineral powder, 5 wt% of methyl potassium silicate, 5 wt% of potassium fluosilicate and 10 wt% of water glass.
The preparation method of the modified fiber comprises the following steps: (1) dissolving appropriate amount of chitosan powder with 4% acetic acid solution at 55 deg.C in water bath to obtain 7% chitosan solution, and magnetically stirring for 1 hr; meanwhile, preparing a proper amount of PVA powder into 40% PVA slurry; and finally, mixing m (PVA slurry) and m (chitosan solution) in a ratio of 1:1, stirring for 0.5h, and sequentially adding a proper amount of defoaming agent and liquid stabilizer to prepare a blending stock solution. (2) Filtering the blending stock solution, then carrying out wet spinning, wherein a coagulating bath is 8% NaOH solution, washing for 3 times by methanol, spinning, oiling by a mixed solution pool of a silane coupling agent and a bacteriostatic agent (the mass ratio of the silane coupling agent to the bacteriostatic agent is 10:1), and finally drying in a drying oven to obtain the chitosan modified PVA fiber.
And finally, uniformly mixing the multisource composite expanding agent, the silica fume, the siliceous waterproof agent, the defoaming agent, the sodium gluconate and the water reducing agent, blowing the modified polyvinyl alcohol fiber into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber anti-cracking agent.
Example 6
The self-curing high-expansion fiber anti-cracking agent is characterized by comprising 4% of modified fibers, 46% of multi-source composite expansion agent, 10% of silica fume, 20% of silicon waterproof agent, 8% of polydimethylsiloxane defoaming agent, 8% of polycarboxylic acid water reducing agent and 4% of sodium gluconate.
The modified fiber component comprises 35 wt% of chitosan powder, 40 wt% of polyvinyl alcohol fiber powder, 10 wt% of silane coupling agent, 3 wt% of polydimethylsiloxane defoaming agent, 6 wt% of lauric acid and 6 wt% of silver-loaded organic zirconium phosphonate.
The multisource composite expanding agent comprises 25 wt% of calcium sulphoaluminate, 25 wt% of calcium oxide, 47 wt% of magnesium oxide and 3 wt% of iron powder.
The siliceous waterproof agent comprises 65 wt% of silicic acid cement, 15 wt% of superfine mineral powder, 8 wt% of methyl potassium silicate, 4 wt% of potassium fluosilicate and 8 wt% of water glass.
The preparation method of the modified fiber comprises the following steps: (1) dissolving appropriate amount of chitosan powder with 4% acetic acid solution at 40 deg.C water bath condition to obtain 6% chitosan solution, and magnetically stirring for 1 hr; meanwhile, preparing a proper amount of PVA powder into 30% PVA slurry; and finally, mixing m (PVA slurry) and m (chitosan solution) in a ratio of 1:1, stirring for 0.5h, and sequentially adding a proper amount of defoaming agent and liquid stabilizer to prepare a blending stock solution. (2) Filtering the blending stock solution, then carrying out wet spinning, wherein a coagulating bath is 8% NaOH solution, washing for 3 times by propanol, oiling by a mixed solution pool of a silane coupling agent and a bacteriostatic agent (the mass ratio of the silane coupling agent to the bacteriostatic agent is 10:1) after spinning, and finally drying in a drying oven to obtain the chitosan modified PVA fiber.
And finally, uniformly mixing the multisource composite expanding agent, the silica fume, the siliceous waterproof agent, the defoaming agent, the sodium gluconate and the water reducing agent, blowing the modified polyvinyl alcohol fiber into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber anti-cracking agent.
Comparative example 1
The difference between the comparative example and the example 1 is that the product does not contain fiber components, and the corresponding fiber components are replaced by expanding agents, namely the raw materials comprise 47% of multi-source composite expanding agent, 15% of silica fume, 25% of silicon waterproof agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 3% of sodium gluconate;
comparative example 2
The difference between the comparative example and the example 1 is that only unmodified polyvinyl alcohol fiber is added in the product, namely, the raw materials comprise 2% of unmodified polyvinyl alcohol fiber, 45% of multisource composite expanding agent, 15% of silica fume, 25% of silicon waterproof agent, 5% of polydimethylsiloxane defoaming agent, 5% of polycarboxylic acid water reducing agent and 3% of sodium gluconate;
the performance indexes of the self-curing type high expansion fiber crack inhibitors prepared in examples 1 to 3 and comparative examples 1 to 2 and the preparation methods thereof are shown in tables 1 to 3.
TABLE 1 indexes of compression and rupture resistance and limiting expansion ratio
TABLE 2 concrete penetration height
TABLE 3 Total area of cracking per unit area of concrete (Flat method)
From the data in table 1, it can be seen that: the autotrophic high-expansion fiber crack resistance agent prepared in the embodiments 1-3 can effectively improve the mechanical property of the cement-based material, and simultaneously improve the expansion rate of the expansion agent.
From the data in table 2, it can be seen that: the autotrophic high-expansion fiber crack resistance agents prepared in examples 1 to 3 can increase the impermeability of concrete and reduce the penetration depth of water into concrete, thereby improving the durability of concrete.
From the data in table 3, it can be seen that: the autotrophic high-expansion fiber anti-cracking agent prepared in the embodiments 1 to 3 effectively improves the anti-cracking capability of concrete and reduces the risk of cracking of concrete.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (9)
1. A self-curing high-expansion fiber anti-cracking agent is characterized in that: the raw materials comprise, by weight, 0.1-4% of modified polyvinyl alcohol fibers, 40-59.9% of multi-source compound expanding agent, 8-15% of silica fume, 20-35% of siliceous waterproofing agent, 5-8% of defoaming agent, 5-8% of water reducing agent and 2-5% of sodium gluconate, and the sum of the raw materials is 100%.
2. The self-curing high-expansion fiber crack inhibitor according to claim 1, wherein: the raw material components of the modified polyvinyl alcohol fiber comprise 20-35 wt% of chitosan powder, 40-60 wt% of polyvinyl alcohol fiber powder, 4-10 wt% of silane coupling agent, 3-6 wt% of defoaming agent, 3-6 wt% of stabilizing agent and 3-6 wt% of bacteriostatic agent.
3. The self-curing high-expansion fiber crack inhibitor according to claim 1, wherein: the multi-source composite expanding agent comprises at least three of 20-30 wt% of calcium sulphoaluminate, 20-30 wt% of calcium oxide, 40-60 wt% of magnesium oxide and 3-8 wt% of iron powder.
4. The self-curing high-expansion fiber crack inhibitor according to claim 3, wherein: the net content of magnesium oxide is more than or equal to 85 percent, and the specific surface area is more than or equal to 350m2The hydration reaction time of the magnesium oxide is more than or equal to 100s and t is less than 200 s; the iron powder passes through a sieve with the aperture of 0.15mm, and the screen residue is less than 5 percent.
5. The self-curing high-expansion fiber crack inhibitor according to claim 1, wherein: the siliceous waterproofing agent comprises 45-65 wt% of silicic acid cement, 15-35 wt% of superfine mineral powder, 5-10 wt% of methyl potassium silicate, 4-8 wt% of potassium fluosilicate and 8-15 wt% of water glass.
6. The self-curing high-expansion fiber crack inhibitor according to claim 5, wherein: the modulus of the water glass is 2.0-3.0, and the specific surface area of the superfine mineral powder is more than or equal to 500m2/kg。
7. The preparation method of the self-curing high-expansion fiber crack resistance agent as claimed in any one of claims 1 to 6, which comprises the following steps: uniformly mixing a multisource composite expanding agent, silica fume, a siliceous waterproof agent, an antifoaming agent, sodium gluconate and a water reducing agent, blowing modified polyvinyl alcohol fibers into the mixture, and continuously stirring uniformly to obtain the autotrophic high-expansion fiber crack resistance agent.
8. The method for preparing the self-curing high-expansion fiber crack resistance agent according to claim 7, wherein the method comprises the following steps: the preparation method of the modified polyvinyl alcohol fiber comprises the following steps:
(1) preparing a chitosan solution with the concentration of 6-8 wt% at the temperature of 40-55 ℃;
(2) preparing 30-50% of polyvinyl alcohol fiber powder slurry by mass percent;
(3) mixing according to the ratio of m (polyvinyl alcohol slurry) to m (chitosan solution) of 1:1, uniformly mixing, and then sequentially adding a defoaming agent and a stabilizing agent to prepare a blending stock solution;
(4) filtering the blending stock solution, then carrying out wet spinning, washing by an organic alcohol solution, after spinning, oiling by a mixed solution pool of a silane coupling agent and a bacteriostatic agent, and finally drying to prepare the modified polyvinyl alcohol fiber blended by chitosan and polyvinyl alcohol.
9. The method for preparing the self-curing high-expansion fiber crack resistance agent according to claim 8, wherein the method comprises the following steps: the coagulating bath adopted by spinning is 6-8% NaOH or KOH solution.
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| CN115043625A (en) * | 2022-06-23 | 2022-09-13 | 潍坊纵横建材有限公司 | Porous high-expansion ceramic sand anti-cracking agent for concrete and preparation method thereof |
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Application publication date: 20211112 |