CN115231884A - Regenerated backfill for building and preparation process thereof - Google Patents
Regenerated backfill for building and preparation process thereof Download PDFInfo
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- CN115231884A CN115231884A CN202210829097.1A CN202210829097A CN115231884A CN 115231884 A CN115231884 A CN 115231884A CN 202210829097 A CN202210829097 A CN 202210829097A CN 115231884 A CN115231884 A CN 115231884A
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- backfill
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- filler
- backfill soil
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- 238000002360 preparation method Methods 0.000 title abstract description 45
- 239000002689 soil Substances 0.000 claims abstract description 108
- 239000000945 filler Substances 0.000 claims abstract description 100
- 239000000835 fiber Substances 0.000 claims abstract description 87
- 239000000463 material Substances 0.000 claims abstract description 56
- 239000002131 composite material Substances 0.000 claims abstract description 52
- 238000001035 drying Methods 0.000 claims abstract description 28
- 238000005303 weighing Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 19
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000292 calcium oxide Substances 0.000 claims abstract description 18
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 230000001172 regenerating effect Effects 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 63
- 229910021536 Zeolite Inorganic materials 0.000 claims description 62
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 62
- 239000010457 zeolite Substances 0.000 claims description 62
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 53
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 53
- 239000002245 particle Substances 0.000 claims description 50
- 239000000741 silica gel Substances 0.000 claims description 50
- 229910002027 silica gel Inorganic materials 0.000 claims description 50
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 26
- 239000012943 hotmelt Substances 0.000 claims description 23
- 239000011265 semifinished product Substances 0.000 claims description 22
- 239000000047 product Substances 0.000 claims description 20
- 238000010276 construction Methods 0.000 claims description 18
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 17
- 239000002699 waste material Substances 0.000 claims description 17
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 15
- 229910052863 mullite Inorganic materials 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 13
- 241000037740 Coptis chinensis Species 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 11
- 239000011449 brick Substances 0.000 claims description 9
- 230000002209 hydrophobic effect Effects 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 3
- 238000004062 sedimentation Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 5
- 238000009435 building construction Methods 0.000 abstract description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 33
- 239000005038 ethylene vinyl acetate Substances 0.000 description 33
- 239000000243 solution Substances 0.000 description 30
- 230000000694 effects Effects 0.000 description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- 239000011148 porous material Substances 0.000 description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 238000011049 filling Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 239000001856 Ethyl cellulose Substances 0.000 description 8
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 8
- 229920001249 ethyl cellulose Polymers 0.000 description 8
- 235000019325 ethyl cellulose Nutrition 0.000 description 8
- 239000008187 granular material Substances 0.000 description 8
- 244000005700 microbiome Species 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 235000019441 ethanol Nutrition 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 3
- 230000000844 anti-bacterial effect Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 241000218202 Coptis Species 0.000 description 1
- 235000002991 Coptis groenlandica Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- -1 natural sandstone Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- 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
- C04B28/10—Lime cements or magnesium oxide 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2092—Resistance against biological degradation
-
- 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
Abstract
The application relates to the technical field of building construction, and particularly discloses a regenerative backfill soil for a building and a preparation process thereof; the regenerative backfill soil for the building comprises the following raw materials in parts by weight: 35-70 parts of regenerated backfill, 40-80 parts of natural sandstone, 4-10 parts of fly ash, 15-40 parts of calcium oxide, 2-8 parts of filler fiber and 5-15 parts of composite filler; the preparation process comprises the following steps: s1, weighing regenerated backfill and filler fiber, uniformly mixing, adding a composite filler, uniformly mixing, and drying to obtain a primary mixed material; s2, weighing natural sandstone, fly ash and calcium oxide, and mixing and stirring uniformly with the primary mixed material to obtain a finished product; the backfill soil has the advantage of difficult sinking or sedimentation even under the rainwater washing condition, and can be applied to the fields of foundation backfill and pipe ditch backfill.
Description
Technical Field
The application relates to the technical field of building construction, in particular to a regenerated backfill soil for a building and a preparation process thereof.
Background
The backfill soil refers to the backfill soil which is returned after the ground engineering such as foundations and the like is completed in the engineering construction, is generally backfilled within 5m and can be used for the engineering such as civil buildings, large foundation pits, pipe ditch backfill and the like.
Along with the continuous development of urbanization, the quantity of construction waste is gradually increased, and the recycling of the construction waste is gradually emphasized by people; therefore, the backfill soil for backfilling the building foundation pit and the pipe ditch can adopt the building waste as one of the raw materials, but the building waste can easily cause the surface of the sandstone material to generate micro cracks in the crushing process, and can easily remain partial mortar materials, so that the obtained regenerated waste can easily have higher water absorption; when the rainy season comes, the backfill soil is easy to sink or generate uneven settlement due to the large water absorption, so that potential safety hazards are easy to generate for construction buildings, and pipes in the pipe ditches are easy to be exposed to the external environment due to settlement loss of the backfill soil on the pipe ditches, so that the service lives of the pipes in the pipe ditches are influenced.
Therefore, how to prepare the backfill prepared by utilizing the construction waste has the advantage of difficult sinking or sedimentation even when contacting with rainwater in rainy season, and can be applied to the fields of foundation filling, pipe ditch backfilling and the like.
Disclosure of Invention
In order to prepare a backfill prepared by utilizing construction waste, the backfill still has the advantage of difficult sinking or settlement even if contacting with rainwater in rainy season, and can be applied to the fields of foundation filling, pipe ditch backfilling and the like, the application provides a regenerated backfill for buildings and a preparation process thereof.
In a first aspect, the present application provides a regenerative backfill soil for construction, which adopts the following technical scheme:
the regenerated backfill soil for the building comprises the following raw materials in parts by weight: 35-70 parts of regenerated backfill, 40-80 parts of natural sandstone, 4-10 parts of fly ash, 15-40 parts of calcium oxide, 2-8 parts of filler fiber and 5-15 parts of composite filler.
By adopting the technical scheme, the regenerated backfill material, the natural sandstone, the fly ash and the calcium oxide are matched, the water content in the backfill soil is reduced by utilizing the water absorption effect of the fly ash and the calcium oxide, the composite filler can be inserted into the internal gap of the backfill soil by matching with the filler fiber and the better filling effect and filling strength of the composite filler in the tamping process, the structural compactness of the backfill soil is improved, and the mechanical strength of the backfill soil is further improved by taking the filler fiber as a connecting bridge; even the rainwater erodes the backfill soil, the backfill soil still has better structural compactness, so that the backfill soil is not easy to sink or settle.
Preferably, the regenerated backfill material is prepared by crushing, cleaning, grading, drying and hydrophobic modification treatment of waste concrete blocks.
By adopting the technical scheme, after the waste concrete blocks are crushed, cleaned, graded and dried, residual mortar materials on the surfaces of the waste concrete blocks are removed, and then the waste concrete blocks are subjected to hydrophobic modification treatment, so that the prepared regenerated backfill material has a good hydrophobic effect, and the regenerated backfill material is prevented from absorbing water, thereby preventing the regenerated backfill soil from generating substantial settlement under the action of rainwater.
Preferably, the regenerated backfill consists of regenerated broken stone, regenerated sand and regenerated brick powder in a mass ratio of 1.
Through adopting above-mentioned technical scheme, regeneration rubble, regeneration sand, regeneration brick powder match and inject its proportion for regeneration backfill has better structural compactness and higher mechanical strength, not only is difficult for producing and subsides, can make the foundation structure have better bearing capacity moreover, improves the safety and stability of building.
Preferably, the filler fiber consists of polyacrylonitrile fiber, mullite fiber and hot-melt EVA liquid in a weight ratio of 1.5-1.5.
By adopting the technical scheme, the polyacrylonitrile fiber, the mullite fiber and the hot-melt EVA liquid are matched, and the better bonding effect of the hot-melt EVA liquid is utilized to improve the bonding effect among the filler fiber, the regenerated backfill and the composite filler, so that the filler fiber and the composite filler can be bonded on the surface of the regenerated backfill; in addition, the polyacrylonitrile fiber and the mullite fiber are matched with good elasticity and flexibility, and in the tamping process, the composite filler, the sandstone and the regenerated backfill material can realize vibration and movement by extruding the fiber, fill the pores in the backfill soil and improve the compactness of the internal structure of the backfill soil; meanwhile, the composite filler can circulate water, the polyacrylonitrile fiber and the mullite fiber can attract the water to guide the water on the fiber, and after the water enters the backfill soil, the transmission, the drainage and the guide effects of the water are utilized to further promote the rainwater to flow downwards out of the backfill soil to permeate underground; thereby the problem of large-scale sinking and sedimentation of the backfill soil is not easy to occur.
Preferably, the composite filler consists of modified porous silica gel particles and coated zeolite in a mass ratio of 1.2-0.8.
Through adopting above-mentioned technical scheme, modified porous silica gel granule, envelope zeolite, filler fiber cooperatees, utilize the better elasticity of porous silica gel granule, the resilience, tamp the in-process at the backfill, porous silica gel granule reaches the hole position department between fibre and the grit through the extrusion filler fiber, and the packing hole that resilience ability can be better after the porous silica gel granule is filled, and after the fibre kick-backs, make fibre, the grit material, porous silica gel granule forms compact network structure, further improve the closely knit degree of backfill, avoid the rainwater to make the backfill sink or subside as far as possible.
When rainwater enters the backfill soil, the porous structures of the modified porous silica gel particles and the zeolite are utilized to ensure that moisture is absorbed by the porous silica gel particles and the pores of the zeolite, so that the moisture is prevented from contacting other raw materials in the backfill soil as much as possible, and then the water absorption reversibility of the porous silica gel particles and the zeolite is utilized to ensure that the pore structures of the porous silica gel particles and the zeolite can realize the circulation of the moisture in the backfill soil and promote the moisture to flow underground from the top of the backfill soil; the water is further promoted to flow into the underground by matching with the diversion and gravitation effects of the filler fibers on the water, and the rapid water loss of the backfill soil at the bottom of the over-deep foundation pit or gully can be realized by reducing the retention time of rainwater in the backfill soil, so that the problem of sinking or settlement of the backfill soil is avoided as much as possible; meanwhile, the better hydrophobic effect of the surface of the regenerated backfill material is utilized to further avoid excessive water absorption of the backfill soil, so that the problem that the backfill soil is not easy to sink or settle to a large extent under the rainwater washing condition is solved.
Preferably, the modified porous silica gel particles are prepared by adsorbing coptis chinensis extract by porous silica gel particles.
By adopting the technical scheme, the porous silica gel particles and the coptis chinensis extract are matched, along with the attraction of the porous silica gel particles to rainwater, the moisture in the pores of the porous silica gel particles is gradually contacted with the coptis chinensis extract, the coptis chinensis extract is gradually driven to flow and migrate in the backfill soil by the moisture, and the microorganisms are not easily bred in the backfill soil by utilizing the good antibacterial effect of the coptis chinensis extract, so that the pipe in the pipe ditch is prevented from being corroded by the microorganisms as much as possible.
Preferably, the coated zeolite is prepared by adsorbing polyvinyl alcohol on zeolite and coating a polyvinyl alcohol film.
By adopting the technical scheme, the zeolite is matched with the polyvinyl alcohol, the polyvinyl alcohol is adsorbed and loaded by utilizing the pore structure of the zeolite, and the zeolite adsorbed with the polyvinyl alcohol is coated by adopting a polyvinyl alcohol film; after rainwater contacts the coated zeolite, the polyvinyl alcohol film on the surface of the coated zeolite is gradually destroyed along with the soaking of moisture as the polyvinyl alcohol film is gradually dissolved in water, so that polyvinyl alcohol loaded in pores of the zeolite is gradually contacted with the moisture, and the bonding compactness of the coated zeolite and other raw materials in backfill soil is further improved by using the bonding effect of the polyvinyl alcohol after the polyvinyl alcohol is dissolved in water; and the polyvinyl alcohol aqueous solution circulates in the backfill micro-gap, and the bonding compactness of the internal structure of the backfill is further improved by matching the communication effect of the pore structures of the modified porous silica gel particles and the zeolite and the drainage and flow guide effects of the filler fibers, so that the backfill has better mechanical property and is not easy to sink or settle to a large extent.
In a second aspect, the present application provides a preparation process of a recycled backfill soil for construction, which adopts the following technical scheme: a preparation process of regenerated backfill soil for construction comprises the following steps:
s1, weighing regenerated backfill and filler fiber, uniformly mixing, adding a composite filler, uniformly mixing, and drying to obtain a primary mixed material;
s2, weighing natural sandstone, fly ash and calcium oxide, and mixing and stirring uniformly with the primary mixed material to obtain a finished product.
By adopting the technical scheme, the regenerated backfill material, the composite filler and the filler fiber are matched, so that the filler fiber and the composite filler are bonded on the surface of the regenerated backfill material, then are matched with the natural sand stone, the fly ash and the calcium oxide, and the moisture content in the backfill soil is further reduced by utilizing the better water absorption effect of the fly ash and the calcium oxide, thereby avoiding the problem of sinking or settling of the backfill soil.
Preferably, in the step S1, the regenerated back filler is prepared by the following method:
weighing waste concrete blocks, and performing primary crushing, cleaning, screening, secondary crushing, cleaning, grading and drying to obtain a semi-finished product; and uniformly spraying hot-melt EVA liquid on the surface of the semi-finished product, wherein the mass ratio of the semi-finished product to the hot-melt EVA liquid is 1.1-0.35, drying, scattering, then placing in KH-570 for soaking treatment, taking out and drying to obtain the finished product regenerated backfill material.
By adopting the technical scheme, after the waste concrete blocks are subjected to secondary crushing and secondary cleaning, the mortar on the surfaces of the concrete blocks is removed, so that the semi-finished product is prevented from absorbing water as much as possible; the recycled crushed stone, recycled sand and recycled brick powder with different particle size requirements can be obtained after grading; the semi-finished product, the EVA liquid and the KH-570 are matched, the EVA liquid is bonded on the surface of the semi-finished product by utilizing the better bonding effect of the EVA liquid, and meanwhile, modified porous silica gel particles in the composite filler are further promoted to be bonded on the surface of the regenerated backfill material by utilizing the bonding coupling effect of the KH-570 and the EVA, so that the structural compactness of the backfill soil is improved, and the problem of large-degree sinking or settlement is not easy to occur in the backfill soil.
Preferably, the coated zeolite in the composite filler in S1 is prepared by the following method:
weighing nano polyvinyl alcohol particles according to the weight ratio of 1;
mixing the zeolite and the dispersion liquid according to the weight ratio of 1;
uniformly spraying a polyvinyl alcohol solution on the surface of the adsorbing material, wherein the mass ratio of the adsorbing material to the polyvinyl alcohol solution is 1.
By adopting the technical scheme, the nano polyvinyl alcohol particles are insoluble in ethanol, ultrasonic dispersion is utilized to be matched with the smaller particle size of the nano polyvinyl alcohol, the polyvinyl alcohol is promoted to be adsorbed in zeolite pores, and after drying, the ethanol is volatilized, so that the polyvinyl alcohol is loaded in the zeolite pores; then spraying polyvinyl alcohol solution, and forming a coating on the surface of the zeolite by utilizing the good bonding film forming effect of the polyvinyl alcohol; after the coated zeolite is contacted with rainwater, with the prolonging of rainfall time, a polyvinyl alcohol film on the surface of the coated zeolite is gradually dissolved, polyvinyl alcohol in pores of the zeolite is gradually contacted with moisture to form a solution with adhesive property, and the polyvinyl alcohol solution flows in backfill soil; meanwhile, the drainage effect of the fibers and the communication effect of the pores of the zeolite and the porous silica gel particles are matched, so that the polyvinyl alcohol solution flows in the backfill soil more uniformly, and after rainfall is finished, materials are bonded in the inner structure of the backfill soil by using the bonding film forming effect of the polyvinyl alcohol solution, so that the structural compactness of the backfill soil is improved, and the backfill soil is prevented from sinking or settling as much as possible.
In summary, the present application has the following beneficial effects:
1. the regenerated backfill material, the natural sandstone, the fly ash and the calcium oxide are matched, the water content in the backfill soil is reduced by utilizing the water absorption effect of the fly ash and the calcium oxide, the composite filler can be inserted into the gap inside the backfill soil by matching with the filler fiber and the better filling effect and filling strength of the composite filler in the tamping process, the structural compactness of the backfill soil is improved, the backfill soil is not easy to sink or settle, when the composite filler is applied to foundation filling or pipe ditch backfilling, the safety stability of a foundation can be ensured, the backfill soil above a pipe ditch is also not easy to lose, and the service life of pipes in the pipe ditch is ensured.
2. The regenerative backfill material, the filler fiber and the composite filler are matched, the KH-570 on the surface of the regenerative backfill material is utilized to improve the bonding effect of the modified porous silica gel particles in the regenerative backfill material and the composite filler and the coated zeolite, the hot-melt EVA liquid can promote the filler fiber to be bonded on the surface of the regenerative backfill material, and the hot-melt EVA liquid can promote the composite filler to be bonded on the surface of the regenerative backfill material, so that the bonding effect of the filler fiber and the composite filler on the surface of the regenerative backfill material is realized; through the better moisture circulation effect of composite packing, the better moisture drainage of cooperation filler fibre, water conservancy diversion effect to and the hydrophobic interaction on regeneration backfill surface, further avoid regeneration backfill excessively to absorb the rainwater, thereby avoid the backfill to produce and subside by a wide margin.
3. The regenerated backfill material, the filler fiber and the composite filler are matched, the better elasticity of the EVA in the filler fiber and the better elasticity of the EVA on the surface of the regenerated backfill material are matched with the better elasticity of the modified porous silica gel particles in the composite filler, the surface EVA is shrunk when the regenerated backfill material and the filler fiber are under pressure in the tamping process, and then the polyacrylonitrile fiber and the mullite fiber are flexibly bent, so that the coated zeolite and the modified porous silica gel are promoted to enter the internal pore structure of the backfill soil, and the modified porous silica gel can also elastically shrink when the position of the modified porous silica gel is moved, so that the modified porous silica gel is promoted to enter the pore structure, the structural compactness of the backfill soil is further improved, and the foundation has better bearing capacity.
4. Because the backfill soil at the bottom of the over-deep foundation pit or gully cannot be in direct contact with the outdoor environment, the moisture is not easy to dissipate after rainfall, and the backfill soil is easy to sink or settle if high pressure and high load are applied to the backfill soil; utilize modified porous silica gel granule, the diolame zeolite, filler fibre to cooperate, promote the rainwater to flow in the backfill through the pore structure in the modified porous silica gel granule, reduce the time that the rainwater stayed in the backfill, promote moisture rapid infiltration underground at the rainfall in-process, after the rain stops, utilize zeolite, the better ventilation effect of porous silica gel granule, further promote the evaporation of remaining moisture in the hole inside, further improve the structural compactness of backfill, make the backfill rainfall after difficult the appearance sink or the problem that subsides to a great extent still not easily.
5. The modified porous silica gel particles, the coated zeolite and the filler fibers are matched to form a communicated pore structure in the backfill soil, so that the coptis chinensis extract in pores of the modified porous silica gel particles is driven by moisture to be uniformly distributed in the backfill soil, the backfill soil has a uniform antibacterial effect, and the pipeline corrosion caused by microorganisms in the backfill soil is avoided as much as possible.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of regenerated backfill
Preparation example 1: the regenerated backfill is prepared by the following method:
i, weighing waste concrete blocks, and performing primary crushing, cleaning, screening, secondary crushing, cleaning, grading and drying to obtain a semi-finished product; the semi-finished product comprises regenerated broken stone, regenerated sand and regenerated brick powder, wherein the particle size of the regenerated broken stone is 5-10mm, the mud content is 0.3%, the void ratio is 42%, the crushing index is 8%, and the surface density is 2510kg/m 3 (ii) a The reclaimed sand has the grain diameter of 1-3mm, the fineness modulus of 2.1, the mud content of 1 percent, the void ratio of 42 percent and the surface density of 2460kg/m 3 (ii) a The particle size of the regenerated brick powder is 3-10mm, and the mud content is 2%;
II, uniformly spraying 0.2kg of hot-melt EVA (ethylene vinyl acetate) solution on the surface of 1kg of semi-finished product, drying, scattering until the semi-finished product is not adhered to each other, then placing the semi-finished product in KH-570 for soaking treatment, taking out after 5min, and finally drying to obtain a finished product regenerated backfill material; the regenerated backfill consists of regenerated macadam, regenerated sand and regenerated brick powder in a mass ratio of 1.
Preparation example 2: the difference between the preparation example and the preparation example 1 is that:
II, uniformly spraying 0.1kg of hot-melt EVA (ethylene vinyl acetate) solution on the surface of 1kg of semi-finished product, drying, scattering until the semi-finished product is not adhered to each other, then placing the semi-finished product in KH-570 for soaking treatment, taking out after 5min, and finally drying to obtain a finished product regenerated backfill material; the regenerated backfill consists of regenerated broken stone, regenerated sand and regenerated brick powder in a mass ratio of 1.
Preparation example 3: the difference between the preparation example and the preparation example 1 is that:
II, uniformly spraying 0.35kg of hot-melt EVA (ethylene vinyl acetate) solution on the surface of 1kg of semi-finished product, drying, scattering until the semi-finished product is not adhered to each other, then placing the semi-finished product in KH-570 for soaking treatment, taking out after 5min, and finally drying to obtain a finished product regenerated backfill material; the regenerated backfill consists of regenerated broken stones, regenerated sand and regenerated brick powder in a mass ratio of 1.
Preparation of Filler fiber
Preparation example 4: the filler fiber is prepared by the following method:
weighing 1kg of polyacrylonitrile fiber and 1kg of mullite fiber, uniformly mixing, and uniformly spraying 0.4kg of hot-melt EVA liquid to obtain a finished product, wherein the length of the polyacrylonitrile fiber is 5mm, and the length of the mullite fiber is 5mm.
Preparation example 5: the filler fiber is prepared by the following method:
weighing 1kg of polyacrylonitrile fiber and 0.5kg of mullite fiber, uniformly mixing, and uniformly spraying 0.2kg of hot-melt EVA liquid to obtain a finished product, wherein the length of the polyacrylonitrile fiber is 5mm, and the length of the mullite fiber is 5mm.
Preparation example 6: the filler fiber is prepared by the following method:
weighing 1kg of polyacrylonitrile fiber and 1.5kg of mullite fiber, uniformly mixing, and uniformly spraying 0.6kg of hot-melt EVA liquid to obtain a finished product, wherein the length of the polyacrylonitrile fiber is 5mm, and the length of the mullite fiber is 5mm.
Preparation example of modified porous silica gel particles
Preparation example 7: the modified porous silica gel particles are prepared by the following method:
extracting coptis chinensis by using absolute ethyl alcohol with the mass fraction of 99% to obtain coptis chinensis extracting solution with the mass fraction of 10%; putting 1kg of porous silica gel particles into 10kg of coptis root extract, wherein the particle size of the porous silica gel particles is 20 meshes, performing ultrasonic dispersion for 10min under the condition of 20kHz, and then drying until ethanol is completely volatilized to obtain a finished product.
Preparation of coated Zeolite
Preparation example 8: the coated zeolite is prepared by the following method:
weighing nano polyvinyl alcohol particles according to the weight ratio of 1;
mixing zeolite and the dispersion liquid according to a weight ratio of 1;
and uniformly spraying 0.25kg of polyvinyl alcohol solution on the surface of 1kg of the adsorbent, wherein the mass fraction of the polyvinyl alcohol solution is 1%, drying, and curing the polyvinyl alcohol solution into a polyvinyl alcohol film to obtain a finished product.
Preparation example 9: the coated zeolite is prepared by the following method:
weighing nano polyvinyl alcohol particles according to a weight ratio of 1;
mixing zeolite and the dispersion liquid according to a weight ratio of 1;
and uniformly spraying 0.1kg of polyvinyl alcohol solution on the surface of 1kg of the adsorbent, wherein the mass fraction of the polyvinyl alcohol solution is 1%, drying, and curing the polyvinyl alcohol solution into a polyvinyl alcohol film to obtain a finished product.
Preparation example 10: the coated zeolite is prepared by the following method:
weighing nano polyvinyl alcohol particles according to the weight ratio of 1;
mixing zeolite and the dispersion liquid according to a weight ratio of 1;
and uniformly spraying 0.4kg of polyvinyl alcohol solution on the surface of 1kg of the adsorbent, wherein the mass fraction of the polyvinyl alcohol solution is 1%, drying, and curing the polyvinyl alcohol solution into a polyvinyl alcohol film to obtain a finished product.
Examples
Example 1: a regenerated backfill soil for construction:
55kg of regenerated backfill, 60kg of natural sandstone, 7kg of fly ash, 30kg of calcium oxide, 5kg of filler fiber and 10kg of composite filler; the regenerated backfill prepared in the preparation example 1 is selected as the regenerated backfill; the natural sandstone has a particle diameter of 2-10mm, a fineness modulus of 2.9, a mud content of 3%, a mud mass of 0.8%, a porosity of 41%, and an apparent density of 2580kg/m 3 (ii) a The grade of the fly ash is F class II grade; the filler fiber prepared in preparation example 4 was used; the composite filler is composed of modified porous silica gel particles and coated zeolite in a mass ratio of 1; the coated zeolite prepared in preparation example 8 is selected;
the preparation process comprises the following steps:
s1, weighing filler fibers, adding the filler fibers into a regenerated backfill, uniformly mixing the regenerated backfill and the filler fibers, adding a composite filler, uniformly mixing the composite filler and the filler fibers, and drying to obtain a primary mixed material, wherein the adding speed of the composite filler is 5 g/S;
s2, weighing natural sandstone, fly ash and calcium oxide, and mixing and stirring uniformly with the primary mixed material to obtain a finished product.
Example 2: the present embodiment is different from embodiment 1 in that:
35kg of regenerated backfill, 80kg of natural sandstone, 10kg of fly ash, 15kg of calcium oxide, 2kg of filler fiber and 5kg of composite filler; the regenerated backfill prepared in the preparation example 2 is selected as the regenerated backfill; the filler fiber prepared in preparation example 5 was used; the composite filler is composed of modified porous silica gel particles and coated zeolite in a mass ratio of 1; the coated zeolite prepared in preparation example 9 was used.
Example 3: the present embodiment is different from embodiment 1 in that:
70kg of regenerated backfill, 40kg of natural sandstone, 4kg of fly ash, 40kg of calcium oxide, 8kg of filler fiber and 15kg of composite filler; the regenerated backfill prepared in preparation example 3 is selected as the regenerated backfill; the filler fiber prepared in preparation example 6 was used; the composite filler consists of modified porous silica gel particles and coated zeolite in a mass ratio of 1; the coated zeolite prepared in preparation example 10 was used.
Example 4: the present embodiment is different from embodiment 1 in that:
in the preparation process of the regenerated backfill material:
i, weighing waste concrete blocks, and performing primary crushing, cleaning, screening, secondary crushing, cleaning, grading and drying to obtain the finished product regenerated backfill.
Example 5: the present embodiment is different from embodiment 1 in that:
in the preparation process of the regenerated backfill material:
II, weighing the semi-finished product, soaking in KH-570 for 5min, taking out, and finally drying to obtain the regenerated backfill material of the finished product.
Example 6: the present embodiment is different from embodiment 1 in that:
the hot-melt EVA liquid is replaced by polyacrylonitrile fiber with the same mass in the filler fiber raw material.
Example 7: the present embodiment is different from embodiment 1 in that:
the modified porous silica gel particles are replaced by the porous silica gel particles with the same mass in the composite filler raw material.
Example 8: the present embodiment is different from embodiment 1 in that:
the composite filler material is prepared by replacing the coated zeolite with the same mass.
Example 9: the present embodiment is different from embodiment 1 in that:
the modified porous silica gel particles are replaced by natural sand with the same mass in the composite filler raw material.
Example 10: the present embodiment is different from embodiment 1 in that:
in the preparation process of the coated zeolite:
and uniformly spraying 0.25kg of ethyl cellulose solution on the surface of 1kg of zeolite, wherein the ethyl cellulose solution is ethyl cellulose ethanol solution, the mass fraction of the ethyl cellulose solution is 1%, drying, and solidifying the ethyl cellulose solution into an ethyl cellulose membrane to obtain a finished product.
Comparative example
Comparative example 1: this comparative example differs from example 1 in that:
no filler fiber was added to the raw materials.
Comparative example 2: this comparative example differs from example 1 in that:
the raw materials are not added with composite filler.
Performance test
1. Bearing capacity test
And (3) preparing the backfill by respectively adopting the preparation processes of the embodiments 1-10 and the comparative examples 1-2, and referring to GB50007-2002 foundation design specifications, the foundation depth is 5m, after the structure in the foundation is set, filling the backfill, detecting the bearing capacity of the backfill and recording data.
2. Sedimentation test
The preparation processes of the examples 1-10 and the comparative examples 1-2 are respectively adopted to prepare the finished backfill, the technical requirements of pipe ditch excavation and backfill are referenced, the pipe ditch depth is 4m, 1m of backfill is paved at the bottom of the pipe ditch, the diameter of a pipe is 1m, 2m of backfill is arranged above the pipe and is level to the surrounding ground, after tamping is finished, rainfall is carried out at the rainfall of 30mm/24h, after rainfall is carried out for 72h, the interval is 24h, and then the sedimentation height data is recorded.
3. Microbiological assay
The preparation processes of the embodiments 1 and 7 are respectively adopted to prepare the finished backfilled soil, the technical requirements of pipe ditch excavation and backfilling are referred, the pipe ditch depth is 4m, 1m of backfilled soil is paved at the bottom of the pipe ditch, the diameter of a pipe is 1m, the backfilled soil above the pipe is 2m and is level to the surrounding ground, after tamping is finished, rainfall is carried out at the rainfall of 10mm/12h, rainfall is carried out once every 15 days, ventilation is kept good, after 150 days, the original position of the backfilled soil is taken to detect the microbial content, and data is recorded.
TABLE 1 Performance test Table
As can be seen from the combination of examples 1 to 3 and table 1, the backfill prepared by the method has better bearing capacity, less subsidence under the rain condition and less microorganism content in the backfill after a period of time; the method is characterized in that regenerated backfill materials, natural sandstone, fly ash and calcium oxide are matched, the water absorption effect of the fly ash and the calcium oxide is utilized, the moisture content in backfill soil is reduced, the composite fillers can penetrate into gaps inside the backfill soil by matching the good elastic filling effect of the composite fillers in the tamping process, the structural compactness of the backfill soil is improved, meanwhile, the filler fibers are used as a support frame bridge, the strength of the backfill soil is further improved, the backfill soil is not prone to sedimentation under the rainwater condition, when the method is applied to foundation filling or pipe ditch backfilling, the safety and the stability of a foundation can be guaranteed, the backfill soil above a pipe ditch is not prone to loss, and the service life of pipes in the pipe ditch is guaranteed.
By combining example 1 with examples 4-10 and table 1, it can be seen that the hot-melt EVA solution and KH-570 are not treated in the preparation process of the regenerated backfill material of example 4, and the hot-melt EVA solution is not treated in the preparation process of the regenerated backfill material of example 5, compared with example 1, the backfill soil prepared by examples 4 and 5 has lower bearing capacity than example 1 and higher settling height than example 1; explaining the regenerated backfill material treated by hot-melt EVA liquid and KH-570, and utilizing the better elasticity of EVA to ensure that the regenerated backfill material has certain elastic performance, so that the filling fibers and the composite filler are promoted to fill the inner pores of the backfill soil in the tamping process, and the backfill soil is ensured to have better bearing capacity; and the better bonding effect of KH-570 and EVA is utilized to improve the adhesion effect of KH-570 on the surface of the regenerated backfill, and the better hydrophobic effect of KH-570 is utilized to ensure that the finished product regenerated backfill has better hydrophobic effect, so that the problem that the backfill is not easy to settle to a large extent under the rainwater washing condition because the semi-finished product absorbs rainwater is avoided as much as possible.
Example 6 a hot-melt EVA liquid is replaced with polyacrylonitrile fiber of the same mass in a filler fiber raw material, and compared with example 1, the backfill soil prepared in example 6 has a smaller bearing capacity than that in example 1 and a larger settling height than that in example 1; the matching of the polyacrylonitrile fiber, the hot-melt EVA liquid, the mullite fiber and the regenerated backfill material is illustrated, the adhesion of the polyacrylonitrile fiber and the mullite fiber on the surface of the regenerated backfill material is promoted by utilizing the viscosity of the hot-melt EVA liquid, the composite filler can be promoted to be adhered on the surface of the regenerated backfill material, and the structural density of the backfill soil is further improved, so that the backfill soil has higher bearing capacity; when rainwater enters the backfill soil, the composite filler is utilized to promote the water circulation effect, the polyacrylonitrile fiber and the mullite fiber are matched to the drainage effect of moisture, and the hydrophobic effect of the surface of the regenerated backfill material is utilized, so that the moisture is not easily adsorbed by the regenerated backfill material, and the backfill soil is not easy to sink and settle to a large extent under the rainwater washing condition.
Example 7 in the composite filler raw material, the modified porous silica gel particles are replaced by the porous silica gel particles with the same mass, compared with example 1, the backfill soil prepared in example 7 has the advantages that the bearing capacity is lower than that of example 1, the sedimentation height is higher than that of example 1, and the microorganism content is higher than that of example 1; the porous silica gel particles and the coptis chinensis extract are matched, when rainwater enters the porous silica gel particles, the coptis chinensis extract is easy to flow out gradually along with the rainwater, so that the coptis chinensis extract is volatilized and has an antibacterial effect in backfill soil, and the condition that microorganisms are bred in the backfill soil to influence the service life of a pipe in a pipe ditch is avoided as much as possible.
Example 8 the composite filler raw material is filled with zeolite of the same mass to replace the coated zeolite, compared with example 1, the backfill soil prepared by the example 8 has a lower bearing capacity than that of the example 1, and the settlement height is higher than that of the example 1; the method comprises the steps of loading polyvinyl alcohol on zeolite, coating the zeolite with polyvinyl alcohol, and after the coated zeolite is contacted with rainwater, gradually dissolving a polyvinyl alcohol film on the surface of the coated zeolite along with the extension of rainfall time, wherein the polyvinyl alcohol in pores of the zeolite is gradually contacted with water to form a viscous solution, the polyvinyl alcohol solution flows in backfill soil, and by utilizing the bonding film forming effect of the polyvinyl alcohol solution, various raw material substances can be bonded in the inner structure of the backfill soil, so that the structural compactness of the backfill soil after rainfall is improved, and the backfill soil is prevented from being greatly settled as far as possible.
Example 9 natural sand of the same mass is substituted for the modified porous silica gel particles in the composite filler raw material, compared with example 1, the backfill soil prepared in example 9 has a smaller bearing capacity than that of example 1, and a larger settling height than that of example 1; the modified porous silica gel particles are matched with EVA, the better elasticity of the modified porous silica gel particles is utilized, the structural compactness of the backfill soil is convenient to improve in the tamping process, the natural sand does not have the elasticity performance, so that the structural compactness in the backfill soil is easily influenced, the bearing capacity is influenced, and the settlement performance of the backfill soil is easily influenced because the pore structures without the porous silica gel particles are used as water flow channels in the rainfall process.
Example 10 in the preparation process of the coated zeolite, polyvinyl alcohol is not loaded in the pores of the zeolite, and the surface of the zeolite is coated with ethyl cellulose, compared with example 1, the backfill soil prepared in example 10 has a lower bearing capacity than that of example 1, and has a higher sedimentation height than that of example 1; the fact that the ethyl cellulose can be coated but cannot be dissolved and damaged under the impact of rainwater enables zeolite pores not to promote the water circulation in the backfill soil easily, and the settlement performance of the backfill soil is affected.
By combining the example 1 and the comparative examples 1-2 and combining the table 1, it can be seen that the raw material of the comparative example 1 is not added with the filler fiber, the raw material of the comparative example 2 is not added with the composite filler, compared with the example 1, the backfill soil prepared by the comparative examples 1 and 2 has the advantages that the bearing capacity is smaller than that of the example 1, and the sedimentation height is larger than that of the example 1; the matching of the filler fiber and the composite filler is proved to further improve the bearing capacity of the backfill soil, namely the mechanical property of the backfill soil is improved, and the problem that the backfill soil is not easy to generate large-scale settlement under the rainwater washing condition is solved.
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 regenerative backfill soil for the building is characterized by comprising the following raw materials in parts by weight: 35-70 parts of regenerated backfill, 40-80 parts of natural sandstone, 4-10 parts of fly ash, 15-40 parts of calcium oxide, 2-8 parts of filler fiber and 5-15 parts of composite filler.
2. The regenerative backfill for construction according to claim 1, characterized in that: the regenerated backfill is prepared by crushing, cleaning, grading, drying and hydrophobic modification treatment of waste concrete blocks.
3. The recycled backfill soil for construction according to claim 1, characterized in that the recycled backfill material consists of recycled crushed stone, recycled sand and recycled brick powder in a mass ratio of 1.
4. The recycled backfill soil for construction according to claim 1, wherein the filler fiber is composed of polyacrylonitrile fiber, mullite fiber and hot-melt EVA liquid in a weight ratio of 1.
5. The recycled backfill soil for construction according to claim 1, wherein the composite filler is composed of the modified porous silica gel particles and the coated zeolite in a mass ratio of 1.
6. The reclaimed backfill soil for construction according to claim 5, wherein the modified porous silica gel particles are prepared by adsorbing coptis chinensis extract on porous silica gel particles.
7. The reclaimed backfill soil for construction according to claim 5, wherein the coated zeolite is prepared by adsorbing polyvinyl alcohol on zeolite and coating a polyvinyl alcohol film.
8. The process for preparing the recycled backfill soil for construction according to any one of claims 1 to 7, characterized by comprising the following steps:
s1, weighing regenerated backfill and filler fiber, uniformly mixing, adding a composite filler, uniformly mixing, and drying to obtain a primary mixed material;
s2, weighing natural sandstone, fly ash and calcium oxide, and mixing and stirring uniformly with the primary mixed material to obtain a finished product.
9. The process for preparing the recycled backfill for the building according to claim 8, wherein in the step S1, the recycled backfill is prepared by adopting the following method:
weighing waste concrete blocks, and performing primary crushing, cleaning, screening, secondary crushing, cleaning, grading and drying to obtain a semi-finished product;
and (3) uniformly spraying hot-melt EVA liquid on the surface of the semi-finished product, wherein the mass ratio of the semi-finished product to the hot-melt EVA liquid is 1:0.1-0.35, drying, scattering, then placing in KH-570 for soaking treatment, taking out and drying to obtain the finished product regenerated backfill material.
10. The process for preparing the regenerated backfill soil for construction according to claim 8, wherein the coated zeolite in the composite filler in S1 is prepared by the following method:
weighing nano polyvinyl alcohol particles according to the weight ratio of 1;
mixing the zeolite and the dispersion liquid according to the weight ratio of 1;
uniformly spraying a polyvinyl alcohol solution on the surface of the adsorbing material, wherein the mass ratio of the adsorbing material to the polyvinyl alcohol solution is 1:0.1-0.4, and drying to obtain a finished product.
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Application publication date: 20221025 |