CN116813280B - Corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete and preparation method thereof - Google Patents
Corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete and preparation method thereof Download PDFInfo
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- CN116813280B CN116813280B CN202310831959.9A CN202310831959A CN116813280B CN 116813280 B CN116813280 B CN 116813280B CN 202310831959 A CN202310831959 A CN 202310831959A CN 116813280 B CN116813280 B CN 116813280B
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 71
- 230000007797 corrosion Effects 0.000 title claims abstract description 41
- 238000005260 corrosion Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 229920006282 Phenolic fiber Polymers 0.000 claims abstract description 58
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 22
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 14
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 13
- 235000009566 rice Nutrition 0.000 claims abstract description 13
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 12
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000011398 Portland cement Substances 0.000 claims abstract description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 16
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 claims description 16
- 229940006186 sodium polystyrene sulfonate Drugs 0.000 claims description 16
- FENFUOGYJVOCRY-UHFFFAOYSA-N 1-propoxypropan-2-ol Chemical compound CCCOCC(C)O FENFUOGYJVOCRY-UHFFFAOYSA-N 0.000 claims description 15
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 15
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 15
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 15
- 241000209094 Oryza Species 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 8
- 229920000459 Nitrile rubber Polymers 0.000 claims description 6
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 239000003469 silicate cement Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 238000002074 melt spinning Methods 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 238000009736 wetting Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 239000011863 silicon-based powder Substances 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 48
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 6
- 240000007594 Oryza sativa Species 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 17
- 230000035699 permeability Effects 0.000 description 13
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 9
- 239000013078 crystal Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229910001653 ettringite Inorganic materials 0.000 description 8
- 230000002829 reductive effect Effects 0.000 description 8
- 239000011148 porous material Substances 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000011378 shotcrete Substances 0.000 description 3
- 229910021487 silica fume Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000007676 flexural strength test Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application belongs to the technical field of concrete, and particularly discloses a corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete and a preparation method thereof; the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises 190-240 parts of Portland cement, 700-740 parts of machine-made sand, 520-580 parts of natural coarse aggregate, 450-500 parts of recycled aggregate, 8-12 parts of silica powder, 7-10 parts of rice hull ash, 5-8 parts of modified phenolic fibers, 3.9-6.7 parts of water reducer and 200-250 parts of water, wherein the modified phenolic fibers are prepared by mixing phenolic fibers with polydimethylsiloxane and epoxypropyl methyl ether, heating, drying and the like; the preparation method of the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises the step of uniformly mixing all the raw materials to obtain the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete. The application has the effect of improving the fracture resistance of the recycled aggregate permeable concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete and a preparation method thereof.
Background
At present, a large number of buildings or structures are dismantled every year in China, wherein most of the buildings and structures are built by taking concrete as main materials, and a large amount of waste concrete is generated along with the dismantling of the buildings and structures. In order to reduce the exploitation of concrete natural aggregate and protect the environment, recycled aggregate prepared from waste concrete is often used for replacing natural aggregate in the concrete engineering nowadays.
The recycled aggregate permeable concrete takes cement as cementing material, the substitution rate of the recycled aggregate is more than 30%, and the recycled aggregate permeable concrete is a concrete with a porous structure which is air permeable and water permeable and consists of a series of communicated pores and a concrete entity part framework. Because the surface and the inside of the recycled aggregate have more microcracks, the recycled aggregate is easier to crush compared with the natural aggregate, and the mechanical property of the recycled aggregate is lower, thereby influencing the mechanical property of the recycled aggregate permeable concrete. In addition, loose porous hardened cement mortar is attached to the surface of the recycled aggregate, and the hardened cement mortar can influence the interface transition area of cement and the recycled aggregate and the bonding performance of the interface transition area, so that the mechanical properties of the recycled aggregate permeable concrete are further influenced.
In view of the above-mentioned related art, the inventors believe that natural defects of recycled aggregate such as the presence of microcracks, the adhesion of hardened cement mortar, and the like affect the mechanical properties of recycled aggregate pervious concrete, and therefore, recycled aggregate pervious concrete still has room for improvement.
Disclosure of Invention
In order to improve the mechanical properties, particularly the fracture resistance, of the recycled aggregate pervious concrete, the application provides the corrosion-resistant and high fracture-resistant recycled aggregate pervious concrete and a preparation method thereof. According to the application, the reinforcing effect of the modified phenolic fiber on the toughness and strength of the recycled aggregate concrete is assisted by the filling effect of the silica powder and the rice hull ash on the cracks of the recycled aggregate, so that the fracture resistance of the recycled aggregate pervious concrete is improved.
The application provides a corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete which adopts the following technical scheme:
The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises the following components in parts by weight: 190-240 parts of Portland cement, 700-740 parts of machine-made sand, 520-580 parts of natural coarse aggregate, 450-500 parts of recycled aggregate, 8-12 parts of silica powder, 7-10 parts of rice hull ash, 5-8 parts of modified phenolic fibers, 3.9-6.7 parts of water reducer and 200-250 parts of water, wherein the preparation method of the modified phenolic fibers comprises the following steps:
(1) Phenolic resin, nitrile rubber and polypropylene (1-2): (0.5-0.7): (0.1-0.3) and evenly mixing by melting, extruding and granulating to obtain the modified phenolic resin;
(2) Carrying out melt spinning on the modified phenolic resin to prepare prefabricated modified phenolic fibers;
(3) And uniformly mixing the prefabricated modified phenolic fiber with polydimethylsiloxane, epoxypropyl methyl ether, heating, stirring, filtering and drying to obtain the modified phenolic fiber.
According to the technical scheme, phenolic fibers can be added into concrete to enhance the strength and toughness of the concrete, the phenolic resin, the nitrile rubber and the polypropylene are mixed to prepare the modified phenolic resin, the prefabricated modified phenolic fibers prepared from the modified phenolic resin have good toughness, the prefabricated modified phenolic fibers are subjected to further treatment of polydimethylsiloxane and epoxypropyl methyl ether to obtain the modified phenolic fibers with good hydrophobicity, the binding power of the modified phenolic fibers and the cementing material is further enhanced, the modified phenolic fibers and the cementing material can be better bridged in the recycled aggregate pervious concrete, the generation of cracks of the recycled aggregate pervious concrete is reduced, and the quality of the recycled aggregate pervious concrete is improved.
The silica powder and the rice hull ash can be matched with the modified phenolic fiber to further improve the mechanical property of the recycled aggregate pervious concrete, and further analyze that the silica powder and the rice hull ash can well fill gaps of the recycled aggregate and further enhance the binding force between the recycled aggregate and other raw materials in the recycled aggregate pervious concrete after full hydration.
Preferably, the mass ratio of the prefabricated modified phenolic fiber to the polydimethylsiloxane to the epoxypropyl methyl ether is (1-2): (3-5): (2-3).
According to the technical scheme, the prefabricated modified phenolic fiber is modified according to the mass ratio, so that the hydrophobicity of the modified phenolic fiber can be further improved, and the binding capacity of the modified phenolic fiber and the cementing material can be further enhanced.
Preferably, the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete further comprises 10-15 parts of an admixture, wherein the admixture comprises 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether.
Because the recycled aggregate pervious concrete has good water permeability, various harmful substances such as sulfate easily enter the recycled aggregate pervious concrete along with moisture, so that the inside of the concrete is damaged, and the durability of the recycled aggregate pervious concrete is reduced. According to the application, the admixture prepared from 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether is doped into the recycled aggregate permeable concrete, so that on one hand, the alkalinity of the recycled aggregate permeable concrete can be reduced, the formed ettringite is promoted to be in a lath shape crystal, the formation of needle-shaped or sheet-shaped crystal ettringite is avoided, so that larger crystal stress is generated to cause cracking of the concrete, and on the other hand, the transformation of the ettringite crystal can be slowed down, the effect of inhibiting swelling cracking of the recycled aggregate permeable concrete caused by the increase of the solid phase volume of the ettringite is achieved, and therefore, the corrosion of sulfate on the recycled aggregate permeable concrete is slowed down, and the problem of durability reduction of the recycled aggregate permeable concrete caused by the corrosion of sulfate is reduced.
Preferably, the preparation method of the admixture comprises the following steps: and uniformly mixing 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether at normal temperature to obtain the admixture.
In the technical scheme, the preparation method of the admixture is simple and convenient, and is more beneficial to industrial production.
Preferably, the blend comprises 20-30 parts by weight of 1-propane sulfonic acid, 10-20 parts by weight of sodium polystyrene sulfonate, 5-10 parts by weight of polyvinylpyrrolidone and 70-90 parts by weight of propylene glycol propyl ether.
According to the technical scheme, the admixture prepared according to the proportion has a better improvement effect on the recycled aggregate pervious concrete, the alkalinity of the recycled aggregate pervious concrete can be further reduced, the corrosion of sulfate on the recycled aggregate pervious concrete is further slowed down, and the durability of the recycled aggregate pervious concrete is further improved.
Preferably, the recycled aggregate is a continuous recycled aggregate with a particle size of 4-13 mm. The continuous-grade recycled aggregate with the diameter of 4-13 mm is selected to meet the requirement of good porosity of the recycled aggregate pervious concrete, so that the recycled aggregate pervious concrete is ensured to have good water permeability.
Preferably, the natural coarse aggregate is continuous-grade crushed stone with the particle size of 4-13 mm. The continuous broken stone with the grain diameter of 4-13 mm is selected as the natural coarse aggregate, so that the continuous broken stone can be better matched with the recycled aggregate, the uniformity of the recycled aggregate permeable concrete pores is ensured, the condition that the cement material flows into the pores due to the self fluidity and blocks the pores is further avoided, and the recycled aggregate permeable concrete is ensured to have good water permeability.
Preferably, the fineness modulus of the machine-made sand is 2.5-3.0. The machine-made sand with the fineness modulus of 2.5-3.0 can be better matched with other raw materials in the recycled aggregate pervious concrete, so that the gap in the recycled aggregate pervious concrete skeleton is filled, the compactness of the recycled aggregate pervious concrete skeleton is further improved, and the fracture resistance of the recycled aggregate pervious concrete is further improved.
Preferably, the water reducing agent is a polycarboxylate water reducing agent. The polycarboxylate water reducer has good water reducing effect, can prevent water from being excessively absorbed by the recycled aggregate, and can further improve the working performance of the recycled aggregate permeable concrete.
In a second aspect, the application provides a preparation method of corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete, which adopts the following technical scheme:
A preparation method of corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises the following steps:
step one: pre-wetting recycled aggregate, firstly mixing natural coarse aggregate, recycled aggregate and 1/3-1/2 of water in the formula, and stirring for 1-2 min;
Step two: adding silicate cement, machine-made sand, silica powder, rice hull ash, modified phenolic fiber, a water reducing agent and an admixture, mixing, and stirring for 1-2 min;
Step three: adding the rest water in the formula, and stirring for 1-2 min to obtain the corrosion-resistant high-fracture-resistant recycled aggregate pervious concrete.
According to the technical scheme, the recycled aggregate and the natural coarse aggregate are wetted in advance, so that the situation that the cementing material cannot be fully and uniformly mixed with water is avoided, the raw materials in the recycled aggregate permeable concrete are fully mixed, and the recycled aggregate permeable concrete fully cooperates to play a role. The preparation method is simple and efficient, and is convenient for industrial production.
In summary, the present application includes at least one of the following beneficial technical effects:
1. According to the application, phenolic fibers can be added into concrete to enhance the strength and toughness of the concrete, and the modified phenolic resin is prepared by mixing phenolic resin, nitrile rubber and polypropylene, so that the prepared prefabricated modified phenolic fibers have good toughness, and the prefabricated modified phenolic fibers are subjected to further treatment of polydimethylsiloxane and epoxypropyl methyl ether to obtain the modified phenolic fibers with good hydrophobicity, so that the binding power of the modified phenolic fibers and cementing materials is further enhanced, the modified phenolic fibers and cementing materials can be better bridged in the recycled aggregate pervious concrete, the generation of recycled aggregate pervious concrete cracks is reduced, and the quality of the recycled aggregate pervious concrete is improved.
2. According to the application, the admixture prepared from 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether is doped into the recycled aggregate permeable concrete, so that on one hand, the alkalinity of the recycled aggregate permeable concrete can be reduced, the formed ettringite is promoted to be in a lath shape crystal, the formation of needle-shaped or sheet-shaped crystal ettringite is avoided, so that larger crystal stress is generated to cause cracking of the concrete, and on the other hand, the transformation of the ettringite crystal can be slowed down, the effect of inhibiting swelling cracking of the recycled aggregate permeable concrete caused by the increase of the solid phase volume of the ettringite is achieved, and therefore, the corrosion of sulfate on the recycled aggregate permeable concrete is slowed down, and the problem of durability reduction of the recycled aggregate permeable concrete caused by the corrosion of sulfate is reduced.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
Preparation example 1
A modified phenolic fiber adopts the following preparation method:
Step (1): phenolic resin, nitrile rubber, polypropylene were mixed in a ratio of 1:0.5:0.1, and extruding and granulating to obtain modified phenolic resin;
Step (2): carrying out melt spinning on the modified phenolic resin to prepare prefabricated modified phenolic fibers;
Step (3): mixing the prefabricated modified phenolic fiber with polydimethylsiloxane and epoxypropyl methyl ether according to the proportion of 1:3:2, uniformly mixing, heating to 55 ℃, stirring for 5 hours, filtering and drying to obtain the modified phenolic fiber.
Preparation example 2
Unlike preparation example 1, the modified phenolic fiber was prepared by the following method:
Step (1): phenolic resin, nitrile rubber, polypropylene were mixed in a ratio of 2:0.7:0.3, and extruding and granulating to obtain modified phenolic resin;
Step (2): carrying out melt spinning on the modified phenolic resin to prepare prefabricated modified phenolic fibers;
Step (3): mixing the prefabricated modified phenolic fiber with polydimethylsiloxane and epoxypropyl methyl ether according to the proportion of 2:5:3, uniformly mixing, heating to 60 ℃, stirring for 6 hours, filtering and drying to obtain the modified phenolic fiber.
Preparation example 3
Unlike preparation example 1, the modified phenolic fiber does not contain polydimethylsiloxane in step (3).
Preparation example 4
Unlike preparation example 1, the modified phenolic fiber does not contain epoxypropyl methyl ether in step (3).
Preparation example 5
A modified phenolic fiber, unlike in preparation example 1, does not contain step (3).
Example 1
The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises 190kg of silicate cement, 700kg of machine-made sand, 520kg of natural coarse aggregate, 450kg of recycled aggregate, 8kg of silica fume, 7kg of rice hull ash, 5kg of modified phenolic fiber, 3.9kg of water reducer, 10kg of admixture and 200kg of water.
Wherein the fineness modulus of the machine-made sand is 2.5-3.0.
Wherein the natural coarse aggregate is continuous-grade broken stone with the grain diameter of 4-13 mm.
Wherein the recycled aggregate is continuous recycled aggregate with the particle size of 4-13 mm.
Wherein the water reducer is a polycarboxylate water reducer.
Wherein the modified phenolic fiber is from preparation example 1.
Wherein the admixture is 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone, propylene glycol propyl ether with the weight ratio of 20:10:5:90 mass ratio.
The preparation method of the admixture comprises the steps of mixing 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether at normal temperature, and uniformly stirring.
The preparation method of the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises the following steps of:
step one: pre-wetting recycled aggregate, firstly mixing natural coarse aggregate, recycled aggregate and 1/2 mass of water in a formula, and stirring for 2min;
Step two: adding silicate cement, machine-made sand, silica powder, rice hull ash, modified phenolic fiber, a water reducing agent and an admixture, mixing, and stirring for 2min;
step three: adding the rest water in the formula, and stirring for 2min to obtain the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete.
Example 2
The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete is different from the embodiment 1 in that the concrete comprises 190kg of silicate cement, 700kg of machine-made sand, 520kg of natural coarse aggregate, 450kg of recycled aggregate, 8kg of silica fume, 7kg of rice hull ash, 5kg of modified phenolic fiber, 3.9kg of water reducer and 200kg of water.
Wherein the modified phenolic fiber was from preparation 2.
Wherein the admixture is 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone, propylene glycol propyl ether and the weight ratio of the 1-propane sulfonic acid to the sodium polystyrene sulfonate is 25:15:7:80 by mass ratio.
The preparation method of the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises the following steps of:
step one: pre-wetting recycled aggregate, firstly mixing natural coarse aggregate, recycled aggregate and 1/3 of water in the formula, and stirring for 1min;
Step two: adding silicate cement, machine-made sand, silica powder, rice hull ash, modified phenolic fiber, a water reducing agent and an admixture, mixing, and stirring for 1min;
Step three: adding the rest water in the formula, and stirring for 1min to obtain the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete.
Example 3
Unlike example 1, the recycled aggregate pervious concrete with corrosion resistance and high fracture resistance comprises 240kg of Portland cement, 740kg of machine-made sand, 580kg of natural coarse aggregate, 500kg of recycled aggregate, 12kg of silica fume, 10kg of rice hull ash, 8kg of modified phenolic fiber, 6.7kg of water reducer, 15kg of admixture and 250kg of water.
Wherein the admixture is 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone, propylene glycol propyl ether with the weight ratio of 30:20:10:70 mass ratio.
Example 4
Unlike example 2, the admixture does not contain 1-propane sulfonic acid.
Example 5
Unlike example 2, the admixture does not contain sodium polystyrene sulfonate.
Example 6
Unlike example 2, the admixture does not contain polyvinylpyrrolidone.
Example 7
Unlike example 2, the admixture does not contain propylene glycol propyl ether.
Example 8
Unlike example 2, the recycled aggregate pervious concrete with high corrosion resistance and high fracture resistance does not contain any admixture.
Comparative example 1
Unlike example 8, the modified phenolic fiber was derived from preparation example 3.
Comparative example 2
Unlike example 8, the modified phenolic fiber was derived from preparation example 4.
Comparative example 3
Unlike example 8, the modified phenolic fiber was derived from preparation example 5.
Performance test:
Permeability coefficient (mm/s): performing water permeability coefficient test according to the pavement water permeability coefficient test method in CJJ/T135-2009 technical Specification of Water permeable Cement concrete pavement; test piece size: the water permeability coefficient (mm/s) of the high-viscosity high-permeability fine stone sprayed concrete is detected at 15 ℃ after the concrete is cured for 28 days in a standard curing environment, wherein the higher the water permeability coefficient is, the better the water permeability is.
Compressive strength (MPa): compressive strength testing is carried out according to compressive strength tests in GB/T50081-2016 Standard for common concrete mechanical Property test methods; test piece size: after curing for 28 days in a standard curing environment, the compressive strength (MPa) of the high-viscosity high-permeability fine stone sprayed concrete is detected, and the moisture in the test piece is drained before detection and the moisture on the surface of the test piece is wiped.
Flexural strength (MPa): performing a flexural strength test according to the flexural strength test in GB/T50081-2016 Standard for common concrete mechanical Property test methods; test piece size: after curing for 28 days in a standard curing environment, the flexural strength (MPa) of the high-viscosity high-permeability fine stone sprayed concrete is detected, wherein the length is 100mm, the width is 100mm and the height is 400 mm.
Corrosion resistance coefficient (%): the corrosion resistance coefficient (%) is tested by referring to the sulfate erosion resistance test in GB/T50082-2009 Standard for test method of ordinary concrete Long-term Performance and durability; test piece size: the length is 100mm, the width is 100mm, the height is 100mm, and the specific test method comprises the following steps: taking a test piece which is cured for 28 days in a standard curing environment, firstly placing the test piece in a 5% Na 2SO4 solution for soaking for 16 hours at normal temperature, wherein the height of the soaking solution is 300mm higher than the upper surface of the test piece, then drying the test piece at a constant temperature in an oven at 80 ℃ for 6 hours, taking out and cooling the test piece for 1 hour, namely, one dry-wet cycle, controlling the cycle time to be 24 hours each time, testing the compression strength (MPa) of the test piece after 30 times of cycles, and calculating the corrosion resistance coefficient (%), wherein the higher the corrosion resistance coefficient is, the better the sulfate erosion resistance is.
The results of the above performance tests are shown in Table 1.
Table 1:
By combining example 8, comparative examples 1 to 3 and Table 1, it was found that the recycled aggregate pervious concrete having excellent water permeability, compressive strength and flexural strength could be obtained by adding the modified phenolic fibers further treated with polydimethylsiloxane and epoxypropyl methyl ether to the recycled aggregate pervious concrete. The concrete analysis shows that the modified phenolic fiber subjected to the further treatment of the polydimethylsiloxane and the epoxypropyl methyl ether has better hydrophobicity and stronger cohesive force, the modified phenolic fiber can be better bonded with other raw materials in the recycled aggregate pervious concrete, can be better bridged in the recycled aggregate pervious concrete, reduces the generation of recycled aggregate pervious concrete cracks, realizes the quality improvement of the recycled aggregate pervious concrete, and simultaneously reduces the non-uniformity phenomenon of the concrete caused by fiber aggregation in the concrete, so that the pores of the recycled aggregate pervious concrete can be more uniformly distributed, the recycled aggregate pervious concrete can have better water permeability, and the water permeability and mechanical property of the pervious concrete can be well balanced.
By combining examples 1 to 3, examples 4 to 8 and Table 1, it was found that recycled aggregate pervious concrete having excellent water permeability, compressive strength, flexural strength and sulfate corrosion resistance can be obtained by adding an admixture prepared from 1-propanesulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether to recycled aggregate pervious concrete. The concrete analysis shows that the compounding of the 1-propane sulfonic acid, the sodium polystyrene sulfonate, the polyvinylpyrrolidone and the propylene glycol propyl ether has specificity, and only the compounding of the four components can well balance the alkalinity of the recycled aggregate pervious concrete and inhibit the transformation of the calcite crystals, and meanwhile, the recycled aggregate pervious concrete skeleton can be further filled, the recycled aggregate pervious concrete skeleton is compacted, the binding force between the recycled aggregate and other raw materials in the concrete is further enhanced, and therefore the recycled aggregate pervious concrete with good quality is obtained.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (6)
1. The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete is characterized by comprising the following components in parts by weight: 190-240 parts of Portland cement, 700-740 parts of machine-made sand, 520-580 parts of natural coarse aggregate, 450-500 parts of recycled aggregate, 8-12 parts of silicon powder, 7-10 parts of rice hull ash, 5-8 parts of modified phenolic fibers, 3.9-6.7 parts of water reducer and 200-250 parts of water, wherein the preparation method of the modified phenolic fibers comprises the following steps:
(1) Phenolic resin, nitrile rubber and polypropylene (1-2): (0.5 to 0.7): (0.1-0.3) melting and mixing uniformly, extruding and granulating to obtain modified phenolic resin;
(2) Carrying out melt spinning on the modified phenolic resin to prepare prefabricated modified phenolic fibers;
(3) Uniformly mixing the prefabricated modified phenolic fibers with polydimethylsiloxane and epoxypropyl methyl ether, heating, stirring, filtering and drying to obtain modified phenolic fibers;
The mass ratio of the prefabricated modified phenolic fiber to the polydimethylsiloxane to the epoxypropyl methyl ether is (1-2): (3-5): (2-3);
The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete further comprises 10-15 parts of an admixture, wherein the admixture comprises 1-propanesulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether;
The additive comprises, by mass, 20-30 parts of 1-propane sulfonic acid, 10-20 parts of sodium polystyrene sulfonate, 5-10 parts of polyvinylpyrrolidone and 70-90 parts of propylene glycol propyl ether;
The preparation method of the corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete comprises the following steps of:
step one: pre-wetting recycled aggregate, firstly mixing natural coarse aggregate, recycled aggregate and 1/3-1/2 mass of water in a formula, and stirring for 1-2 min;
Step two: adding silicate cement, machine-made sand, silica powder, rice hull ash, modified phenolic fibers, a water reducing agent and an admixture, mixing, and stirring for 1-2 minutes;
Step three: and adding the rest water in the formula, and stirring for 1-2 min to obtain the corrosion-resistant high-fracture-resistant recycled aggregate pervious concrete.
2. The recycled aggregate pervious concrete with corrosion resistance and high fracture resistance according to claim 1, wherein the preparation method of the admixture is as follows: and uniformly mixing 1-propane sulfonic acid, sodium polystyrene sulfonate, polyvinylpyrrolidone and propylene glycol propyl ether at normal temperature to obtain the admixture.
3. The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete according to claim 1, wherein the recycled aggregate is continuous recycled aggregate with a particle size of 4-13 mm.
4. The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete according to claim 1, wherein the natural coarse aggregate is continuous-grade broken stone with the particle size of 4-13 mm.
5. The corrosion-resistant high-fracture-resistance recycled aggregate pervious concrete according to claim 1, wherein the fineness modulus of the machine-made sand is 2.5-3.0.
6. The recycled aggregate pervious concrete with corrosion resistance and high fracture resistance according to claim 1, wherein the water reducing agent is a polycarboxylate water reducing agent.
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