CN115124286A - Environment-friendly regenerated backfill material and preparation method thereof - Google Patents
Environment-friendly regenerated backfill material and preparation method thereof Download PDFInfo
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- CN115124286A CN115124286A CN202210710323.4A CN202210710323A CN115124286A CN 115124286 A CN115124286 A CN 115124286A CN 202210710323 A CN202210710323 A CN 202210710323A CN 115124286 A CN115124286 A CN 115124286A
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- 239000000463 material Substances 0.000 title claims abstract description 134
- 238000002360 preparation method Methods 0.000 title abstract description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 58
- 239000000654 additive Substances 0.000 claims abstract description 56
- 230000000996 additive effect Effects 0.000 claims abstract description 56
- 229920001661 Chitosan Polymers 0.000 claims abstract description 53
- 239000002689 soil Substances 0.000 claims abstract description 46
- 239000011159 matrix material Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 45
- 238000010276 construction Methods 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 41
- 239000002699 waste material Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 34
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 30
- 239000011777 magnesium Substances 0.000 claims abstract description 30
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 30
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 29
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 26
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 20
- 239000002440 industrial waste Substances 0.000 claims abstract description 19
- HZZOEADXZLYIHG-UHFFFAOYSA-N magnesiomagnesium Chemical compound [Mg][Mg] HZZOEADXZLYIHG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 24
- 239000000945 filler Substances 0.000 claims description 13
- 239000005416 organic matter Substances 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- 238000010030 laminating Methods 0.000 claims description 7
- 230000006196 deacetylation Effects 0.000 claims description 6
- 238000003381 deacetylation reaction Methods 0.000 claims description 6
- 239000002910 solid waste Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 229910052918 calcium silicate Inorganic materials 0.000 description 18
- 235000012241 calcium silicate Nutrition 0.000 description 18
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 17
- 229910001424 calcium ion Inorganic materials 0.000 description 17
- 230000000694 effects Effects 0.000 description 15
- 238000006703 hydration reaction Methods 0.000 description 15
- 239000000378 calcium silicate Substances 0.000 description 11
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 11
- 229910001385 heavy metal Inorganic materials 0.000 description 11
- 239000000377 silicon dioxide Substances 0.000 description 10
- 235000012239 silicon dioxide Nutrition 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 8
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 230000036571 hydration Effects 0.000 description 7
- 125000000524 functional group Chemical group 0.000 description 6
- 239000004927 clay Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 235000019976 tricalcium silicate Nutrition 0.000 description 3
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000007123 defense Effects 0.000 description 2
- 239000011381 foam concrete Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000004005 microsphere Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- PUAQLLVFLMYYJJ-UHFFFAOYSA-N 2-aminopropiophenone Chemical compound CC(N)C(=O)C1=CC=CC=C1 PUAQLLVFLMYYJJ-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
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
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/04—Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
-
- 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
- C04B24/38—Polysaccharides or derivatives thereof
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an environment-friendly regenerated backfill material, which comprises a matrix and an additive, wherein the matrix consists of cohesive soil, construction waste fine aggregate with the particle size of less than 5mm and water, and the additive consists of sodium carbonate, sodium silicate, magnesium slag obtained by silicothermic process magnesium smelting, cement, more than 75 industrial waste silica fume and chitosan; the invention also discloses a preparation method thereof: firstly, uniformly mixing magnesium-magnesium slag smelted by a silicothermic method after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5 mm; secondly, mixing sodium carbonate, sodium silicate, over 75 percent of industrial waste silica fume and chitosan evenly, and then mixing the two mixtures evenly; thirdly, adding water to obtain wet materials; and fourthly, entering a mold for maintenance. The invention adjusts the fluidity, the condensation time and the strength of the regenerated backfill material by controlling the composition and the content of the matrix, improves the strength and the density of the regenerated backfill material by controlling the composition and the content of the additive, avoids the volume shrinkage and realizes the resource recycling; the preparation method is simple, and the construction is convenient and quick.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an environment-friendly regenerated backfill material and a preparation method thereof.
Background
The backfill material for the building is a backfill material in the scenes of foundation pit fertilizer groove backfill, mineral goaf backfill, civil air defense engineering backfill and the like, and the traditional backfill materials comprise building ready-mixed mortar, lime soil layered backfill, foam concrete and the like. On one hand, the mineral goaf and the upper layer of the civil air defense project are capped, the premixed mortar has certain contractibility, is not easy to fill, has narrow interior and difficult manual operation, is not beneficial to machine tamping construction of lime-soil layered backfilling, and takes the subsequent development work into consideration, so that backfill materials with strong liquidity, adjustable curing time along with the working condition and adjustable strength along with the requirement are needed; on the other hand, the building foundation pit is continuously deepened, the foundation pit fertilizer groove is narrow and deep, the volume is large, the layered backfilling in the fertilizer groove is difficult to tamp, and the backfilling materials such as gravels and concrete with large self weight easily cause pressure to the foundation pit to cause engineering accidents, so the novel backfilling materials with small self weight, high strength and low shrinkage rate are needed, the workability (the fluidity and the setting time) of the novel backfilling materials can be adjusted along with the working condition, the traditional foam concrete backfilling materials have light self weight and adjustable workability, but the manufacturing cost is high, and connecting holes are easily formed among cells, and the novel backfilling materials cannot be applied to application scenes with requirements on impermeability.
Because the cohesive soil loess has certain collapsibility, the light low-strength concrete backfill taking the loess as the main component has volume contractibility, and causes adverse effects on the pouring of underground space, such as the phenomenon of underfilling, or volume contraction generated after water drenching, and poor backfilling effect. In addition, the backfill region has various landforms, and backfill materials with different condensation properties and fluidity are often required in the construction process along with the change of working conditions, so that higher requirements are provided for the performance of the backfill materials.
At present, the storage amount of the construction waste is huge, and the construction waste aggregate with the diameter of less than 5mm cannot meet the requirement of the mud content of the construction aggregate due to the high content of the powdery clay, so the construction waste aggregate cannot be directly used. In silty clay such as loess area, there is the direct building rubbish that utilizes as backfill, but often need utilize equipment to carry out repeated compaction, the cost is improved, and density is too big after the compaction, causes the ground to subside easily.
Meanwhile, with the expansion of the magnesium metal industry in China, the output of magnesium slag produced by silicothermic process is increased year by year, which causes certain harm to the environment and human health, and the resource recycling of the magnesium slag is urgent. Therefore, the application of the silicothermic smelting magnesium slag in the field of backfill materials is developed, and the problem of mass stockpiling of the magnesium slag can be effectively solved.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide an environment-friendly regenerated back filler for overcoming the defects of the prior art. Through the composition and the content of control base member in this environmental protection regeneration backfill material, the mobility of regeneration backfill material has effectively been adjusted, setting time and intensity, the dead weight is little, little to ground pressure, avoid subsiding, and can adjust setting time and adjust intensity according to the actual demand according to the operating mode, through the composition and the content of control additive, the intensity and the density of regeneration backfill material have been improved, the volume shrink has been avoided, the backfill effect has been improved, the resource recycle to construction site waste soil, building rubbish has been realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the environment-friendly regenerated backfill is characterized by comprising a matrix and an additive, wherein the additive is added into the matrix in a mass percentage of 1-20%, and the matrix consists of the following components in parts by mass: 10-90 parts of cohesive soil, 10-90 parts of construction waste fine aggregate with the particle size of less than 5mm and 20-40 parts of water, wherein the organic matter content of the cohesive soil is not more than 3%, the particle size of non-organic matter solid waste is not more than 50mm, and the additive comprises the following components in percentage by mass: 1-5% of sodium carbonate, 0-5% of sodium silicate, 42-75% of magnesium slag obtained by silicothermic process, 25-50% of cement, 0-7.5% of industrial waste silica fume with the weight of more than 75% and 0.01-0.5% of chitosan.
The composition of the environment-friendly regenerated backfill comprises a matrix and an additive, wherein cohesive soil and construction waste fine aggregates are used as main components of the matrix, the fluidity and the density of the matrix are effectively adjusted by adjusting the content of the components of the cohesive soil and the construction waste fine aggregates, so that the setting time and the strength of the regenerated backfill are adjusted, meanwhile, the construction waste fine aggregates with the particle size of less than 5mm contain more powdery clay to play a better bonding role, the matrix prepared from the construction waste fine aggregates with small particle size has lighter mass and smaller self weight, the prepared regenerated backfill has small pressure on a foundation, and engineering accidents caused by settlement are avoided; the chitosan in the additive is dissolved and then undergoes a complex reaction with calcium ions of dicalcium silicate and calcium oxide in the magnesium slag obtained by silicothermic process magnesium smelting, so that the dissolution of the calcium ions is promoted, the dissolved calcium ions react with carbonate ions in sodium carbonate to generate calcium carbonate and sodium hydroxide, the generation of the calcium carbonate improves the strength and compactness of the backfill material, the generation of microcracks is reduced, the volume shrinkage is avoided, the dimensional stability of the backfill material is ensured, the backfill effect is improved, the generated sodium hydroxide is beneficial to the dissolution of the calcium ions in the dicalcium silicate with lower hydration activity, and the sodium ions contained in the cohesive soil in the matrix are also beneficial to the improvement of the activity of dicalcium silicate in the magnesium slag and tricalcium silicate in cement, the dissolution of the calcium ions, the positive feedback effect is formed, and the backfill effect is further improved; meanwhile, sodium silicate in the additive reacts with dissolved calcium ions to generate silicon dioxide, sodium silicate and sodium hydroxide, the silicon dioxide reacts with the dissolved calcium ions to generate hydraulic calcium silicate hydrate, and the sodium hydroxide can activate the hydration activity of dicalcium silicate in magnesium slag and tricalcium silicate in cement, promote the hydration reaction to proceed, quickly shorten the setting time of the regenerated backfill material and improve the early strength of the regenerated backfill material. In addition, the silicon dioxide micro powder in the industrial waste silica fume of over 75 has high surface activity, is easy to be adsorbed with chitosan molecules and forms a coated chitosan film, and lone pair of N and O of the chitosan molecules on the film adsorbs calcium ions, so that the calcium ions are promoted to react with the silicon dioxide micro powder to form hydraulic calcium silicate hydrate, and the calcium ions are promoted to react with the generated silicon dioxide to form calcium silicate hydrate, thereby improving the strength of the regenerated backfill material; as the chitosan has large molecular weight and contains hydrogen bonds, chain folding is formed on the surfaces of the silicon dioxide micro powder and the silicon dioxide and the aluminum oxide in the clay, so that the generated hydrated calcium silicate is coated on the surface of the silicon dioxide micro powder to form microspheres, a reinforcing effect is exerted, the strength of the regenerated backfill material is further improved, and the backfill effect is improved.
The industrial waste silica fume with the purity of more than 75 in the invention refers to SiO 2 The mass content of the industrial waste silicon ash is more than 75 percent.
The environment-friendly regenerated backfill is characterized in that the additive is added into the matrix in a mass percentage of 20%, and the matrix comprises the following components in parts by mass: 90 parts of cohesive soil, 10 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the additive comprises the following components in percentage by mass: 5% of sodium carbonate, 3% of sodium silicate, 42.245% of magnesium slag produced by silicothermic process, 42.245% of cement, 7.5% of industrial waste silica fume with the weight of more than 75% and 0.01% of chitosan. The regenerated backfill material with the optimized composition has the advantages that the content of the cohesive soil in the matrix is increased, the content of the magnesium-magnesium slag smelted by the silicothermic process and the content of the chitosan in the additive are correspondingly reduced, and the content of the sodium carbonate, the sodium silicate, the cement and the industrial waste silica fume of over 75 in the additive is increased, so that the solidification time of the regenerated backfill material is shortened, the coagulation strength and the density of the regenerated backfill material are improved, and the regenerated backfill material with the advantages of quick solidification, high strength, light weight and low shrinkage is obtained.
The environment-friendly regenerated backfill is characterized in that the additive is added into the matrix in a mass percentage of 10%, and the matrix comprises the following components in parts by mass: 50 parts of cohesive soil, 50 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the additive comprises the following components in percentage by mass: 1% of sodium carbonate, 74.2125% of magnesium slag produced by silicothermic process, 24.7375% of cement and 0.5% of chitosan. The regenerated backfill material with the optimized composition improves the content of construction waste fine aggregate with the particle size of less than 5mm in a matrix, correspondingly improves the content of magnesium-magnesium slag and chitosan smelted by a silicothermic method in the additive, reduces the addition amount of sodium carbonate and cement, does not add sodium silicate and more than 75 industrial waste silica fume, reduces the quality of the regenerated backfill material, slows down the heat release process of hydration reaction, greatly improves the density of the regenerated backfill material, and obtains the regenerated backfill material with high fluidity and no shrinkage.
The environment-friendly regenerated back filling material is characterized in that the molecular formula of the chitosan contains-NH 2 -C ═ O and-OH functional groups, chitosan has a degree of deacetylation lower than 80%, a molecular weight higher than 5000, and is completely soluble in water at a pH higher than 10. the-NH group contained in the chitosan of the present invention 2 the-OH functional group can effectively capture and chelate heavy metal ions in heavy metal polluted soil, and simultaneously, the-C ═ O in the chitosan and Ca in the magnesium slag produced by the silicothermic method 2+ Forming a complex, and carrying out hydration reaction on dicalcium silicate in the magnesium slag obtained by silicothermic process magnesium smelting in the presence of water in the heavy metal contaminated soil to generate hydrated calcium silicate crystals, so that heavy metal ions enriched by chitosan in the complex are embedded into the hydrated calcium silicate crystals, and the enrichment and fixation of the heavy metal ions in the heavy metal contaminated soil are realized. The calcium silicate hydrate crystal is stable in performance and not easy to decompose or desorb, and the heavy metal ions are stably embedded in the calcium silicate hydrate crystal, isolated from the external environment and not influenced and difficult to release or dissolve out, so that the chitosan firmly adsorbs the heavy metal ions in the soil, and locks the heavy metal ions in the environment-friendly regenerated backfill curing process, thereby realizing the fixation and purification of the heavy metal ions in the soil.
In addition, the invention also provides a method for preparing the environment-friendly regenerated back filler, which is characterized by comprising the following steps:
step one, mixing magnesium-magnesium slag smelted by a silicothermic method after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5mm, and then stirring uniformly at a low speed to obtain a mixture A;
step two, uniformly mixing sodium carbonate, sodium silicate, industrial waste silica fume with the weight of more than 75 percent and chitosan to obtain a mixture B, and then adding the mixture B into the mixture A obtained in the step one to be uniformly stirred at a low speed to obtain a dry material of the regenerated backfill material;
step three, adding water into the dry material of the regenerated backfill material obtained in the step two, and uniformly stirring to prepare a wet material of the regenerated backfill material;
and step four, filling the wet material of the regenerated backfill material obtained in the step three into a mould by adopting a pumping or direct pouring mode, and laminating and maintaining to obtain the environment-friendly regenerated backfill material.
The invention adopts a method of stirring and mixing in sequence to prepare the wet material of the regenerated backfill material, and then adopts a pumping or direct pouring mode to enter a mold for maintenance to obtain the environment-friendly regenerated backfill material. The pumping mode is suitable for the regenerated backfill material containing a large amount of construction waste fine aggregate in the matrix, can be directly carried out in a treatment site of the construction waste fine aggregate, is convenient to obtain materials, saves the cost and is beneficial to the quality control of the regenerated backfill material; the direct pouring mode is suitable for the regenerated backfill material with a large amount of cohesive soil in the matrix, the cohesive soil can be directly dug in a construction site by adopting a stirrer for stirring preparation, and the method meets site conditions and construction requirements according to local conditions; the invention adopts film covering maintenance to avoid the influence of weather such as sun, rain and the like on the curing of the matrix, reduces the later-stage cracking caused by sudden increase or reduction of water quantity and ensures the quality of the environment-friendly regenerated backfill material.
The method is characterized in that the rotating speed for uniformly stirring at a low speed in the first step and the second step is 24.5r/min, and the time is 30 min.
The method is characterized in that the rotating speed for uniformly stirring in the third step is 45r/min, and the time is 20 min.
The low-speed stirring in the first step and the second step avoids the flying of the raw material powder, and reduces the loss; the rapid stirring in the third step ensures that the water and the dry materials of the regenerated backfill material are fully and uniformly stirred.
Compared with the prior art, the invention has the following advantages:
1. the environment-friendly regenerated backfill effectively adjusts the fluidity, the setting time and the strength of the regenerated backfill by controlling the composition and the content of the matrix, has small self weight, small pressure on a foundation, avoids sedimentation, can adjust the setting time according to the working condition and adjust the strength according to the actual requirement, improves the strength and the density of the regenerated backfill by controlling the composition and the content of the additive, avoids volume shrinkage and improves the backfill effect.
2. The calcium ions in the environment-friendly regenerated backfill material generate calcium carbonate and sodium hydroxide at the same time, so that the dissolution of the calcium ions in the dicalcium silicate with lower hydration activity is promoted, the sodium hydroxide generated by the reaction of the sodium silicate and the calcium ions in the additive activates the hydration activity of dicalcium silicate in magnesium slag and tricalcium silicate in cement, the hydration reaction is promoted to be carried out, the setting time of the regenerated backfill material is shortened rapidly, and the early strength of the regenerated backfill material is improved.
3. The silicon dioxide micropowder in the industrial waste silica fume of more than 75 adopted by the invention adsorbs chitosan and forms a chitosan film on the surface of the chitosan micropowder, thereby promoting the generation of hydraulic calcium silicate hydrate by calcium ions and improving the strength of regenerated backfill.
4. The invention adopts the clay, the construction waste and the magnesium slag smelted by the silicothermic method as the components of the environment-friendly regenerated backfill material, realizes the resource regeneration and utilization of the construction site waste soil and the construction waste, improves the resource utilization rate, and reduces the environmental pollution and the land occupation.
5. The environment-friendly regenerated backfill reduces water consumption by adding the additive, is easy to realize self-leveling and self-compacting, effectively adjusts the fluidity and the setting time of the backfill by adjusting the distribution ratio of the components in the additive, meets the requirements of different working conditions, and is suitable for backfill areas with various landforms.
6. The environment-friendly regenerated backfill material has 7d unconfined compressive strength of more than 0.5MPa and 28d unconfined compressive strength of more than 0.8MPa, meets the backfill requirements in practical application, and has high use value.
7. The chitosan adopted in the environment-friendly regenerated backfilling material has the functions of chelating and fixing heavy metal ions in soil, can be used in soil polluted to a certain extent, and plays a role in purifying the soil.
8. The preparation method of the environment-friendly regenerated backfill material is simple, convenient and rapid to construct, dry materials are prepared by mixing, the quality control of the regenerated backfill material is easy to perform by controlling the dry material mixing proportion, wet materials are prepared by adding water, the pouring position can be adjusted according to the working condition, and the environment-friendly regenerated backfill material is flexible and adaptable to various working conditions.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the environment-friendly recycled backfill prepared in the embodiment 1 of the invention.
FIG. 2 is a diagram showing an embodiment of the environmentally friendly recycled backfill prepared in comparative example 1 of the present invention.
Detailed Description
Example 1
The environment-friendly regenerated backfill material comprises a matrix and an additive, wherein the additive is added into the matrix in a mass percentage of 1%, and the matrix comprises the following components in parts by mass: 50 parts of cohesive soil, 50 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the organic matter content of the cohesive soil is not more than 3%, the particle size of non-organic solid waste is not more than 50mm, and the additive comprises the following components in percentage by mass: 1% of sodium carbonate, 74.2125% of magnesium slag produced by silicothermic process, 24.7375% of cement and 0.5% of chitosan;
the molecular formula of the chitosan has-NH 2 -C ═ O and-OH functional groups, chitosan has a degree of deacetylation lower than 80%, a molecular weight higher than 5000, and is completely soluble in water at a pH higher than 10.
The preparation method of the environment-friendly regenerated backfill material comprises the following steps:
step one, mixing the magnesium-magnesium slag smelted by the silicothermic process after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5mm, and then uniformly stirring at a low speed for 30min at the rotating speed of 24.5r/min to obtain a mixture A;
step two, uniformly mixing sodium carbonate, sodium silicate and chitosan to obtain a mixture B, then adding the mixture B into the mixture A obtained in the step one, and uniformly stirring at a slow speed for 30min at a rotating speed of 24.5r/min to obtain a dry material of the regenerated backfill;
step three, adding water into the dry material of the regenerated backfill material obtained in the step two, and uniformly stirring at the rotating speed of 45r/min for 20min to prepare a wet material of the regenerated backfill material;
and step four, filling the wet material of the regenerated backfill material obtained in the step three into a mould by adopting a direct pouring mode, and covering a film for curing to obtain the environment-friendly regenerated backfill material.
Comparative example 1
The comparative example differs from example 1 in that: no additive is added into the environment-friendly regenerated backfill material.
Fig. 1 is a diagram of an environment-friendly recycled filler prepared in example 1 of the present invention, and fig. 2 is a diagram of an environment-friendly recycled filler prepared in comparative example 1 of the present invention, and comparing fig. 1 with fig. 2, it can be known that the environment-friendly recycled filler without the additive is cured unevenly and has microcracks and generates shrinkage, the dimensional shrinkage rate is 1.2%, while the environment-friendly recycled filler with the additive is cured evenly and has no microcracks and is more compact, the dimensional stability is better, and the dimensional shrinkage rate is only 0.2%.
The wet materials of the environment-friendly regenerated backfill prepared in the embodiment 1 and the comparative example 1 are directly poured into cubes and coated with films for maintenance, wind and rain are avoided, the mold is removed after 24 hours for continuous maintenance, and the compressive strength is respectively measured for 7d and 28 d.
Example 2
The environment-friendly regenerated backfill material comprises a base body and an additive, wherein the additive is added into the base body in a mass percentage of 20%, and the base body comprises the following components in parts by mass: 90 parts of cohesive soil, 10 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the organic matter content of the cohesive soil is not more than 3%, the particle size of non-organic solid waste is not more than 50mm, and the additive comprises the following components in percentage by mass: 1% of sodium carbonate, 1% of sodium silicate, 48.995% of magnesium slag produced by silicothermic process, 48.995% of cement and 0.01% of chitosan;
the molecular formula of the chitosan has-NH 2 C ═ O and-OH functional groups, chitosan having a degree of deacetylation lower than 80%, molecular weight higher than 5000 and completely soluble in water having a pH higher than 10.
The preparation method of the environment-friendly regenerated backfill material comprises the following steps:
step one, mixing the magnesium-magnesium slag smelted by the silicothermic process after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5mm, and then uniformly stirring at a low speed for 30min at the rotating speed of 24.5r/min to obtain a mixture A;
step two, uniformly mixing sodium carbonate, sodium silicate and chitosan to obtain a mixture B, then adding the mixture B into the mixture A obtained in the step one, and uniformly stirring at a low speed for 30min at a rotating speed of 24.5r/min to obtain a dry material of the regenerated backfill;
step three, adding water into the dry material of the regenerated backfill material obtained in the step two, and uniformly stirring at the rotating speed of 45r/min for 20min to prepare a wet material of the regenerated backfill material;
step four, filling the wet material of the regenerated backfill material obtained in the step three into a mould by adopting a direct pouring mode, and laminating and maintaining to obtain the environment-friendly regenerated backfill material.
Example 3
The present embodiment is different from embodiment 2 in that: the weight percentage of the silicothermic magnesium-smelting slag in the additive is 58.794%, and the weight percentage of the cement is 39.196%.
Example 4
The present embodiment is different from embodiment 2 in that: the weight percentage of the silicothermic magnesium-smelting slag in the additive is 73.4925%, and the weight percentage of the cement is 24.4975%.
The wet materials of the regenerated backfill materials prepared in the examples 1-4 and the comparative example 1 of the invention are detected by fluidity and setting time; and (3) directly pouring the wet materials of the regenerated backfill materials into cubes, laminating and maintaining, avoiding wind and rain, removing the mold after 24 hours, continuing to maintain, and respectively measuring the compressive strength of 7d and 28d, wherein the results are shown in table 1.
TABLE 1
As can be seen from Table 1, the fluidity, the setting time and the compressive strength of the regenerated back filler prepared in the examples 1 to 4 of the invention are all superior to those of the regenerated back filler prepared in the comparative example 1 without adding the additive, which shows that the invention promotes the hydration reaction by adding the additive, shortens the setting time of the regenerated back filler and improves the strength of the regenerated back filler; meanwhile, as the content of the silicothermic process magnesium-smelting slag in the additive is increased, the fluidity of the regenerated backfill material is increased, the setting time is also increased, but the 7d compressive strength and the 28d compressive strength are both reduced, which shows that the increase of the content of the silicothermic process magnesium-smelting slag effectively improves the fluidity and the workability of the matrix, and the slow-hardening type cementing material beta-C in the silicothermic process magnesium-smelting slag 2 S and gamma-C with low hydration activity 2 S prolongs the hydration process, causes the 28d compressive strength of the regenerated backfill to be lower, but simultaneously causes the hydration to release heat slowly, reduces the thermal stress in the matrix and improves the dimensional stability.
Example 5
The environment-friendly regenerated backfill material comprises a matrix and an additive, wherein the additive is added into the matrix by mass percent of 20%, and the matrix consists of the following components in parts by mass: 90 parts of cohesive soil, 10 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the organic matter content of the cohesive soil is not more than 3%, the particle size of non-organic solid waste is not more than 50mm, and the additive comprises the following components in percentage by mass: 1% of sodium carbonate, 49.495% of magnesium slag produced by silicothermic process, 49.495% of cement and 0.01% of chitosan;
the molecular formula of the chitosan has-NH 2 -C ═ O and-OH functional groups, chitosan has a degree of deacetylation lower than 80%, a molecular weight higher than 5000, and is completely soluble in water at a pH higher than 10.
The preparation method of the environment-friendly regenerated backfill material comprises the following steps:
step one, mixing the magnesium-magnesium slag smelted by the silicothermic process after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5mm, and then uniformly stirring at a low speed for 30min at the rotating speed of 24.5r/min to obtain a mixture A;
step two, uniformly mixing sodium carbonate and chitosan to obtain a mixture B, then adding the mixture B into the mixture A obtained in the step one, and uniformly stirring at a slow speed for 30min at a rotating speed of 24.5r/min to obtain a dry material of the regenerated backfill material;
step three, adding water into the dry material of the regenerated backfill material obtained in the step two, and uniformly stirring at the rotating speed of 45r/min for 20min to prepare a wet material of the regenerated backfill material;
step four, filling the wet material of the regenerated backfill material obtained in the step three into a mould by adopting a pumping mode, and laminating and maintaining to obtain the environment-friendly regenerated backfill material.
Example 6
The present embodiment differs from embodiment 5 in that: the additive comprises the following components in percentage by mass: 1% of sodium carbonate, 1% of sodium silicate, 48.99% of magnesium slag produced by silicothermic process, 48.99% of cement and 0.02% of chitosan.
Example 7
The present embodiment differs from embodiment 5 in that: the additive comprises the following components in percentage by mass: 3% of sodium carbonate, 3% of sodium silicate, 46.875% of magnesium slag produced by silicothermic process, 46.875% of cement and 0.25% of chitosan.
Example 8
The present embodiment differs from embodiment 5 in that: the additive comprises the following components in percentage by mass: 3% of sodium carbonate, 3% of sodium silicate, 46.875% of magnesium slag produced by silicothermic process, 46.875% of cement and 0.5% of chitosan.
Example 9
The present embodiment differs from embodiment 5 in that: the additive comprises the following components in percentage by mass: 5% of sodium carbonate, 3% of sodium silicate, 45.75% of magnesium slag obtained by silicothermic process, 45.75% of cement, 4% of industrial waste silica fume with the concentration of over 75% and 0.5% of chitosan.
Example 10
The present embodiment differs from embodiment 5 in that: the additive comprises the following components in percentage by mass: 5% of sodium carbonate, 3% of sodium silicate, 42.245% of magnesium slag produced by silicothermic process, 42.245% of cement, 7.5% of industrial waste silica fume with the weight of more than 75% and 0.01% of chitosan.
The wet materials of the regenerated backfill prepared in the embodiments 5-10 of the invention are detected by fluidity and setting time; and (3) directly pouring the wet material of each regenerated backfill material into a cube, coating a film for maintenance, avoiding wind and rain, removing the mold after 24 hours, continuously maintaining, and respectively measuring the compressive strength of 7d and 28d, wherein the results are shown in table 2.
TABLE 2
As can be seen from table 2, in examples 5 to 10 of the present invention, as the mixing ratio of sodium carbonate, sodium silicate, chitosan and silica fume in the regenerated backfill additive is changed, the fluidity and the setting time of the regenerated backfill are also changed, and as the mixing ratio of sodium carbonate, sodium silicate, chitosan and silica fume is increased, the 7d compressive strength and the 28d compressive strength of the environmentally friendly regenerated backfill are both increased, which indicates that the strength of the regenerated backfill is improved by the reaction of sodium carbonate and calcium ions to generate calcium carbonate, the hydration reaction is promoted by the reaction of sodium silicate and calcium ions to generate hydraulic calcium silicate hydrate, the setting time of the regenerated backfill is shortened and the early strength is improved, the strength of the regenerated backfill is improved by the fact that silica in more than 75 industrial waste silica fume is coated on chitosan and reacts with calcium ions to generate calcium silicate hydrate, the chitosan forms chain folding to form microspheres to be filled in the matrix, the strength of the regenerated backfill is further improved, and the compressive strength of the regenerated backfill is obviously improved under the combined action of the components in the additive.
Example 11
The environment-friendly regenerated backfill material comprises a matrix and an additive, wherein the additive is added into the matrix in a mass percentage of 10%, and the matrix comprises the following components in parts by mass: 50 parts of cohesive soil, 50 parts of construction waste fine aggregate with the particle size of less than 5mm and 20 parts of water, wherein the organic matter content of the cohesive soil is not more than 3%, the particle size of non-organic solid waste is not more than 50mm, and the additive comprises the following components in percentage by mass: 5% of sodium carbonate, 5% of sodium silicate, 42.75% of magnesium slag produced by silicothermic process, 42.75% of cement, 4% of industrial waste silica fume with the concentration of over 75% and 0.5% of chitosan;
the molecular formula of the chitosan has-NH 2 -C ═ O and-OH functional groups, chitosan has a degree of deacetylation lower than 80%, a molecular weight higher than 5000, and is completely soluble in water at a pH higher than 10.
The preparation method of the environment-friendly regenerated backfill material comprises the following steps:
step one, mixing the magnesium-magnesium slag smelted by the silicothermic process after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5mm, and then uniformly stirring at a low speed for 30min at the rotating speed of 24.5r/min to obtain a mixture A;
step two, uniformly mixing sodium carbonate, sodium silicate, more than 75 of industrial waste silica fume and chitosan to obtain a mixture B, then adding the mixture B into the mixture A obtained in the step one, and uniformly stirring at a low speed, wherein the adopted rotating speed is 24.5r/min, and the time is 30min to obtain a dry material of the regenerated backfill material;
step three, adding water into the dry material of the regenerated backfill material obtained in the step two, and uniformly stirring at the rotating speed of 45r/min for 20min to prepare a wet material of the regenerated backfill material;
step four, filling the wet material of the regenerated backfill material obtained in the step three into a mould by adopting a direct pouring mode, and laminating and maintaining to obtain the environment-friendly regenerated backfill material.
Example 12
The present embodiment differs from embodiment 11 in that: the matrix comprises the following components in parts by mass: 50 parts of cohesive soil, 50 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water.
Example 13
The present embodiment differs from embodiment 11 in that: the matrix comprises the following components in parts by mass: 50 parts of cohesive soil, 50 parts of construction waste fine aggregate with the particle size of less than 5mm and 40 parts of water.
Example 14
The present embodiment differs from embodiment 11 in that: the matrix comprises the following components in parts by mass: 10 parts of cohesive soil, 90 parts of construction waste fine aggregate with the particle size of less than 5mm and 20 parts of water.
The wet materials of the regenerated backfill prepared in the embodiments 11 to 14 of the invention are detected by fluidity and setting time; and directly pouring the wet materials of the backfilling materials into cubes, laminating and maintaining, avoiding wind and rain, removing the mold after 24 hours, continuing to maintain, and respectively measuring the compressive strength of 7d and 28d, wherein the results are shown in Table 3.
TABLE 3
As can be seen from table 3, in examples 11 to 14 of the present invention, as the water-solid ratio in the matrix increases, the fluidity of the regenerated backfill increases and the setting time also increases, but the 7d compressive strength and the 28d compressive strength are both lower, which indicates that the presence of free water in the regenerated backfill increases the inter-particle distance between the matrix and the additive, so that the hydration reaction does not easily occur, the strength of the regenerated backfill increases slowly, and as the content of free water increases, the proportion of dry materials decreases, the amount of each raw material participating in the hydration reaction decreases, and the strength of the regenerated backfill further decreases.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (7)
1. The environment-friendly regenerated backfill is characterized by comprising a matrix and an additive, wherein the additive is added into the matrix in a mass percentage of 1-20%, and the matrix consists of the following components in parts by mass: 10-90 parts of cohesive soil, 10-90 parts of construction waste fine aggregate with the particle size of less than 5mm and 20-40 parts of water, wherein the organic matter content of the cohesive soil is not more than 3%, the particle size of non-organic matter solid waste is not more than 50mm, and the additive comprises the following components in percentage by mass: 1-5% of sodium carbonate, 0-5% of sodium silicate, 42-75% of magnesium slag obtained by silicothermic process, 25-50% of cement, 0-7.5% of industrial waste silica fume with the weight of more than 75% and 0.01-0.5% of chitosan.
2. The environment-friendly regenerated back filler according to claim 1, wherein the additive is added into the matrix in a mass percentage of 20%, and the matrix comprises the following components in parts by mass: 90 parts of cohesive soil, 10 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the additive comprises the following components in percentage by mass: 5% of sodium carbonate, 3% of sodium silicate, 42.245% of magnesium slag produced by silicothermic process, 42.245% of cement, 7.5% of industrial waste silica fume with the weight of more than 75% and 0.01% of chitosan.
3. The environment-friendly regenerated back filler according to claim 1, characterized in that the additive is added to the matrix in a mass percentage of 10%, and the matrix consists of the following components in parts by mass: 50 parts of cohesive soil, 50 parts of construction waste fine aggregate with the particle size of less than 5mm and 30 parts of water, wherein the additive comprises the following components in percentage by mass: 1% of sodium carbonate, 74.2125% of magnesium slag produced by silicothermic process, 24.7375% of cement and 0.5% of chitosan.
4. The environment-friendly regenerated back filler as claimed in claim 1, wherein the chitosan has-NH in its molecular formula 2 、-CChitosan has a degree of deacetylation of less than 80%, a molecular weight of greater than 5000, and is completely soluble in water at a pH greater than 10.
5. A method for preparing the environmentally friendly recycled backfill according to any one of claims 1-4, characterized by the following steps:
step one, mixing magnesium-magnesium slag smelted by a silicothermic method after natural air cooling, cement, cohesive soil and construction waste fine aggregate with the particle size of less than 5mm, and then stirring uniformly at a low speed to obtain a mixture A;
step two, uniformly mixing sodium carbonate, sodium silicate, industrial waste silica fume with the weight of more than 75 percent and chitosan to obtain a mixture B, and then adding the mixture B into the mixture A obtained in the step one to be uniformly stirred at a low speed to obtain a dry material of the regenerated backfill material;
step three, adding water into the dry material of the regenerated backfill material obtained in the step two, and uniformly stirring to prepare a wet material of the regenerated backfill material;
and step four, filling the wet material of the regenerated backfill material obtained in the step three into a mould by adopting a pumping or direct pouring mode, and laminating and maintaining to obtain the environment-friendly regenerated backfill material.
6. The method of claim 5, wherein the slow stirring in the first and second steps is carried out at a rotation speed of 24.5r/min for 30 min.
7. The method as claimed in claim 5, wherein the stirring in step three is carried out at a rotation speed of 45r/min for 20 min.
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