CN113880522A - Pervious concrete and preparation method thereof - Google Patents
Pervious concrete and preparation method thereof Download PDFInfo
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- CN113880522A CN113880522A CN202111237671.6A CN202111237671A CN113880522A CN 113880522 A CN113880522 A CN 113880522A CN 202111237671 A CN202111237671 A CN 202111237671A CN 113880522 A CN113880522 A CN 113880522A
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- basalt
- pervious concrete
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title description 25
- 239000000835 fiber Substances 0.000 claims abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003822 epoxy resin Substances 0.000 claims abstract description 43
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 43
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 18
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 17
- 229960000892 attapulgite Drugs 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000004593 Epoxy Substances 0.000 claims abstract description 15
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 32
- 244000060011 Cocos nucifera Species 0.000 claims description 32
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 15
- 241000196324 Embryophyta Species 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 235000012239 silicon dioxide Nutrition 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 240000000907 Musa textilis Species 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000005543 nano-size silicon particle Substances 0.000 claims description 4
- 238000007385 chemical modification Methods 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 18
- 230000035699 permeability Effects 0.000 abstract description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 241001330002 Bambuseae Species 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000010257 thawing Methods 0.000 description 4
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical group C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- -1 sodium alkyl benzene Chemical class 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical class C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical group C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 244000198134 Agave sisalana Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 240000006240 Linum usitatissimum Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000013305 flexible fiber Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 description 1
- 239000004843 novolac epoxy resin Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical group CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/281—Polyepoxides
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the technical field of concrete, in particular to pervious concrete, which comprises the following raw materials in parts by weight: 40-60 parts of water, 90-130 parts of cement, 550 parts of basalt 450-doped materials, 70-90 parts of admixture, 1.5-2.7 parts of water reducing agent, 0.5-1.7 parts of air entraining agent, 35-55 parts of epoxy resin, 8-28 parts of curing agent, 8-20 parts of modified fiber and 8-12 parts of epoxy silane coupling agent; the modified fiber comprises the following components in parts by weight: 5-13 parts of modified basalt fiber and 3-7 parts of plant fiber; the modified basalt fiber is processed by basalt and attapulgite with the weight ratio of (10-14) to (2-5). This application makes pervious concrete possess good water permeability coefficient when, has improved compressive strength, rupture strength and anti freeze-thaw resistance number of times.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to pervious concrete and a preparation method thereof.
Background
The concrete is one of the main civil engineering materials, is prepared by a cementing material, an aggregate, water, an additive and an admixture which are added if necessary according to a certain proportion and is evenly stirred. With the advance of urban development, higher requirements are put on the performance of concrete.
At present, the concrete for urban roads needs to have good water permeability, assist the drainage of urban drainage systems, quickly eliminate accumulated water on the roads, quickly seep rainwater underground, supplement underground water and maintain the ecological balance of the underground water and soil. However, pervious concrete has the problems of large particle gaps, poor cohesive force, low strength, low freeze-thaw resistance and easy cracking.
Disclosure of Invention
The application provides a pervious concrete and a preparation method thereof aiming at the problems of low freezing and thawing resistance and easy cracking of the pervious concrete.
In a first aspect, the application provides a pervious concrete, which adopts the following technical scheme:
the pervious concrete comprises the following raw materials in parts by weight: 40-60 parts of water, 90-130 parts of cement, 550 parts of basalt 450-doped materials, 70-90 parts of admixture, 1.5-2.7 parts of water reducing agent, 0.5-1.7 parts of air entraining agent, 35-55 parts of epoxy resin, 8-28 parts of curing agent, 8-20 parts of modified fiber and 8-12 parts of epoxy silane coupling agent; the modified fiber comprises the following components in parts by weight: 5-13 parts of modified basalt fiber and 3-7 parts of plant fiber; the modified basalt fiber is processed by basalt and attapulgite with the weight ratio of (10-14) to (2-5).
By adopting the technical scheme, the basalt has the advantages of strong compressive resistance, low crushing value, strong corrosion resistance and good wear resistance, and is selected as the coarse aggregate. The admixture is at least one of fly ash, silica fume or mineral powder, is a sphere with small radius and smooth surface compared with the coarse aggregate, and can be filled into the pores of the coarse aggregate and the pores between the coarse aggregate and cement, thereby improving the strength of the pervious concrete. Wherein the main component of the fly ash is SiO2And Al2O3Ca (OH) which is a product of hydration reaction with cement2The reaction is carried out for the second hydration reaction to generate C-S-H gel, the product enables fine pores among the pervious concrete coarse aggregates to be filled, the bonding area is increased, and the freezing and thawing resistance can be increased when the static water pressure and the osmotic pressure generated by freezing and thawing circulation are applied.
The water reducing agent is selected from at least one of polycarboxylic acid high-performance water reducing agent or naphthalene sulfonate water reducing agent, the water reducing agent is added into the cement base to increase the fluidity, and the cement base with high fluidity flows into gaps of the fiber bundles to form a base film. Meanwhile, the water reducing agent is used as an anionic surfactant, so that the ion adsorption effect on the surface of the fiber can be reduced, the van der Waals force, the electrostatic adsorption force and the ion adsorption force are reduced to the minimum value, and the fiber is easier to disperse under the external force of stirring. The air entraining agent is an additive which leads air to be introduced into a concrete mixture during stirring to form micro bubbles, and is selected from at least one of sulfonate, such as alkyl sodium sulfonate and sodium alkyl benzene sulfonate, and the micro bubbles can greatly improve the workability of the concrete and improve the durability of impermeability, frost resistance and the like.
Compared with cement, the epoxy resin is a flexible material, and is a good adhesive base material under the frost heaving effect. The epoxy resin has high crosslinking degree after being cured, is in a three-dimensional network structure, can generate deformation, absorbs strain energy and improves the freeze-thaw resistance. The curing agent is a substance for curing epoxy resin, and specifically at least one of bisphenol A type epoxy resin, novolac epoxy resin, polyamide or alicyclic epoxy resin is selected.
The basalt fiber has high temperature resistance and chemical stability, and has good compatibility with cement. The tensile strength of the basalt fiber is 2-2.5 times of that of metal, 10 times of that of polypropylene fiber, and is higher than that of carbon fiber, and the breaking elongation of the basalt fiber is superior to that of the carbon fiber. The basalt fiber can be doped to increase the high-temperature stability and low-temperature crack resistance of the pervious concrete and delay the aging speed; but its water permeability is relatively poor. Therefore, in the application, attapulgite is added into basalt to prepare modified basalt fiber; attapulgite, also known as palygorskite, is a clay mineral containing water and rich in magnesium silicate with chain layer structure, and is a natural one-dimensional nano material, the crystal form is fibrous, rod-like or needle-like, the interior of the crystal contains a large number of one-dimensional regular pore channels parallel to the extending direction of the crystal, and the interior of the crystal has multiple pore channels and multiple grooves on the surface and can permeate water molecules. The attapulgite and the basalt are used in a matching way, so that the mechanical strength of the concrete is improved, and the water permeability can be relatively improved.
The plant fiber can be divided into the following parts according to different plant parts: wood fibers such as bamboo fibers or reed fibers; stalk fibers such as straw fibers or flax fibers; leaf fibers, such as sisal or abaca fibers; skin fibers, such as coconut fibers or cotton linter fibers. The plant fiber is a renewable substance, so that resources and energy can be saved; and the irregular distribution of the plant fibers plays a role in connection in the pervious concrete, so that the toughness is improved, and the bleeding and segregation of the concrete are reduced.
The modified fiber is formed by mixing modified basalt fiber and plant fiber, and the modified basalt fiber is used as rigid fiber to enhance the compressive strength and rigidity of the pervious concrete; the plant fiber is used as a flexible fiber framework to enhance the tensile strength and toughness of the pervious concrete; the modified basalt fiber and the plant fiber are matched together in the pervious concrete to form a three-dimensional structure. The brittleness of the modified basalt fiber is improved due to too strong rigidity, the strength is not enough and the mechanical property is reduced due to too much plant fiber, so that the modified basalt fiber and the plant fiber need to be in a proper proportion.
The epoxy silane coupling agent is easy to couple with epoxy resin, is beneficial to prolonging molecular chains and promoting the formation of a cross-linked network, and further increases the compressive strength of the pervious concrete. In addition, hydroxyl on silanol hydrolyzed by the epoxy silane coupling agent is easy to dehydrate and condense with silicon hydroxyl on the surface of portland cement, so that the epoxy silane coupling agent is used as a bridge to organically combine inorganic filler and organic matters, and the compressive strength of the pervious concrete is improved.
Preferably, the pervious concrete is prepared from the following raw materials in parts by weight: 50-55 parts of water, 100-120 parts of cement, 525 parts of basalt 475-doped materials, 80-85 parts of admixture, 1.8-2.4 parts of water reducing agent, 0.8-1.4 parts of air entraining agent, 40-50 parts of epoxy resin, 8-28 parts of curing agent, 11-17 parts of modified fiber and 9-11 parts of epoxy silane coupling agent.
By adopting the technical scheme, the proportion of each component is optimized, and the performance parameters of the pervious concrete are improved.
Preferably, the weight ratio of the modified fiber to the epoxy resin is 1 (3-4).
By adopting the technical scheme, the epoxy resin pervious concrete has excellent compression resistance, but the breaking strength is weak; the modified fiber has excellent breaking strength and fracture resistance; the proper proportion of the modified fiber and the epoxy resin can increase the compression strength and the rupture strength of the pervious concrete.
Preferably, the plant fiber is one or more of coconut fiber, bamboo fiber or abaca fiber.
Preferably, the coconut fiber is modified coconut fiber subjected to oxidation heat treatment.
By adopting the technical scheme, under the alkaline condition, the reaction is carried out through H2O2Soaking in the solution to dissolve higher lignin and pectin components on the surface of the coconut fiber, eroding the surface of the plant fiber, and making the surface of the coconut fiber rougher through soaking, thereby effectively reducing the water absorption of the coconut fiber and enabling the surface of the coconut fiber to be in uniformly arranged grooves so as to be tightly combined with the cementing material; and tiny pit holes are inserted at intervals of the grooves, so that the early-stage drying shrinkage deformation of the concrete can be reduced, and the compressive strength of the concrete is increased.
Preferably, the modified basalt fiber is prepared by the following steps: crushing basalt to obtain basalt crushed stone; mixing and melting the basalt macadam and attapulgite according to the parts by weight to obtain molten liquid; and drawing the molten liquid, and cooling to obtain the modified basalt fiber.
By adopting the technical scheme, the basalt is crushed into particles with the particle size of 5mm-20mm, the particle size of the attapulgite is generally smaller than 0.01mm, the basalt crushed stone and the attapulgite are mixed and then are subjected to wire drawing and cooling through high-temperature melting at 1400-1600 ℃, so that the attapulgite is fully dispersed in the basalt fiber, and the internal water absorption channel of the basalt fiber is increased, so that the water permeability of the modified basalt fiber can be improved while the excellent high-temperature resistance, chemical stability, tensile strength and other properties of the modified basalt fiber are maintained.
Preferably, the epoxy resin is a modified epoxy resin subjected to chemical modification treatment of silica.
By adopting the technical scheme, the toughness and the heat resistance of the epoxy resin are poor, the silicon dioxide and the liquid epoxy resin are subjected to chemical reaction, flexible silicon-oxygen bonds are introduced, silicon-oxygen-carbon bonds and silicon-oxygen-silicon bonds are bonded in modified epoxy resin molecules, the toughness of the epoxy resin is improved, and the breaking strength can be improved when the modified epoxy resin is applied to pervious concrete.
Preferably, the silicon dioxide is gas phase nano silicon dioxide, and the particle size is 6nm-10 nm.
By adopting the technical scheme, the gas-phase nano silicon dioxide has a three-dimensional network structure, so that the modified epoxy resin is semitransparent, uniform and stable. When the particle size of the silicon dioxide is too large, the silicon dioxide is easy to separate out, and the modified product is unstable; and when the particle size of the silicon dioxide is too large, the specific surface area is relatively small, the activity of silanol groups on the surface is low, and the modified epoxy resin is easy to settle and generate a layering phenomenon, so that the stability is low.
Preferably, the length of the modified fiber is 6mm to 10 mm.
By adopting the technical scheme, the length of the modified fiber is 6-10 mm, which is beneficial to connecting adjacent basalt broken stones, increasing the dispersibility and improving the flexural strength and toughness of the concrete.
In a second aspect, the present application provides a method for preparing any one of the foregoing pervious concrete, which is specifically realized by the following technical scheme:
a preparation method of pervious concrete comprises the following steps:
uniformly mixing cement, basalt, an admixture, epoxy resin and modified fiber, adding half of water, and uniformly stirring to obtain a mixture A;
adding a water reducing agent, an air entraining agent, an epoxy silane coupling agent and a curing agent into the mixture A, and uniformly stirring to obtain a mixture B;
and adding the rest water into the mixture B, and uniformly stirring to obtain the pervious concrete.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the compressive strength, the flexural strength, the water permeability coefficient and the freeze-thaw resistance of the pervious concrete in the embodiment of the application can reach 62.1MPa, 8.3MPa, 8.5mm/s and 214 times at most, so that the compressive strength and the flexural strength are effectively improved, and the pervious concrete also has a higher water permeability coefficient;
2. the epoxy resin is modified by adopting the gas-phase nano silicon dioxide, so that the toughness of the epoxy resin can be improved, and the modified epoxy resin is applied to the pervious concrete so as to improve the breaking strength of the concrete.
Detailed Description
The present application will be described in further detail with reference to specific examples.
The following raw materials in the application are all commercially available products, and specifically: the cement is 42.5 grade ordinary portland cement; the basalt is selected from Jiangsu, Yabang mining Co Ltd; the admixture is fly ash selected from new materials of limestone (Zhejiang) and has a bulk density of 0.79kg/m3The water content is less than or equal to 1 percent; the air entraining agent is selected from sodium dodecyl sulfate of Guangzhou Tengfeng chemical industry Co.Ltd; the water reducing agent is selected from Jiangsu Subot new materials GmbH
A series of polycarboxylic acid high-efficiency water reducing agents; the epoxy resin is bisphenol A epoxy resin of Baisheng fine chemical Co., Ltd, Fuzhou, epoxy equivalent of 200g/mol, viscosity of 20450mPa & s at 25 ℃, and density of 1.1g/cm3(ii) a The coconut fiber, the abaca fiber and the bamboo fiber are selected from Shandong Yihao geotechnical material Co., Ltd; the attapulgite is selected from Xuyi county medium-grade attapulgite clay GmbH; the precipitated silica and the gas phase nano silica are both selected from Qingdao Yingchuang silica materials GmbH, wherein the particle size of the precipitated silica is 4 μm; the curing agent is selected from methylhexahydrophthalic anhydride from Shandong Qingyang New materials Co; the epoxy silane coupling agent is selected from gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane of Nanjing warp weft chemical Co., Ltd; the promoter is selected from triphenylphosphine of TCI brand of Shanghai Ji to Biochemical technology, Inc., and the purity is more than 95%.
The following are examples of the preparation of the modified basalt fiber of the present application:
preparation example 1
The modified coconut fiber is prepared by the following steps:
washing 10kg of coconut fiber with water;
adding cleaned coconut fiber into 500L of 5% NaOH solution and 500L of 10% H2O2Soaking the mixture in the mixed solution for 5 hours;
heating the soaked coconut fibers to 100 ℃, and carrying out heat treatment for 1 h;
washing the coconut fiber after heat treatment to be neutral;
drying the coconut fibers washed to be neutral by water;
and shearing the dried coconut fiber into coconut fiber with the length of 6mm-10mm to obtain the modified coconut fiber.
Preparation example 2
The modified basalt fiber is prepared by the following method:
crushing basalt with the weight shown in table 1 to obtain basalt broken stone with the particle size of 5mm-20 mm;
mixing the basalt macadam and attapulgite, and then melting at high temperature of 1500 ℃ to obtain molten liquid;
and drawing the molten liquid, controlling the length of the basalt fiber to be 6-10 mm, and cooling to obtain the modified basalt fiber.
Preparation examples 3 to 5
The modified basalt fibers of preparation examples 3 to 5 were prepared in the same manner as in preparation example 2, except that: the mixing amount of each raw material is different, and the specific details are shown in Table 1.
TABLE 1 blending amounts (unit: kg) of respective raw materials of modified basalt fibers of production examples 2 to 5
| Raw materials | Preparation example 2 | Preparation example 3 | Preparation example 4 | Preparation example 5 |
| Basalt rock | 10 | 12 | 13 | 14 |
| Attapulgite | 2 | 3 | 4 | 5 |
Preparation example 6
The modified epoxy resin is prepared by the following method:
adding 1kg of liquid epoxy resin into a reactor, heating to 80 ℃, and stirring by using a stirrer; adding 0.1kg of precipitated silica powder and 0.01kg of accelerant under a stirring state, wherein the accelerant in the preparation example is triphenylphosphine, and adding the silica powder into the reactor at a speed of 1g/3s, and uniformly stirring; heating to 100 ℃ for 2 h; heating to 150 ℃ for modification reaction for 2.5h, stirring and cooling to obtain the modified epoxy resin.
Preparation examples 7 to 9
The modified epoxy resins of preparation examples 7 to 9 were prepared in the same manner as in preparation example 6 except that: the precipitated silica powder was replaced with the same amount of fumed silica powder having particle diameters of 6nm, 8nm and 10nm, respectively, and the rest was the same as in preparation example 6.
Example 1
In this example 1, the admixture is fly ash, the water reducing agent is a polycarboxylic acid water reducing agent, the air entraining agent is sodium alkylsulfonate, the curing agent is methylhexahydrophthalic anhydride, and the epoxy resin is bisphenol a epoxy resin.
According to the weight of each component in the table 2, cement, basalt with the grain size of 5mm-20mm, admixture, epoxy resin, coconut fiber and the modified basalt fiber prepared in the preparation example 2 are uniformly mixed, then half of water is added, and the mixture is uniformly stirred to obtain a mixture A;
adding a water reducing agent, an air entraining agent, an epoxy silane coupling agent and a curing agent into the mixture A, and uniformly stirring to obtain a mixture B;
and adding the rest water into the mixture B, and uniformly stirring to obtain the pervious concrete.
Examples 2 to 3
The pervious concrete of examples 2-3 was prepared in the same manner as in example 1, except that: coconut fibers were replaced with equal amounts of bamboo fibers and abaca fibers, respectively, and the rest was the same as in example 1.
Examples 4 to 7
The pervious concrete of examples 4-7 was prepared in the same manner as in example 1, except that: the mixing amount of each raw material is different, and the specific details are shown in Table 2.
TABLE 2 blending amounts (unit: kg) of respective raw materials of the pervious concretes of examples 1 to 7
| Raw materials | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 |
| Water (W) | 40 | 40 | 40 | 45 | 50 | 55 | 60 |
| Cement | 90 | 90 | 90 | 100 | 110 | 120 | 130 |
| Basalt rock | 450 | 450 | 450 | 475 | 500 | 525 | 550 |
| Blending material | 70 | 70 | 70 | 75 | 80 | 85 | 90 |
| Water reducing agent | 1.5 | 1.5 | 1.5 | 1.8 | 2.1 | 2.4 | 2.7 |
| Air entraining agent | 0.5 | 0.5 | 0.5 | 0.8 | 1.1 | 1.4 | 1.7 |
| Epoxy resin | 35 | 35 | 35 | 40 | 45 | 50 | 55 |
| Curing agent | 8 | 8 | 8 | 13 | 18 | 23 | 28 |
| Modified basalt fiber | 5 | 5 | 5 | 7 | 9 | 11 | 13 |
| Coconut fiber | 3 | 0 | 0 | 4 | 5 | 6 | 7 |
| Bamboo fiber | 0 | 3 | 0 | 0 | 0 | 0 | 0 |
| Coconut fiber | 0 | 0 | 3 | 0 | 0 | 0 | 0 |
| Epoxy silane coupling agent | 8 | 8 | 8 | 9 | 10 | 11 | 12 |
Examples 8 to 10
The pervious concrete of examples 8-10 was prepared in the same manner as in example 5, except that: the modified basalt fibers prepared in preparation examples 3-5 are respectively selected as the modified basalt fibers, and the rest is the same as in example 5.
Example 11
The pervious concrete of example 11 was prepared in the same manner as example 9, except that: the coconut fiber was modified coconut fiber obtained in production example 1, and the rest was the same as in example 9.
Examples 12 to 15
The pervious concretes of examples 12-15 were prepared in the same manner as in example 11, except that: the modified epoxy resins obtained in preparation examples 6 to 9 were used as the epoxy resin, and the rest was the same as in example 11.
Examples 16 to 18
The pervious concretes of examples 16-18 were prepared in the same manner as example 14, except that: the weight ratios of the modified fiber to the modified epoxy resin were 1:3, 1:3.5, and 1:4, respectively, the amount of the modified epoxy resin and the amount of the curing agent were adjusted accordingly, and the remainder was the same as in example 14, and the specific details of the amounts of the respective raw materials are shown in table 3.
TABLE 3 blending amounts (unit: kg) of respective raw materials of the pervious concretes of examples 16 to 18
| Raw materials | Example 16 | Example 17 | Example 18 |
| Water (W) | 50 | 50 | 50 |
| Cement | 110 | 110 | 110 |
| Basalt rock | 500 | 500 | 500 |
| Blending material | 80 | 80 | 80 |
| Water reducing agent | 2.1 | 2.1 | 2.1 |
| Air entraining agent | 1.1 | 1.1 | 1.1 |
| Modified epoxy resin | 42 | 49 | 56 |
| Curing agent | 16.8 | 19.6 | 22.4 |
| Modified basalt fiber | 9 | 9 | 9 |
| Modified coconut fiber | 5 | 5 | 5 |
| Epoxy silane coupling agent | 10 | 10 | 10 |
Comparative example 1
The pervious concrete of comparative example 1 was prepared in the same manner as in example 1 except that: the modified basalt fiber was not added to the raw material of the modified fiber, and the rest was the same as in example 1.
Comparative example 2
The pervious concrete of comparative example 2 was prepared in the same manner as in example 1 except that: the raw materials of the modified basalt fiber are not added with attapulgite, and the rest is the same as that of the embodiment 1.
Comparative example 3
The pervious concrete of comparative example 3 was prepared in the same manner as in example 1 except that: the modified fiber was prepared in the same manner as in example 1, except that no coconut fiber was added.
Comparative example 4
The pervious concrete of comparative example 4 was prepared in the same manner as in example 1 except that: the raw materials were the same as in example 1 except that no epoxy resin and no curing agent were added.
Performance detection
The 28d compressive strength and flexural strength properties of examples 1-18 and comparative examples 1-4 were measured using GB/T50081-2002 Standard test methods for mechanical Properties of ordinary concrete, and the results are shown in Table 4.
The performance of the pervious concrete of examples 1-18 and comparative examples 1-4 was measured by CJJ/T135-2009 technical Specification for pervious cement concrete pavements, and the results are shown in Table 4.
The pervious concrete of examples 1-18 and comparative examples 1-4 is subjected to performance measurement by adopting a rapid freeze-thaw cycle experimental method in GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete, and the detection results are shown in Table 4.
TABLE 4 Performance test results for different pervious concretes
The test results in table 4 show that the 28d compressive strength of the pervious concrete of the examples of the present application can be up to 62.1MPa, the flexural strength can be up to 8.3MPa, the permeability coefficient can be up to 8.5mm/s, and the number of times of freeze-thaw resistance can be up to 214 times.
In examples 1 to 7, the 28d compressive strength, the flexural strength, the water permeability coefficient and the freeze-thaw resistance of the pervious concrete of example 5 were 53.8MPa, 8.14MPa, 7.6mm/s and 202 times, respectively, which are superior to the corresponding performance parameters of the pervious concrete of examples 1 to 4 and 6, indicating that the blending ratio of the raw materials of the pervious concrete of example 5 is superior.
In examples 8 to 10, the 28d compressive strength, flexural strength, water permeability coefficient and freeze-thaw resistance of the pervious concrete of example 9 were 57.2MPa, 8.19MPa, 7.9mm/s and 204 times, respectively, which were superior to the corresponding performance parameters of the pervious concrete of examples 8 and 10.
The 28d compressive strength, the breaking strength, the water permeability and the freezing and thawing resistance times of the coconut fiber in the example 11 are respectively 58.5MPa, 8.22MPa, 8.0mm/s and 207 times, which are superior to the corresponding performance parameters of the example 9, and the comprehensive performance of the modified coconut fiber obtained by modifying the coconut fiber is better.
In examples 12 to 15, the 28d compressive strength, the flexural strength, the water permeability coefficient and the freeze-thaw resistance times of the pervious concrete of example 14 were 61.4MPa, 8.26MPa, 8.19mm/s and 213 respectively, which are superior to the corresponding performance parameters of the pervious concrete of examples 12, 13 and 15, indicating that the concrete prepared from the modified epoxy resin of preparation 8 has superior performance.
In examples 16-18, the flexural strength, water permeability coefficient and freeze-thaw resistance of the pervious concrete in example 17 were 8.30MPa, 8.30mm/s and 214 times, respectively, and example 17 was superior to the corresponding performance parameters of the pervious concrete in examples 16 and 18; example 18 had a 28d compressive strength of 62.1MPa and better than the 28d compressive strength of 62.0MPa of example 17; the combination of the modified fiber and epoxy resin in example 17 shows that the concrete prepared therefrom has excellent properties.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The pervious concrete is characterized by being prepared from the following raw materials in parts by weight: 40-60 parts of water, 90-130 parts of cement, 550 parts of basalt 450-doped materials, 70-90 parts of admixture, 1.5-2.7 parts of water reducing agent, 0.5-1.7 parts of air entraining agent, 35-55 parts of epoxy resin, 8-28 parts of curing agent, 8-20 parts of modified fiber and 8-12 parts of epoxy silane coupling agent;
the modified fiber comprises the following components in parts by weight: 5-13 parts of modified basalt fiber and 3-7 parts of plant fiber;
the modified basalt fiber is processed by basalt and attapulgite with the weight ratio of (10-14) to (2-5).
2. The pervious concrete of claim 1, characterized in that it is made from raw materials comprising, in parts by weight: 50-55 parts of water, 100-120 parts of cement, 525 parts of basalt 475-doped materials, 80-85 parts of admixture, 1.8-2.4 parts of water reducing agent, 0.8-1.4 parts of air entraining agent, 40-50 parts of epoxy resin, 8-28 parts of curing agent, 11-17 parts of modified fiber and 9-11 parts of epoxy silane coupling agent.
3. The pervious concrete of claim 1, wherein: the weight ratio of the modified fiber to the epoxy resin is 1 (3-4).
4. The pervious concrete of claim 1, wherein the plant fibers are one or more of coconut fibers, bamboo fibers, or abaca fibers.
5. The pervious concrete of claim 4, wherein: the coconut fiber is modified coconut fiber subjected to oxidation heat treatment.
6. The pervious concrete of claim 1, characterized in that said modified basalt fibers are prepared by the steps of:
crushing basalt to obtain basalt crushed stone;
mixing and melting the basalt macadam and attapulgite according to the parts by weight to obtain molten liquid;
and drawing the molten liquid, and cooling to obtain the modified basalt fiber.
7. The pervious concrete of claim 1, wherein: the epoxy resin is modified epoxy resin which is subjected to chemical modification treatment of silicon dioxide.
8. The pervious concrete of claim 7, wherein: the silicon dioxide is gas phase nano silicon dioxide, and the particle size is 6nm-10 nm.
9. The pervious concrete of claim 1, wherein: the length of the modified fiber is 6mm-10 mm.
10. A method for preparing pervious concrete according to any one of claims 1 to 9, comprising the steps of:
uniformly mixing cement, basalt, an admixture, epoxy resin and modified fiber, adding half of water, and uniformly stirring to obtain a mixture A;
adding a water reducing agent, an air entraining agent, an epoxy silane coupling agent and a curing agent into the mixture A, and uniformly stirring to obtain a mixture B;
and adding the rest water into the mixture B, and uniformly stirring to obtain the pervious concrete.
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| CN117285302A (en) * | 2023-10-17 | 2023-12-26 | 齐鲁高速(山东)装配有限公司 | Freeze thawing resistant pervious concrete and preparation method thereof |
| CN117285302B (en) * | 2023-10-17 | 2024-05-17 | 齐鲁高速(山东)装配有限公司 | Freeze thawing resistant pervious concrete and preparation method thereof |
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