CN113149589A - Soil body curing agent doped with sludge incineration ash and preparation method thereof - Google Patents
Soil body curing agent doped with sludge incineration ash and preparation method thereof Download PDFInfo
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- CN113149589A CN113149589A CN202110449461.7A CN202110449461A CN113149589A CN 113149589 A CN113149589 A CN 113149589A CN 202110449461 A CN202110449461 A CN 202110449461A CN 113149589 A CN113149589 A CN 113149589A
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- sludge incineration
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- 239000002689 soil Substances 0.000 title claims abstract description 82
- 239000010802 sludge Substances 0.000 title claims abstract description 79
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims description 6
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 52
- 239000010440 gypsum Substances 0.000 claims abstract description 51
- 239000004568 cement Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000002956 ash Substances 0.000 claims description 73
- 238000002156 mixing Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 12
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- 239000010936 titanium Substances 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- 239000010865 sewage Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000000498 ball milling Methods 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
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- 239000000428 dust Substances 0.000 claims description 3
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- 239000002910 solid waste Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
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- 238000011161 development Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 15
- 239000006227 byproduct Substances 0.000 description 15
- 229910052593 corundum Inorganic materials 0.000 description 15
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- 229910052681 coesite Inorganic materials 0.000 description 9
- 229910052906 cristobalite Inorganic materials 0.000 description 9
- 239000000377 silicon dioxide Substances 0.000 description 9
- 229910052682 stishovite Inorganic materials 0.000 description 9
- 229910052905 tridymite Inorganic materials 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 5
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- 238000006703 hydration reaction Methods 0.000 description 5
- 238000012216 screening Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 150000001804 chlorine Chemical class 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 229910001385 heavy metal Inorganic materials 0.000 description 3
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- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
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- 238000006386 neutralization reaction Methods 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 231100000820 toxicity test Toxicity 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 229910052595 hematite Inorganic materials 0.000 description 1
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- 238000003837 high-temperature calcination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate 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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a soil body curing agent doped with sludge incineration ash, which comprises the following materials in parts by weight: 0-30% of sludge incineration ash, 5-10% of gypsum, 40-55% of slag powder and 20-30% of cement; when the curing agent is used for reinforcing a high soft soil foundation, the using amount ratio of the curing agent to soft soil is 10-30%; when the curing agent is used for reinforcing the roadbed, the using amount ratio of the curing agent to soil is 4-15%. The soil body curing agent doped with the sludge incineration ash provided by the invention adopts various solid wastes in a synergistic compatibility, utilizes chloride and sulfate components in the sludge incineration ash as an excitant to provide strength for a soil body, is an environment-friendly curing agent integrating multiple solid wastes, and has lower manufacturing cost than cement on the premise of achieving the same curing effect as the cement; in addition, the development of the soil body curing agent finds a way for disposal and utilization of sludge incineration ash, and can simultaneously absorb various solid wastes, thereby realizing resource and energy conservation and development of waste-utilizing new materials.
Description
Technical Field
The invention relates to the technical field of curing agents, in particular to a soil body curing agent doped with sludge incineration ash and a preparation method thereof.
Background
The mixing pile technology (wet method and dry method) is a common method for reinforcing soft soil foundation before underground engineering foundation pit excavation, and curing agent is generally sprayed by adopting construction processes such as deep mixing method, high-pressure injection grouting method and the like, so that the curing agent reacts with the soft soil to form a temporary mixing pile retaining water stop wall with higher strength. At present, most of stirring pile curing agents used in engineering are mainly cement, and because the cement has high strength and stable performance, the cement becomes one of the most main soft soil foundation treatment technologies in China. However, high-temperature calcination is required in the cement production process, and a large amount of carbon dioxide is released, and according to calculation, about 597kg of carbon dioxide is generated for each ton of cement produced, and the emission of excessive carbon dioxide causes global warming, so that the greenhouse effect is serious.
Urban sewage and sludge treatment is an important civil engineering for ensuring stable operation of cities, and the expected sludge production amount in China in 2023 is 9772 ten thousand tons. The drying incineration not only can greatly reduce the volume of the sludge, but also has the advantages of high treatment speed, pathogen killing and the like, and becomes the mainstream mode for treating the sludge at present. With the rapid growth of urban sewage and sludge and the increasing amount of sludge incineration ash, according to research and research, only in the Shanghai city, the output of sludge incineration ash is estimated to break through millions of tons in 5 years, because the landfill capacity of land is nearly saturated, the resource utilization of sludge incineration ash is urgent, a way for the disposal and utilization of sludge incineration ash needs to be found urgently, under the great situation that the carbon emission peak is achieved in 10 years and the carbon neutralization is achieved in 40 years in China, the building industry is used as the field with the largest cement consumption, the use of cement products is effectively reduced, the low-carbon development is promoted, and the important significance is achieved for achieving the carbon peak and carbon neutralization targets. In combination with the above description, the invention provides a soil body curing agent doped with sludge incineration ash.
Disclosure of Invention
The invention aims to provide a soil body curing agent doped with sludge incineration ash, which adopts the synergistic compatibility of various solid wastes and utilizes chloride and sulfate components in the sludge incineration ash as an excitant to provide strength for a soil body; the curing agent provided by the invention is an environment-friendly curing agent integrating multiple solid wastes, has lower manufacturing cost than cement on the premise of achieving the same curing effect as the cement, and in addition, the development of the soil body curing agent also finds a way for the disposal and utilization of sludge incineration ash, and can simultaneously absorb multiple solid wastes, thereby realizing the resource and energy conservation and the development of waste-utilizing new materials.
The invention adopts the following technical scheme to solve the technical problems:
a soil body curing agent doped with sludge incineration ash comprises the following materials in parts by weight: 0-30% of sludge incineration ash, 5-10% of gypsum, 40-55% of slag powder and 20-30% of cement.
Further, the sludge incineration ash refers to dust collected after domestic sewage and sludge incineration treatment, and the sludge incineration temperature is 450-1000 ℃.
Further, the gypsum comprises one or more of desulfurized gypsum, fluorgypsum, titanium gypsum, phosphogypsum and dry sintering desulfurized ash.
Furthermore, the content of the calcium sulfate dihydrate of the gypsum is more than or equal to 75%, weak acid or weak base substances are used as a pH regulator for regulation, and the pH of the regulated gypsum is 6-12.
Further, the addition amount of the pH regulator is 0-1% of that of the gypsum.
Further, the pH regulator comprises one or more of phosphate, calcium hydroxide and ammonia water.
Further, when the curing agent is used for reinforcing the high soft soil foundation, the dosage ratio of the curing agent to the soft soil is 10-30%.
Further, when the curing agent is used for reinforcing a high-soft soil foundation, the using amount ratio of the curing agent to soft soil is 12-20%.
Further, when the curing agent is used for reinforcing the roadbed, the using amount ratio of the curing agent to soil is 4-15%.
Further, when the curing agent is used for reinforcing the roadbed, the using amount ratio of the curing agent to soil is 6-10%.
The preparation method of the soil body curing agent doped with the sludge incineration ash comprises the following steps: performing ball milling treatment on sludge incineration ash, and adjusting the pH value of gypsum to 6-12 by using a pH regulator; and weighing the sludge incineration ash, gypsum, slag powder and cement in proportion, and mixing to obtain the soil body curing agent doped with the sludge incineration ash.
Further, the ball milling time of the sludge incineration ash is 5-20 min.
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
the invention adopts the synergistic compatibility of various solid wastes, and utilizes the chlorine salt and sulfate components in the sludge incineration ash as an excitant to provide strength for the soil body; wherein the main chemical component of the industrial byproduct gypsum in the raw materials is calcium sulfate (CaSO)4) Slag powder is a waste material in the steel industry, and its chemical composition is mainly SiO2、Al2O3CaO, the sludge incineration ash is a product obtained by drying and incinerating sludge, and the chemical component of the sludge incineration ash is SiO2、Al2O3Mainly, the mineral composition comprises quartz (SiO)2) Hematite (Fe)2O3) And phosphate and other substances, the components are similar to mineral materials such as fly ash and the like, and the material has potential gelling activity; in addition, when sewage is treated by a sewage treatment plant, a flocculant is required to be added to achieve the effect of separating mud from water, common flocculants comprise aluminum sulfate, polyaluminium chloride, aluminum chloride and the like, sulfate and chloride salt components still exist in sludge incineration ash after high-temperature incineration, and the curing effect can be effectively enhanced by utilizing chloride salt excitation and sulfate co-excitation;
wherein, the chlorine salt excitation uses the chlorine salt in the incineration ash as an exciting agent, under the alkaline environment, hydrated chloroaluminate is formed, and the chlorine salt can penetrate through a hydration layer on the surface of incineration ash particles and active Al in the incineration ash particles due to strong Cl-diffusion capacity2O3Or Al in slag powder2O3The hydrated calcium aluminate is generated by the reaction, so that the hydration process is promoted, and the soil solidification strength is provided; the sulfate co-excitation is sulfur in incineration ash of gypsum and sludgeAcid salt component (CaSO)4And Al2(SO4)3) Under the combined action, the active SiO on the surface of the slag powder particles2Produce hydration reaction to produce CSH gel and active Al2O3Hydration reaction is generated to generate ettringite, and the ettringite provides the strength for soil solidification;
in addition, compared with the prior art, the invention can reduce 70-80% of carbon dioxide emission and save 10-30% of cost on the premise of achieving the same curing effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a graph comparing the compressive strengths of different groups in example 1 of the present invention;
FIG. 2 is a graph of the compressive strength of the example 2 of the present invention with different amounts of the curing agent;
FIG. 3 is a graph showing the compressive strength of the steel in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples. The technical means used in the following examples are conventional means well known to those skilled in the art, and all raw materials are general-purpose materials.
The invention relates to a soil body curing agent doped with sludge incineration ash, which comprises the following materials in parts by weight: 0-30% of sludge incineration ash, 5-10% of gypsum, 40-55% of slag powder and 20-30% of cement.
Wherein the sludge incineration ash refers to dust collected after domestic sewage and sludge incineration treatment, and the sludge incineration temperature is 450-1000 ℃; the gypsum comprises one or more of desulfurized gypsum, fluorgypsum, titanium gypsum, phosphogypsum and dry sintering desulfurized ash; the content of calcium sulfate dihydrate of the gypsum is more than or equal to 75%, weak acid or weak base substances are used as a pH regulator for regulation, the pH of the regulated gypsum is 6-12, and the addition amount of the pH regulator is 0-1% of that of the gypsum.
Wherein the pH regulator comprises one or more of phosphate, calcium hydroxide and ammonia water.
When the curing agent is used for reinforcing a high soft soil foundation, the using amount ratio of the curing agent to soft soil is 10-30%; further, when the curing agent is used for reinforcing the roadbed, the using amount ratio of the curing agent to soil is 4-15%.
The preparation method of the soil body curing agent doped with the sludge incineration ash comprises the following steps: performing ball milling treatment on sludge incineration ash for 5-20 min to ensure that the fineness of the sludge incineration ash meets the requirement of grade III fly ash specified in the national standard fly ash for cement and concrete (GB/T1596); adjusting the pH value of the gypsum to 6-12 by using a pH regulator; and weighing the sludge incineration ash, gypsum, slag powder and cement in proportion, and mixing to obtain the soil body curing agent doped with the sludge incineration ash.
The invention is further illustrated by the following specific examples:
example 1
PO42.5 cement, S95 slag powder, industrial byproduct gypsum and sludge incineration ash are used as raw materials, and the materials are mixed according to the table 1, wherein the industrial byproduct gypsum comprises sintering dry-method desulfurization ash, phosphogypsum and titanium gypsum, and the industrial byproduct gypsum is converted into the proportion of a dry basis.
In this example, the silt soil was reinforced with the curing agent, the mixing amount of the curing agent was 12%, and the water-to-gel ratio (i.e., the percentage of water in the total amount of the curing agent and the silt soil) was 0.5.
The 7d unconfined compressive strength and the 28d unconfined compressive strength are tested according to the unconfined compressive strength test method B.2 in JGJ/T233-; the test results were as follows:
table 1: mixing proportion (%) of curing agent doped with sludge incineration ash and reinforced soil test and unconfined compressive strength of soil body
Table 2: heavy metal leachate toxicity test of curing agent-reinforced soil doped sludge incineration ash
As can be seen from Table 1 and FIG. 1, the early strength and the later strength of the soil body are improved by blending the industrial byproduct gypsum with the sludge incineration ash, which shows that the two solid wastes have synergistic effect, and the strength of the soil body can be provided by blending the industrial byproduct gypsum with the sludge incineration ash, and is superior to that of a pure cement system.
The system formed by compounding the industrial byproduct gypsum and the incineration ash can excite the active SiO in the slag powder2And active Al2O3To form C-S-H and C-A-H gels, and CaSO4After being dissolved, the calcium can further react with C-A-H to generate ettringite, so that the gel strength is improved; when the soil body is solidified, 32 parts of crystal water ettringite can be formed in the complex-doped gelling system 3d, free water in the clay is converted into crystal water, and in addition, hydration products are continuously generated at the later stage, so that higher reinforced soil strength can be formed.
As can be seen from Table 2, several groups of the incineration ash residues are selected for the toxicity test of the heavy metal leachate, and all the groups meet the standard requirements.
Example 2
In the embodiment, the soil body curing agent doped with sludge incineration ash is used for reinforcing a soft foundation, and the concrete steps are as follows:
(1) performing ball milling pretreatment on sludge incineration ash, and then performing sieving according to a 45-micron negative pressure sieving method in GB/T1345 for 3min to obtain the sludge incineration ash with the fineness of 11.2%;
wherein, the negative pressure screening method in GB/T1345 comprises the following steps: before the screen analysis test, a 45-micron negative pressure screen is placed on a screen seat, a screen cover is covered, a power supply is switched on, a control system is checked, and the negative pressure is adjusted to be in the range of 4000 Pa-6000 Pa; weighing the sample to 0.01g, placing in a clean negative pressure sieve, placing on a sieve seat, covering a sieve cover, switching on a power supply, starting a sieve analyzer to continuously sieve for 3min, and slightly knocking the sieve cover to make the sample fall down if the sample is attached to the sieve cover in the period. After the screening, the whole screen residue was weighed with balance.
(2) Weighing sludge incineration ash, industrial byproduct gypsum, slag powder and cement according to the mass percentage, and mixing to obtain a soil body curing agent; wherein, the industrial by-product gypsum is desulfurized gypsum and titanium gypsum, and the mixing mass ratio of the desulfurized gypsum to the titanium gypsum is 1: 1;
(3) the reinforcing soil is selected from mucky clay with the depth of 7-8 m and the natural water content of 42%, and the experimental water-to-gel ratio of the reinforcing soil is 0.5 by using a soil body curing agent doped with sludge incineration ash;
the pH of the titanium gypsum adopted in the embodiment is 9, and the pH does not need to be adjusted; the concrete mixing ratio of the cementing material and the unconfined compressive strength of the reinforced soil 7d are shown in the following table 3; in cases 1-3, the mixing amount of the curing agent is 12%; in cases 4 to 7, the mixing amounts of the curing agent were 10%, 16%, 20% and 30%, respectively.
Table 3: soil stabilization test of curing agent doped with sludge incineration ash
The result shows that when the mixing amount of the curing agent is 12 percent, the comparative group is singly mixed cement, the 7d compressive strength is only 1.62MPa, and after the cement is replaced by an industrial byproduct gypsum-incineration ash-slag powder three-solid waste system, the strength of the reinforced soil is improved to 2.86MPa at most, and the improvement rate is up to 76 percent.
As can be seen from case 1, the composite system formed by compounding the industrial byproduct gypsum incineration ash can excite the active SiO in the slag powder2And active Al2O3Activity; and when the soil body is solidified, free water in the soil body is converted into high crystal water, so that the content of the free water in the soil body is further reduced.
Specifically, it can be represented by the following formula:
xCa(OH)2+SiO2+(n-1)H2O→xCaO·SiO2·nH2O
(1.5～2.0)CaO·SiO2·aq+SiO2→(0.8～1.5)CaO·SiO2·aq
3CaO·Al2O3·6H2O+SiO2+mH2O→xCaO·SiO2·mH2O+yCaO·Al2O3·nH2O
xCa(OH)2+Al2O3+mH2O→xCaO·Al2O3·nH2O
3Ca(OH)2+Al2O3+2SiO2+mH2O→3CaO·Al2O3·2SiO2·nH2O
3CaO·Al2O3·6H2O+Ca(OH)2+6H2O→4CaO·Al2O3·13H2O
4CaO·Al2O3·13H2O+3(CaSO4·2H2O)+14H2O→3CaO·Al2O3·3CaSO4·32H2O+Ca(OH)2
meanwhile, by combining table 3 and fig. 2, it can be known that as the mixing amount of the curing agent increases, the 7d unconfined compressive strength of the cured soil body increases; when the mixing amount of the curing agent is increased from 10% to 20%, the strength increase amplitude is obvious and is 30.3%, and when the mixing amount of the curing agent is continuously increased from 20% to 30%, the strength increase trend is slowed and is 27.4%.
Example 3
In the embodiment, the curing agent doped with the sludge incineration ash replaces cement to be used for reinforcing the soil roadbed, and the concrete steps are as follows:
(1) performing the screening according to a 45-micron negative pressure screening method in GB/T1345, wherein the screening time is 3min, and the fineness of the obtained sludge incineration ash residue is 30.2%; through tests, the safety indexes such as heavy metal leaching concentration, dioxin and the like are qualified;
(2) the selected industrial byproduct gypsum is a byproduct in the production of phosphate fertilizer, namely titanium gypsum, the water content of the titanium gypsum is 1.2%, the pH of the titanium gypsum is 3 through tests, and 0.5% of slaked lime is added to be used as a modifier to adjust the pH to be 6-11.
(3) And weighing the sludge incineration ash, industrial byproduct gypsum, slag powder and cement according to the mass percentage, and mixing to obtain the soil body curing agent doped with the sludge incineration ash.
(4) The reinforced soil is road foundation soil, and the water-cement ratio in the embodiment is 0.46.
In the embodiment, the mixing amount of the curing agents in the comparison group and the comparison cases 1-3 is 6%, the mixing amount of the curing agents in the comparison cases 4-7 is 4%, 8%, 10% and 15%, and the mixing amount of the curing agents is the percentage of the total weight of the curing agents and the soil roadbed soil.
Table 4: test result of stabilizing soil roadbed by curing agent doped with sludge incineration ash
As can be seen from Table 4, when pure cement is used for curing the soil, the 7d unconfined compressive strength is 2.62MPa, and when the industrial by-product gypsum and incineration ash slag are used as a curing agent for curing the soil in a complex mixing manner, the 7d unconfined compressive strength is higher than that of the pure cement; and the higher the 7d unconfined compressive strength of the solidified soil along with the increase of the mixing amount of the curing agent, and when the mixing amount of the curing agent is 15%, the 7d unconfined strength of the soil body is 3.86 MPa.
Meanwhile, as can be seen from fig. 3, the strength of the solidified soil with the addition amount has the same trend as that in table 3, and the strength of the solidified soil increases with the increase of the addition amount, but the increase is increased first and then decreased.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The soil body curing agent doped with sludge incineration ash is characterized by comprising the following materials in parts by weight: 0-30% of sludge incineration ash, 5-10% of gypsum, 40-55% of slag powder and 20-30% of cement.
2. The soil body curing agent doped with sludge incineration ash as claimed in claim 1, wherein the sludge incineration ash refers to dust collected after domestic sewage and sludge incineration treatment, and the sludge incineration temperature is 450-1000 ℃.
3. The soil body curing agent doped with sludge incineration ash as claimed in claim 1, wherein the gypsum comprises one or more of desulfurized gypsum, fluorgypsum, titanium gypsum, phosphogypsum and dry-sintered desulfurized ash.
4. The soil body curing agent doped with sludge incineration ash as claimed in claim 1, wherein the content of calcium sulfate dihydrate of the gypsum is not less than 75%, a weak acid or a weak base substance is used as a pH regulator for regulation, and the pH of the regulated gypsum is 6-12.
5. The soil body curing agent doped with sludge incineration ash as claimed in claim 4, wherein the addition amount of the pH regulator is 0-1% of that of gypsum.
6. The soil body solidifying agent doped with sludge incineration ash as claimed in claim 4, wherein the pH regulator comprises one or more of phosphate, calcium hydroxide and ammonia water.
7. The soil body curing agent doped with sludge incineration ash as claimed in claim 1, wherein when the curing agent is used for reinforcing high soft soil foundation, the usage ratio of the curing agent to the soft soil is 10% -30%.
8. The soil body curing agent doped with sludge incineration ash as claimed in claim 1, wherein the ratio of the curing agent to the soil is 4% -15% when the curing agent is used for roadbed reinforcement.
9. A method for preparing a soil body solidifying agent doped with sludge incineration ash as defined in any one of claims 1 to 8, which comprises the steps of: performing ball milling treatment on sludge incineration ash, and adjusting the pH value of gypsum to 6-12 by using a pH regulator; and weighing the sludge incineration ash, gypsum, slag powder and cement in proportion, and mixing to obtain the soil body curing agent doped with the sludge incineration ash.
10. The preparation method according to claim 9, wherein the ball milling time of the sludge incineration ash is 5min to 20 min.
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| CN114933462A (en) * | 2021-11-08 | 2022-08-23 | 东营天识环保科技有限公司 | Method for manufacturing roadbed base layer and subbase layer materials by utilizing titanium gypsum |
| CN115259715A (en) * | 2022-08-25 | 2022-11-01 | 上海城建物资有限公司 | Novel anti-caking agent and preparation and application thereof |
| CN116063011A (en) * | 2022-12-23 | 2023-05-05 | 上海市建筑科学研究院有限公司 | Cementing material special for secant pile concrete and preparation method and application thereof |
| CN116553852A (en) * | 2023-04-10 | 2023-08-08 | 上海复洁环保科技股份有限公司 | Retarder and reinforcing agent, retarder cement for roads and preparation method of retarder and reinforcing agent |
| CN117658577A (en) * | 2023-12-05 | 2024-03-08 | 广州市市政工程试验检测有限公司 | Soft soil curing agent based on garbage incineration secondary bottom slag and preparation method and application thereof |
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| CN117658577A (en) * | 2023-12-05 | 2024-03-08 | 广州市市政工程试验检测有限公司 | Soft soil curing agent based on garbage incineration secondary bottom slag and preparation method and application thereof |
| CN117658577B (en) * | 2023-12-05 | 2024-06-18 | 广州市市政工程试验检测有限公司 | Soft soil curing agent based on garbage incineration secondary bottom slag and preparation method and application thereof |
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