CN116947397A - Composite curing method for high liquid limit soil - Google Patents
Composite curing method for high liquid limit soil Download PDFInfo
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- CN116947397A CN116947397A CN202310621171.5A CN202310621171A CN116947397A CN 116947397 A CN116947397 A CN 116947397A CN 202310621171 A CN202310621171 A CN 202310621171A CN 116947397 A CN116947397 A CN 116947397A
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- 239000002689 soil Substances 0.000 title claims abstract description 189
- 239000007788 liquid Substances 0.000 title claims abstract description 131
- 238000001723 curing Methods 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 239000002893 slag Substances 0.000 claims abstract description 57
- 239000004568 cement Substances 0.000 claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 27
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 25
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920001732 Lignosulfonate Polymers 0.000 claims abstract description 20
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 22
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 20
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- 239000010419 fine particle Substances 0.000 claims description 5
- 239000008239 natural water Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 230000006872 improvement Effects 0.000 description 6
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- 238000011049 filling Methods 0.000 description 4
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- 239000007864 aqueous solution Substances 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
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- 239000002699 waste material Substances 0.000 description 3
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N Butyraldehyde Chemical compound CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
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- 239000003513 alkali Substances 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 238000004134 energy conservation Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229920005551 calcium lignosulfonate Polymers 0.000 description 1
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
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- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N valeric aldehyde Natural products CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
A composite curing method of high liquid limit soil comprises the following steps: the water content of the high liquid limit soil is controlled to be 25+/-3%, then cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass and the high liquid limit soil are proportionally added, and mixed and stirred to obtain the solidified soil which can be used for road engineering construction.
Description
Technical Field
The application belongs to the field of high liquid limit soil treatment, and particularly relates to a high liquid limit soil composite curing method.
Background
High liquid limit soil generally refers to fine grained soil with a liquid limit of greater than 50%. As a geological disaster soil, the high liquid limit soil is widely distributed in various places of the whole country, and the main distribution areas are regions such as Yunnan, sichuan, guizhou, fujian, zhejiang, guangdong, guangxi, hunan, anhui and the like, and the actual coverage area exceeds 10 ten thousand square kilometers. The high liquid limit soil has complex constitution, wide distribution surface and poor physical and mechanical properties. It has the advantages of high compressibility, poor permeability, low strength, high natural water content shrinkage due to water loss, expansion due to water absorption, high compaction difficulty and the like. The characteristic characteristics of high liquid limit, high plasticity index and high natural water content of the road pavement are extremely easy to cause uneven settlement of the foundation, cause cracking, settlement or road slippage of the road surface, seriously influence the comfort and the safety of driving and cause national economic loss to a certain extent.
The existing treatment method for the high liquid limit soil mainly comprises physical improvement and chemical improvement. The physical improvement is to add solid materials (coarse aggregates) into the high liquid limit soil. The original particles of the soil body are changed to form a new grading, or the friction resistance is increased by reinforcing the ribs to strengthen the soil body, so that the physical and mechanical properties of the soil body are improved, and the purpose of improving the engineering properties of the soil body is achieved. Or directly changing the poor soil into good roadbed filling. However, the physical improvement method is time-consuming and labor-consuming, and the construction period is prolonged. The chemical improvement is to add a certain substance into the high liquid limit soil to make it react with the soil body in a series of physical and chemical reactions to generate gel hydrate and expansive substances, and to agglomerate soil particles to fill the soil body pores, thereby improving the strength of the soil body. The common curing materials are lime, cement, fly ash and other curing agents. However, these conventional curing agents also have some negative effects: the strong alkali environment formed by the inorganic binder can pollute surrounding soil and underground water, and the service life of the underground steel structure is reduced; the production of cement, lime and the like consumes a great deal of natural resources such as limestone, clay and the like and consumes a great deal of electric energy and heat energy in the production process, and simultaneously discharges CO affecting the air quality 2 、SO 2 Harmful substances such as dust and the like are required to be further improved.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provides a composite curing method for high liquid limit soil.
The application adopts the following technical scheme:
a composite curing method of high liquid limit soil comprises the following steps: controlling the water content of the high liquid limit soil to be 25+/-3%, and then adding cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass and the high liquid limit soil in proportion for mixing and stirring to obtain solidified soil capable of being used for road engineering construction;
wherein, the addition of the cement is 3-7% of the high liquid limit soil mass, the addition of the steel slag powder is 10-20% of the high liquid limit soil mass, the addition of the carbide slag is 6-10% of the high liquid limit soil mass, the addition of the silica fume is 0.5-1% of the high liquid limit soil mass, the addition of the lignosulfonate is 0.05-0.1% of the high liquid limit soil mass, and the addition of the water glass is 0.01-0.5% of the high liquid limit soil mass.
Further, polyvinyl butyral is added, and the addition amount of the polyvinyl butyral is 0-0.05% of the mass of the high liquid limit soil.
Further, sodium dodecyl sulfate is added, and the addition amount of the sodium dodecyl sulfate is 0-0.03% of the mass of the high liquid limit soil.
Further, the natural water content of the high liquid limit soil is 33%, the liquid limit is 50.9%, the plastic limit is 24.5%, and the plastic index is 26.4%.
Further, the CBR of the high liquid limit soil is 5.4%.
Further, the content of fine particles of the high liquid limit soil is 96.5%, and the particle size of the fine particles is less than 0.075mm.
Further, the water content of the high liquid limit soil is controlled to be 25+/-3% after the high liquid limit soil is dried or dried.
As can be seen from the above description of the present application, compared with the prior art, the present application has the following beneficial effects:
firstly, the application limits cement, steel slag powder, carbide slag, silica fume, lignin sulfonate, water glass, polyvinyl butyral and sodium dodecyl sulfate to compound and improve high liquid limit soil so as to meet the roadbed filling requirement, and the cement, steel slag, carbide slag, silica fume and lignin sulfonate undergo hydration reaction and pozzolan reaction under the action of water to generate gelatinous products to solidify soil, thereby improving soil strength and water stability; meanwhile, the water glass is used for providing an alkaline environment, so that hydration reaction of each curing material is promoted, and the strength of the curing soil is further improved; the polyvinyl butyral can absorb water and solidify, so that the water content of soil is reduced; the sodium dodecyl sulfate is used as a surfactant, so that the hydrophilic characteristic of the surface of soil particles is changed, the influence of water on solidified soil is reduced, and the water stability of the soil body is improved;
secondly, the method adopts a limiting method to compound and solidify the high liquid limit soil, improves the road performance of the high liquid limit soil, can be used for road filling, and avoids ecological environment influence and resource waste caused by discarding a large amount of high liquid limit soil; according to the application, cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass, polyvinyl butyral and sodium dodecyl sulfate are adopted to compound and solidify high liquid limit soil, and industrial waste residues such as steel slag powder, carbide slag and the like are used for replacing part of cement, so that the cost is reduced by about 20% compared with the cement used alone, and meanwhile, the adverse effect of alkaline environment formed by excessive cement consumption on surrounding soil is avoided; meanwhile, the utilization of the industrial solid waste solidified high-liquid limit soil has a promoting effect on the recycling of the solid waste, and accords with the development policy of energy conservation and emission reduction and green development in China.
Detailed Description
The application is further described below by means of specific embodiments.
A composite curing method of high liquid limit soil comprises the following steps: controlling the water content of the high liquid limit soil to be 25+/-3%, and then adding cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass, polyvinyl butyral, sodium dodecyl sulfate and the high liquid limit soil in proportion, mixing and stirring to obtain solidified soil capable of being used for road engineering construction;
wherein the addition of cement is 3-7% of the mass of high liquid limit soil, the addition of steel slag powder is 10-20% of the mass of high liquid limit soil, the addition of carbide slag is 6-10% of the mass of high liquid limit soil, the addition of silica fume is 0.5-1% of the mass of high liquid limit soil, the addition of lignosulfonate is 0.05-0.1% of the mass of high liquid limit soil, and the addition of water glass is 0.01-0.5% of the mass of high liquid limit soil; the addition amount of the polyvinyl butyral is 0-0.05% of the mass of the high liquid limit soil; the addition amount of the sodium dodecyl sulfate is 0-0.03% of the mass of the high liquid limit soil.
Wherein the natural water content of the high liquid limit soil is 33%, and the maximum dry density is 1.84g/cm 3 A liquid limit of 50.9%, a plastic limit of 24.5%, a plasticity index of 26.4%, a CBR of 5.4%, fine particlesThe content of (2) is 96.5%, and specifically, the particle diameter of the fine particles is less than 0.075mm.
The water content of the high liquid limit soil is controlled to be 25+/-3% after being dried or dried.
Specifically, cement is an inorganic cementing material, and the curing mechanism is that the cement is mixed with water, and then undergoes hydrolysis, hydration, reaction, hardening and coagulation to form a reaction product with a hard crystal structure; the reaction products have stronger gelation properties, and are the main reason for obviously improving the strength of the cement solidified soil; a part of the cement stone skeleton can be formed; the other part can improve the binding capacity among soil particles, and the reaction products and the soil body form a cement soil whole body, so that the strength is obviously improved; the reaction product of cement contains a large amount of free calcium hydroxide, can absorb moisture and carbon dioxide in the air, and can generate calcium carbonate crystals through carbonization reaction under alkaline conditions, and can also improve the strength of cement solidified soil.
The steel slag powder is a material obtained by drying and grinding steel slag which is a byproduct generated in the steelmaking process, and is industrial solid waste with potential activity. The components are similar to cement, and can be used for partially replacing cement; the solidification mechanism is that the steel slag and pore water in the soil body are subjected to full hydration reaction, so that hydrated calcium silicate gel and calcium hydroxide with gelation characteristics can be generated, the soil framework is greatly enriched, and the bearing capacity of the soil base is improved; the gelling properties of the steel slag powder depend on the active mineral C 2 S、C 3 S、C 4 AF and C 3 Total amount of A and characterization of the loss of Activity mineral Ca (OH) 2 Is a total amount of (2); in addition, the price of the steel slag is cheaper than that of cement, the consumption of cement can be reduced in the improvement process, the manufacturing cost is saved, and the environment is protected.
The calcium carbide slag is waste slag taking calcium hydroxide as a main component after calcium carbide is hydrolyzed to obtain acetylene gas. The solidification mechanism is that after carbide slag is mixed into soil uniformly, the early stage is used for embedding and extruding soil particles to form clusters, the plasticity index of a soil sample is reduced, the optimal water content of raw soil is improved, the strength is increased, the later stage is mainly used for improving the strength by forming crystalline substances, and ion exchange and condensation, pozzolan action, carbonation reaction, crystallization and the like are generated along with the growth of the age, so that the aim of improving the physical and chemical properties of the soil sample is fulfilled.
The silica fume mainly comprises SiO 2 The difference in carbon content of colored impurities in the silica fume causes the color to be slightly different, but the silica fume is mainly light-gray and dark-gray. The silica fume can generate volcanic ash reaction to generate calcium silicate gel in the soil body, and the calcium silicate gel is distributed among soil particles to form a net-shaped framework, so that the overall rigidity of the soil body is increased. In addition, the silica fume has smaller particle diameter and larger specific surface area than cement, the pores in the cement can be filled with the silica fume particles, the compactness of the cement is improved, meanwhile, the silica fume and the cement have the effect of promoting reinforcement, more gel substances are generated, the gel skeleton is firmer and denser, the connection between soil particles is tighter, and the soil body strength is further improved.
Lignosulfonate is a natural polymer compound with a molecular weight of 1000-30000. It is made up by using the leftover material from paper pulp production through the processes of fermentation and extraction of alcohol, then using alkali to make neutralization so as to obtain the invented product mainly containing calcium lignosulfonate and sodium lignosulfonate. Can change the original soil structure to form a more stable structure body after being mixed into the soil. The lignosulfonate is adhered to the surface of the soil particles to form an aggregate which is tightly combined with the soil particles, soil body pores and cracks are gradually filled, and only smaller pores are left on the surface of the soil body to form a more compact soil particle body.
The water glass is an aqueous solution of sodium silicate, has very strong binding power, and the aqueous solution of the water glass has obvious alkaline reaction, so that the alkaline environment caused by the aqueous solution can promote the volcanic ash reaction and the hydration reaction to further improve the generation of a gelled product.
Polyvinyl butyral is a solvent-based resin that is condensed from polyvinyl alcohol and butyraldehyde by an aldolization reaction with an acid catalyst. The water can be quickly solidified when the water is added into the soil body, so that the solidification progress of the soil body is accelerated; meanwhile, after water absorption, the volume of the soil body is expanded, the soil body is extruded, and the strength of the soil body can be better improved.
The molecular structure of the sodium dodecyl sulfate is amphiphilic, one end is hydrophilic group, and the other end is hydrophobic group, so that the sodium dodecyl sulfate is commonly used for a surfactant, and can change the hydrophilic characteristic of the surface of soil particles due to the characteristic of the molecular structure of the sodium dodecyl sulfate, reduce the influence of water on solidified soil and improve the water stability of the soil.
Example 1
A composite curing method of high liquid limit soil comprises the following steps: controlling the water content of the high liquid limit soil to be 22% by adopting an air drying method, and then adding cement, steel slag powder, carbide slag, silica fume, lignin sulfonate, water glass, polyvinyl butyral, sodium dodecyl sulfate and the high liquid limit soil in proportion for mixing and stirring to obtain solidified soil capable of being used for road engineering construction;
the addition amount of cement is 3% of the high liquid limit soil mass, the addition amount of steel slag powder is 11% of the high liquid limit soil mass, the addition amount of carbide slag is 6% of the high liquid limit soil mass, the addition amount of silica fume is 0.5% of the high liquid limit soil mass, the addition amount of lignin sulfonate is 0.1% of the high liquid limit soil mass, and the addition amount of water glass is 0.03% of the high liquid limit soil mass; the addition amount of the polyvinyl butyral is 0.02% of the mass of the high liquid limit soil; the addition amount of the sodium dodecyl sulfate is 0.02 percent of the mass of the high liquid limit soil.
Example 2
A composite curing method of high liquid limit soil comprises the following steps: controlling the water content of the high liquid limit soil to be 28%, and then adding cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass, polyvinyl butyral, sodium dodecyl sulfate and the high liquid limit soil in proportion, and mixing and stirring to obtain solidified soil capable of being used for road engineering construction;
the addition amount of cement is 4% of the high liquid limit soil mass, the addition amount of steel slag powder is 11% of the high liquid limit soil mass, the addition amount of carbide slag is 6.5% of the high liquid limit soil mass, the addition amount of silica fume is 0.7% of the high liquid limit soil mass, the addition amount of lignin sulfonate is 0.08% of the high liquid limit soil mass, and the addition amount of water glass is 0.04% of the high liquid limit soil mass; the addition amount of the polyvinyl butyral is 0.04% of the mass of the high liquid limit soil; the addition amount of the sodium dodecyl sulfate is 0.03 percent of the mass of the high liquid limit soil.
Example 3
A composite curing method of high liquid limit soil comprises the following steps: controlling the water content of the high liquid limit soil to be 25+/-3%, and then adding cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass, polyvinyl butyral, sodium dodecyl sulfate and the high liquid limit soil in proportion, mixing and stirring to obtain solidified soil capable of being used for road engineering construction;
the addition amount of cement is 4% of the high liquid limit soil mass, the addition amount of steel slag powder is 13% of the high liquid limit soil mass, the addition amount of carbide slag is 7% of the high liquid limit soil mass, the addition amount of silica fume is 1% of the high liquid limit soil mass, the addition amount of lignin sulfonate is 0.07% of the high liquid limit soil mass, and the addition amount of water glass is 0.04% of the high liquid limit soil mass; the addition amount of the polyvinyl butyral is 0.02% of the mass of the high liquid limit soil; the addition amount of the sodium dodecyl sulfate is 0.03 percent of the mass of the high liquid limit soil.
Comparative example 1
The composite curing method is basically the same as in example 3, except that: only 3% of cement with high liquid limit soil mass is added and stirred with the high liquid limit soil.
Comparative example 2
The composite curing method is basically the same as in example 3, except that: only 5% of cement with high liquid limit soil mass is added and stirred with the high liquid limit soil.
Comparative example 3
The composite curing method is basically the same as in example 3, except that: only 7% of cement with high liquid limit soil mass is added and stirred with the high liquid limit soil.
Comparative example 4
The composite curing method is basically the same as in example 3, except that: only 8% of cement with high liquid limit soil mass is added and stirred with the high liquid limit soil.
Comparative example 5
The composite curing method is basically the same as in example 3, except that: only 4% cement, 7% carbide slag and high liquid limit soil are added for stirring.
Comparative example 6
The composite curing method is basically the same as in example 3, except that: only 4% of cement and 13% of steel slag powder with high liquid limit soil mass are added and stirred.
Comparative example 7
The composite curing method is basically the same as in example 3, except that: only 3 percent of cement, 13 percent of steel slag powder, 7 percent of carbide slag and high liquid limit soil with high liquid limit soil mass are added for stirring.
Comparative example 8
The composite curing method is basically the same as in example 3, except that: only 3 percent of cement with high liquid limit soil mass, 20 percent of steel slag powder and high liquid limit soil are added for stirring.
Test
The solidified soil prepared in examples 1 to 3 and comparative examples 1 to 7 was subjected to static pressure method to prepare a relative test piece, the test piece was demolded and placed in a standard curing box for oxidation 6d, then immersed in water for curing 1d, and the unconfined compressive strength of 7d was tested, and the test results were shown in the following table:
table 1 test data sheet for various embodiments
| Category(s) | 7d soaking unconfined compressive strength/MPa |
| Example 1 | 0.82 |
| Example 2 | 1.1 |
| Example 3 | 1.34 |
| Comparative example 1 | 0.41 |
| Comparative example 2 | 0.58 |
| Comparative example 3 | 0.84 |
| Comparative example 4 | 1.19 |
| Comparative example 5 | 0.62 |
| Comparative example 6 | 0.56 |
| Comparative example 7 | 0.83 |
| Comparative example 8 | / |
The solidified soil prepared in comparative example 8 is used to prepare a test piece, and the test piece is scattered during the soaking curing for 1d, so that the subsequent unconfined compressive strength test cannot be performed.
From the above table, it is clear that in examples 1 to 3, cement, steel slag powder, carbide slag, silica fume, lignin sulfonate, water glass, polyvinyl butyral and sodium dodecyl sulfate are used for composite curing of high liquid limit soil, and industrial waste residue is used for replacing part of cement, so that the consumption of cement is reduced compared with that of cement used alone in comparative examples 1 to 4, but the same curing effect can be achieved, and good curing performance is achieved; in addition, as is evident from comparison of example 3 with comparative examples 5 to 8, the composite solidification of the slag powder and/or carbide slag alone with high liquid limit soil is weaker than that of example 3; and through comparative example 8, it can be clearly known that the solidification effect is not further improved along with the continuous increase of the steel slag powder, and the steel slag powder needs to be matched with other raw materials to ensure the integral solidification effect of the high liquid limit soil and meet the use requirement.
In conclusion, the method is used for carrying out composite solidification on the high liquid limit soil, so that the road performance of the high liquid limit soil is improved, the high liquid limit soil can be used for road filling, and the ecological environment influence and resource waste caused by the disposal of a large amount of high liquid limit soil are avoided; according to the application, cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass, polyvinyl butyral and sodium dodecyl sulfate are adopted to compound and solidify high liquid limit soil, and industrial waste residues such as steel slag powder, carbide slag and the like are used for replacing part of cement, so that the cost is reduced by about 20% compared with the cement used alone, and meanwhile, the adverse effect of alkaline environment formed by excessive cement consumption on surrounding soil is avoided; meanwhile, the utilization of the industrial solid waste solidified high-liquid limit soil has a promoting effect on the recycling of the solid waste, and accords with the development policy of energy conservation and emission reduction and green development in China.
The foregoing description is only illustrative of the preferred embodiments of the present application and is not to be construed as limiting the scope of the application, i.e., the application is not to be limited to the details of the claims and the description, but rather is to cover all modifications which are within the scope of the application.
Claims (7)
1. A composite curing method of high liquid limit soil is characterized in that: the method comprises the following steps: controlling the water content of the high liquid limit soil to be 25+/-3%, and then adding cement, steel slag powder, carbide slag, silica fume, lignosulfonate, water glass and the high liquid limit soil in proportion for mixing and stirring to obtain solidified soil capable of being used for road engineering construction;
wherein, the addition of the cement is 3-7% of the high liquid limit soil mass, the addition of the steel slag powder is 10-20% of the high liquid limit soil mass, the addition of the carbide slag is 6-10% of the high liquid limit soil mass, the addition of the silica fume is 0.5-1% of the high liquid limit soil mass, the addition of the lignosulfonate is 0.05-0.1% of the high liquid limit soil mass, and the addition of the water glass is 0.01-0.5% of the high liquid limit soil mass.
2. The method for compositely curing the high liquid limit soil according to claim 1, wherein the method comprises the following steps: and polyvinyl butyral is also added, wherein the addition amount of the polyvinyl butyral is 0-0.05% of the mass of the high liquid limit soil.
3. The method for compositely curing the high liquid limit soil according to claim 1, wherein the method comprises the following steps: sodium dodecyl sulfate is also added, and the addition amount of the sodium dodecyl sulfate is 0-0.03% of the mass of the high liquid limit soil.
4. The method for compositely curing the high liquid limit soil according to claim 1, wherein the method comprises the following steps: the natural water content of the high liquid limit soil is 33%, the liquid limit is 50.9%, the plastic limit is 24.5%, and the plastic index is 26.4%.
5. The method for compositely curing the high liquid limit soil according to claim 4, wherein the method comprises the following steps: the CBR of the high liquid limit soil is 5.4%.
6. The method for compositely curing the high liquid limit soil according to claim 4, wherein the method comprises the following steps: the content of the fine particles of the high liquid limit soil is 96.5%, and the particle size of the fine particles is smaller than 0.075mm.
7. The method for compositely curing the high liquid limit soil according to claim 4, wherein the method comprises the following steps: and the water content of the high liquid limit soil is controlled to be 25+/-3% through airing or drying.
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