CN116947406A - Composite slurry for stirring pile foundation reinforcement engineering - Google Patents
Composite slurry for stirring pile foundation reinforcement engineering Download PDFInfo
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- CN116947406A CN116947406A CN202310700571.5A CN202310700571A CN116947406A CN 116947406 A CN116947406 A CN 116947406A CN 202310700571 A CN202310700571 A CN 202310700571A CN 116947406 A CN116947406 A CN 116947406A
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- 238000003756 stirring Methods 0.000 title claims abstract description 89
- 239000002002 slurry Substances 0.000 title claims abstract description 81
- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 230000002787 reinforcement Effects 0.000 title claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 117
- 239000002689 soil Substances 0.000 claims abstract description 107
- 239000000843 powder Substances 0.000 claims abstract description 63
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 52
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 52
- 239000011707 mineral Substances 0.000 claims abstract description 52
- 239000000440 bentonite Substances 0.000 claims abstract description 49
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 49
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 235000019738 Limestone Nutrition 0.000 claims abstract description 40
- 239000006028 limestone Substances 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 34
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 29
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000007596 consolidation process Methods 0.000 claims abstract description 27
- 229920005551 calcium lignosulfonate Polymers 0.000 claims abstract description 25
- 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 claims abstract description 25
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 34
- 235000019353 potassium silicate Nutrition 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 20
- 238000004090 dissolution Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 239000008399 tap water Substances 0.000 claims description 12
- 235000020679 tap water Nutrition 0.000 claims description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000004927 clay Substances 0.000 claims description 6
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000003945 anionic surfactant Substances 0.000 claims description 2
- 239000013505 freshwater Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 6
- 230000015271 coagulation Effects 0.000 abstract description 4
- 238000005345 coagulation Methods 0.000 abstract description 4
- 239000005416 organic matter Substances 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 235000010755 mineral Nutrition 0.000 description 43
- 235000017550 sodium carbonate Nutrition 0.000 description 18
- 239000000463 material Substances 0.000 description 15
- 238000013461 design Methods 0.000 description 13
- 230000035699 permeability Effects 0.000 description 13
- 238000012360 testing method Methods 0.000 description 9
- 230000036571 hydration Effects 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 8
- 239000002609 medium Substances 0.000 description 8
- 239000003673 groundwater Substances 0.000 description 7
- 239000004576 sand Substances 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000003469 silicate cement Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004581 coalescence Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003415 peat Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012897 dilution medium Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- -1 silt Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B14/104—Bentonite, e.g. montmorillonite
-
- 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
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/0093—Aluminates
-
- 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
- C04B24/16—Sulfur-containing compounds
- C04B24/18—Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a composite slurry for a stirring pile foundation reinforcement project. The composite slurry comprises the following components in parts by weight: 150-350 parts of cement, 45-175 parts of bentonite, 15-35 parts of limestone mineral powder, 10.5-24.5 parts of slag micropowder, 0.45-2.1 parts of calcium lignosulfonate, 0.45-5.25 parts of sodium aluminate, 0.45-5.25 parts of sodium silicate, 0.9-3.5 parts of sodium carbonate and 132.3-584.5 parts of water; the composite slurry is green and environment-friendly, has good economic benefit, simple preparation and wide applicable stratum; the prepared composite slurry and foundation soil can be forcedly stirred to form a cement-soil consolidation body by adopting a conventional stirring pile machine for construction, and the cement-soil consolidation body has the advantages of high coagulation speed, high early compressive strength, good anti-seepage effect, strong acid resistance and strong organic matter erosion resistance, and can be used for soft soil foundation reinforcement engineering, foundation pit waterproof curtain engineering, refuse sanitation landfill seepage prevention engineering and the like.
Description
Technical Field
The invention relates to the technical field of building foundation engineering and rock-soil environment-friendly engineering, in particular to a composite slurry for stirring pile foundation reinforcement engineering.
Background
At present, the cement soil stirring method is widely applied to building foundation reinforcement, side slope reinforcement and stabilization, waterproof curtain, sand liquefaction prevention, abutment back filling reinforcement, underground structure foundation reinforcement, subway station shield machine hole entering and exiting end foundation reinforcement, foundation pit bottom soil reinforcement, supporting wall body engineering, foundation transverse reaction coefficient improvement and the like, and is mainly suitable for treating normally consolidated soil layers such as silt, mucky soil, plain filling soil, cohesive soil (soft plastic and plastic), silt (slightly dense and medium dense), fine sand (loose and medium dense), medium coarse sand (loose and slightly dense), saturated loess and the like.
At present, the construction of a stirring pile is generally carried out by adopting conventional cement-based slurry materials (common silicate cement slurry is added with water and stirred into slurry, the slurry water-cement ratio is 0.7-1.5), the cement soil consolidation time is long, the unconfined compressive strength of the early stage of the pile body is low, the later-stage strength is slowly increased (the 28d age strength is less than 1.5 MPa), the impermeability of the cement soil consolidated body is also low (the permeability coefficient of the 28d age cement soil consolidated body is generally more than 10) ～7 cm/s) and cannot be used directly for treating peat soil, acid soil with a high organic matter content or a pH value of less than 4, clay with a plasticity index of more than 25 or soil layers in corrosive environments, the suitability of such soil layer stirring pile methods must be determined by field and indoor tests. This is because, since a series of chemical reactions between organic matters (or strong acidity and strong corrosiveness) in the soil and cement minerals take place, the growth of cement hydration product crystals is hindered, which is unfavorable for the increase of the strength of cement soil, and the higher the content of organic matters, the stronger the acidity, the higher the content of sticky particles and the higher the corrosiveness in the soil, the more unfavorable for the growth of cement hydration crystals and the increase of the strength of cement soil.
Therefore, the composite slurry is prepared for the construction of the stirring pile engineering, and the performance index requirements of high setting speed, high early compressive strength, good anti-seepage effect, wide stratum, strong acid and alkali resistance and strong organic matter erosion capability of the cement-soil consolidation body are very necessary.
Disclosure of Invention
The invention aims to overcome the defects of cement-based slurry used in the existing mixing pile method, and provides a composite slurry for mixing pile foundation reinforcement engineering, which has the advantages of high setting speed, high early compressive strength, good anti-seepage effect, environmental protection and wide applicable stratum.
The technical scheme of the invention is as follows: a composite slurry for a stirring pile foundation reinforcement project comprises the following components in parts by weight: 150-350 parts of cement, 45-175 parts of bentonite, 15-35 parts of limestone mineral powder, 10.5-24.5 parts of slag micropowder, 0.45-2.1 parts of calcium lignosulfonate, 0.45-5.25 parts of sodium aluminate, 0.45-5.25 parts of sodium silicate, 0.9-3.5 parts of sodium carbonate and 132.3-584.5 parts of water.
Further, the cement is ordinary Portland cement (or Portland cement, slag Portland cement), the strength grade of the cement is 42.5 (or 42.5R, 52.5), and the cement is a hydraulic cementing material of a cement-soil consolidated body.
Further, the bentonite is clay with 30-80% of montmorillonite mineral content, and is used for reducing the permeability coefficient of the cement soil consolidation body and improving the impermeability of the consolidation body.
Further, the calcium carbonate content of the limestone mineral powder is more than 95%, and the particle size of the limestone mineral powder is 200-800 meshes; the slag micropowder is of grade S95 (or grade S105), and the particle diameter is 300-800 meshes. Limestone mineral powder and slag micropowder belong to active materials, so as to improve the activity of cement hydration, strengthen the capability of a cement soil reinforcement body for resisting acid components and organic matters in natural soil and improve the early strength of the consolidation body.
Further, the calcium lignosulfonate is a multi-component high polymer anionic surfactant (water reducer of cement), has a molecular weight of 1000-10000, and is used for preventing the cement particles from forming a network structure due to coalescence, improving the hydration condition of the cement particles in contact with water, and increasing the fluidity of slurry.
Further, the sodium aluminate has a chemical formula of NaAlO 2 The purity is more than 85%, and the powder is white crystalline powder; the modulus of the water glass is 2.3-3.4. Sodium aluminate and water glass belong to cement accelerator, have a certain early strength, play a role in accelerating cement slurry, enable cement soil to be thickened and solidified quickly, shorten the coagulation time and be beneficial to improving the early strength of cement soil concretions.
Further, the sodium carbonate is industrial sodium carbonate, is a sodium material of calcium bentonite, and improves the dispersion stability of the bentonite.
Furthermore, the water is tap water (or river water, freshwater lake water and underground water, which should meet the first and second water quality standards), the water is hydration medium of cement, bentonite, limestone mineral powder, slag micropowder and other materials, and is dissolution dilution medium of calcium lignosulfonate, sodium carbonate, sodium aluminate, sodium silicate and other materials.
A preparation method of a composite slurry for a stirring pile foundation reinforcement project comprises the following steps:
(1) Taking 0.45-2.1 parts of calcium lignosulfonate, and adding 4.5-21 parts of water for dissolution;
(2) Taking 0.9-3.5 parts of sodium carbonate, and adding 4.5-17.5 parts of water for dissolving;
(3) Taking 45-175 parts of bentonite, adding 45-175 parts of water for soaking and dispersing, then adding the sodium carbonate solution prepared in the step (2) into the bentonite, stirring for 10min to prepare bentonite slurry, and standing for more than 8h for later use;
(4) Taking 0.45-5.25 parts of sodium aluminate, and adding 1.35-15.75 parts of water for dissolution;
(5) 0.45 to 5.25 portions of water glass and 1.35 to 15.75 portions of water are added for dilution;
(6) Mixing 150-350 parts of cement, 15-35 parts of limestone mineral powder and 10.5-24.5 parts of slag micropowder uniformly to form a mixture, adding the rest water and uniformly stirring, then adding the calcium lignosulfonate solution prepared in the step (1), uniformly stirring, continuously adding the bentonite slurry prepared in the step (3), uniformly stirring, adding the sodium aluminate solution prepared in the step (4), uniformly stirring, finally adding the water glass solution prepared in the step (5), and uniformly stirring to obtain the composite slurry.
Further, bentonite, limestone mineral powder, slag micro powder, calcium lignosulfonate, sodium aluminate and water glass in the composite slurry have a specific proportional relation with the cement addition, wherein the bentonite addition is 30% -50% of the cement addition, the limestone mineral powder addition is 10% of the cement addition, the slag micro powder addition is 7% of the cement addition, the calcium lignosulfonate addition is 0.3% -0.6% of the cement addition, the sodium aluminate and the water glass addition are both 0.3% -1.5% of the cement addition, and the proportion of the sodium aluminate to the water glass addition is kept as 1:1.
further, the addition of sodium carbonate in the composite slurry has a specific proportional relationship with the addition of bentonite, the addition of sodium carbonate is generally 2% of the addition of bentonite, for example, the addition of sodium carbonate can be relatively reduced if the montmorillonite mineral content of bentonite is high, and vice versa.
Further, the water-solid ratio of the composite slurry is 0.6-1.0 (the ratio of the total water addition to the sum of the weights of the mixtures of cement, bentonite, limestone mineral powder, slag micropowder and the like).
A construction method of a stirring pile for a composite slurry for a stirring pile foundation reinforcement project utilizes a multi-shaft stirring pile machine (single shaft, double shaft, triple shaft, five shafts, seven shafts and the like) to stir in situ, and the composite slurry and a soft soil foundation are mixed and solidified to finally form a cement soil solidified body.
Further, the mixing ratio of the cement and mineral powder in the cement-soil consolidation body of the stirring pile is 15-35% (which means that the weight of the cement and the limestone mineral powder and the slag micro powder accounts for the weight percentage of the treated soft soil foundation).
Further, the strength and the impermeability of the cement soil consolidation body of the composite slurry are closely related to the uniformity of slurry stirring in preparation of the cement soil consolidation body of the composite slurry, in order to ensure the uniformity of slurry preparation of the composite slurry, advanced digital display stirring equipment is required to be adopted, stirring parameters such as stirring time, stirring speed and the like are controlled, meanwhile, the cement ratio is properly adjusted according to the requirements of the slurry fluidity and pumpability period, and the prepared slurry is ensured to be uniformly mixed.
Furthermore, in order to realize the strength and the impermeability index of the cement-soil consolidation body, the mixing uniformity of the composite slurry material and the soft soil foundation and the mixing ratio of the curing agents such as cement should be ensured when the construction of the stirring pile for reinforcing the foundation is carried out, and the setting of the grouting pipeline of the stirring pile machine should take the factors of ensuring uniform grouting, preventing blockage and the like into consideration.
Furthermore, the cement-soil consolidation body has the advantages of quick setting time, high early strength, good impermeability effect and wide applicable stratum, the unconfined compressive strength of the 7d age reaches more than 0.9MPa, the unconfined compressive strength of the 28d age reaches more than 2.5MPa, the unconfined compressive strength of the 60d age reaches more than 3.0MPa, and the permeability coefficient of the 28d age is less than 0.65X10 -8 cm/s to meet the requirements of bearing capacity and deformation of the composite foundation or the anti-seepage design requirement of the waterproof curtain wall.
Furthermore, the cement soil consolidation body is not only suitable for treating normally consolidated soil layers such as silt, mucky soil, plain fill soil, cohesive soil (soft plastic and moldable), silt (slightly dense and medium dense), fine silt (loose and medium dense), medium coarse sand (loose and medium dense), saturated loess and the like; can also be used for treating peat soil, acid soil with higher organic matter content and pH value less than 4 or soil in corrosive environment.
The beneficial effects of the invention are as follows:
(1) The composite slurry for the stirring pile foundation reinforcement engineering has good compatibility, simple preparation method and construction method, low cost of the used slurry material, no environmental pollution, high setting speed of the formed cement-soil consolidation body, high early compressive strength, good anti-seepage effect, wide applicable foundation soil types and wide market application prospect.
Firstly, because bentonite material is doped in the slurry material, for example, common low-cost calcareous bentonite (sodium treatment is carried out on the calcareous bentonite by using sodium carbonate) is adopted, the seepage-proofing effect of the cement soil reinforcing body can be obviously improved, and the permeability coefficient of the 28d age is less than 0.65X10 -8 cm/s, can meet the requirements of the vertical impervious wall of the refuse landfill,Design requirements of seepage-proofing engineering such as underground engineering waterproof curtain wall.
Secondly, the selected limestone mineral powder and slag micropowder belong to active materials, replace the function of the fly ash in the traditional slurry formula, particularly, most of the current thermal power plants use clean energy sources such as natural gas and the like to generate electricity, the supply amount of the fly ash in the market is less, and the supply sources of the limestone mineral powder and the slag micropowder are sufficient, so that the method is also a requirement for developing recycling economy. Cement and the two mineral powders (limestone mineral powder and slag micro powder) are mixed together for use, so that the activity of cement hydration is improved, the capability of the cement soil reinforcement for resisting acid components and organic matters in natural soil is enhanced, the early strength of the consolidated body is improved, the unconfined compressive strength of the 7d age of the cement soil consolidated body reaches more than 0.9MPa, the unconfined compressive strength of the 28d age reaches more than 2.5MPa, the unconfined compressive strength of the 60d age reaches more than 3.0MPa, and the unconfined compressive strength indexes of the consolidated body of the cement soil manufactured by the conventional mixing pile at each coagulation stage are obviously higher than those of the unconfined compressive strength indexes of the consolidated body of the cement soil manufactured by the conventional mixing pile.
And thirdly, as the slurry is doped with the sodium aluminate and water glass mixed cement accelerator and has a certain early strength effect, the cement slurry is accelerated to coagulate, the cement soil can be thickened and solidified rapidly, the coagulation time is shortened, the influence of organic matters in the soil (or the soil in the corrosive environment) on the hydration and solidification of the cement is reduced, and the early strength of the cement soil solidified body is improved.
And thirdly, calcium lignosulfonate is doped in the slurry, so that the cement water reducing agent is a cement water reducing agent which is low in cost and applicable, is used for preventing a network structure formed by cement particles due to coalescence, improving the hydration condition of the cement particles in contact with water, and increasing the fluidity of the slurry.
Finally, the composite slurry has good compatibility, and the addition of bentonite, limestone mineral powder, slag micropowder, calcium lignosulfonate, sodium aluminate, water glass and the like in the slurry has a specific proportion relation with the addition of cement, and the addition of sodium carbonate has a specific proportion relation with the addition of bentonite.
(2) The stirring pile construction method for the composite slurry used for the stirring pile foundation reinforcement engineering has the advantages of simple preparation process and convenient operation, and can stir and solidify the composite slurry and the soft soil foundation in situ by using a conventional multi-shaft stirring pile machine (single shaft, double shaft, triple shaft, five shafts, seven shafts and the like) without using professional equipment during construction, so that a cement soil solidified body is finally formed. The pile length of the stirring pile can be determined according to the capacity of mechanical equipment, soil layers and engineering requirements so as to meet the requirements of bearing capacity and deformation of a composite foundation or the anti-seepage design requirement of a waterproof curtain wall.
(3) The cement soil mixing pile manufactured by adopting the composite slurry material has low cost. Because cement, bentonite, limestone mineral powder and slag micropowder are combined together for use, the cement consumption is greatly reduced, and the cement-soil consolidation body has high compressive strength in the age, under the condition of meeting the same design value of the bearing capacity of the composite foundation, compared with a stirring pile made of conventional cement-based slurry materials, the treatment area replacement rate of the stirring pile (namely the total number of the distributed piles) can be greatly reduced, so that the unit cost of the stirring pile is reduced by 20-30% in a same way, the economic benefit is good, and the social benefit is obvious.
Detailed Description
The invention will be described in detail with reference to specific examples below:
example 1:
in a foundation pit waterproof curtain engineering, a foundation pit is excavated for 11m, and is mainly used for filling soil, mucky soil, cohesive soil, silt, clay, fine powder and other strata, a conventional triaxial mixing pile machine is adopted for constructing a cement soil mixing pile as a waterproof curtain wall of the foundation pit, the pile length of the mixing pile is 20m, the design requires that the unconfined compressive strength of the cement soil consolidation body of the mixing pile in the 7d age period reach more than 0.9MPa, the unconfined compressive strength of the mixing pile in the 28d age period reach more than 2.5MPa, the unconfined compressive strength of the mixing pile in the 60d age period reach more than 3.0MPa, and the permeability coefficient of the mixing pile in the 28d age period is lower than 0.65x10 -8 cm/s。
According to the design requirements, preparing composite slurry, and taking the following components in parts by weight: 230 parts of cement (42.5-grade ordinary Portland cement), 95 parts of bentonite (the content of montmorillonite is more than 50%, 41% of cement addition), 23 parts of limestone mineral powder (the content of calcium carbonate is more than 95%, the particle size of the limestone mineral powder is between 200 and 800 meshes), 16 parts of slag powder (S95 grade, the particle size of the limestone mineral powder is between 300 and 800 meshes), 2 parts of sodium aluminate (the purity of the sodium aluminate reaches more than 85%), 2 parts of water glass (modulus 2.8), 1.1 parts of calcium lignosulfonate (the molecular weight is between 1000 and 10000), 1.9 parts of sodium carbonate and 291.2 parts of tap water (the water taking-to-solid ratio is 0.8, and is the ratio of the total addition amount of water to the sum of the weight of the mixture of cement, bentonite, limestone mineral powder, slag micropowder and the like).
The preparation method of the composite slurry material is carried out on the engineering construction site, and comprises the following steps:
(1) Taking 1.1 parts of calcium lignosulfonate, and adding 11 parts of tap water for dissolution;
(2) Taking 1.9 parts of sodium carbonate, and adding 9.5 parts of tap water for dissolution;
(3) Taking 95 parts of bentonite, adding 95 parts of tap water for soaking and dispersing, then adding the soda solution prepared in the step (2) into the bentonite, stirring for 10min to prepare bentonite slurry, and standing for more than 8 h;
(4) 2 parts of sodium aluminate is taken, and 6 parts of tap water is added for dissolution;
(5) 2 parts of water glass is taken, and 6 parts of tap water is added for dilution;
(6) Mixing 220 parts of cement, 23 parts of limestone mineral powder and 16 parts of slag powder uniformly to form a mixture, adding 163.7 parts of tap water (the total water adding amount remained), stirring for 5 minutes to a uniform state, then adding the calcium lignosulfonate solution prepared in the step (1), stirring for 5 minutes to a uniform state, continuing to add the bentonite slurry prepared in the step (3), stirring for 5 minutes to a uniform state, then adding the sodium aluminate solution prepared in the step (4), stirring for 5 minutes to a uniform state, finally adding the sodium silicate solution prepared in the step (5), and stirring for 5 minutes to a uniform state to obtain the composite slurry.
The construction site selects a conventional triaxial mixing pile machine to manufacture the composite slurry mixing pile, and the construction steps are as follows: (1) moving the triaxial mixing pile machine to a specified pile position; (2) And (3) starting the stirring pile machine, stirring the prepared composite slurry and the soft soil foundation to form a cement soil consolidation body, and controlling the rotation speed, the movement speed and the grouting pump quantity of the stirring machine to ensure that the mixing ratio of the cement to the mineral powder in the cement soil consolidation body reaches about 25% (the weight of the sum of the cement, the limestone mineral powder and the slag micro powder accounts for the weight percentage of the treated soft soil foundation) and the stirring uniformity.
And (3) taking 7d, 28d and 60 d-age stirring pile cement soil samples on site, testing the strength index of the cement soil concretion sample by using an electronic universal experiment compressor, and testing the permeability coefficient of the cement soil concretion sample by using a TST-55 type variable head permeameter. The 7d age unconfined compressive strength of the cement soil consolidation body of the stirring pile on the site is 1.2MPa, the 28d age unconfined compressive strength is 2.8MPa, the 60d age unconfined compressive strength is 3.3MPa, and the 28d age permeability coefficient is 0.45 multiplied by 10 -8 cm/s, and meets the design requirements of the foundation pit engineering waterproof curtain engineering.
Example 2:
the anti-seepage engineering of a sanitary landfill site for household garbage has the advantages that the landfill height is 12m, the site foundation is mainly soil layers such as miscellaneous fill, silt clay, cohesive soil, silt soil, fine sand and the like from the lower part of the ground, a five-shaft stirring pile machine is selected to construct a cement soil stirring pile as an anti-seepage wall of the landfill site, the pile length of the stirring pile is 23m, the design requires that the 7 d-age unconfined compressive strength of the cement soil of the stirring pile reaches more than 0.9MPa, the 28 d-age unconfined compressive strength reaches more than 2.5MPa, the 60 d-age unconfined compressive strength reaches more than 3.0MPa, and the 28 d-age permeability coefficient is lower than 0.65x10 -8 cm/s。
According to the design requirements, preparing composite slurry, and taking the following components in parts by weight: 150 parts of cement (52.5-grade silicate cement), 45 parts of bentonite (the montmorillonite mineral content is about 80%, the lower limit value of 30% of cement addition amount is taken), 15 parts of limestone mineral powder (the calcium carbonate content is more than 95%, the grain size of the limestone mineral powder is between 200 and 800 meshes), 10.5 parts of slag powder (S105 grade, the grain size of the limestone mineral powder is between 300 and 800 meshes), 0.45 parts of sodium aluminate (the purity of which is more than 85%), 0.45 parts of sodium silicate (modulus is 2.3), 0.45 parts of calcium lignosulfonate (molecular weight is between 1000 and 10000), 0.9 parts of sodium carbonate and 220.5 parts of river water (the water quality is taken, and the water-solid ratio is 1.0, and is the ratio of the total water addition amount to the sum of the weights of the cement, bentonite, the limestone mineral powder, slag micropowder and other mixtures).
The preparation method of the composite slurry material is carried out on the engineering construction site, and comprises the following steps:
(1) Taking 0.45 part of calcium lignosulfonate, and adding 4.5 parts of river water for dissolution;
(2) Taking 0.9 part of sodium carbonate, and adding 4.5 parts of river water for dissolution;
(3) Taking 45 parts of bentonite, adding 45 parts of river water for soaking and dispersing, then adding the sodium carbonate solution prepared in the step (2) into the bentonite, stirring for 10min to prepare bentonite slurry, and standing for more than 8 h;
(4) Taking 0.45 part of sodium aluminate, and adding 1.35 parts of tap water for dissolution;
(5) Taking 0.45 part of water glass, and adding 1.35 parts of tap water for dilution;
(6) Mixing 150 parts of cement, 15 parts of limestone mineral powder and 10.5 parts of slag powder uniformly to form a mixture, adding 163.8 parts of tap water (the total water adding amount remained), stirring for 5 minutes to a uniform state, then adding the calcium lignosulfonate solution prepared in the step (1), stirring for 5 minutes to a uniform state, continuing to add the bentonite slurry prepared in the step (3), stirring for 5 minutes to a uniform state, then adding the sodium aluminate solution prepared in the step (4), stirring for 5 minutes to a uniform state, finally adding the water glass solution prepared in the step (5), and stirring for 5 minutes to a uniform state to obtain the composite slurry.
The method comprises the following construction steps of: (1) moving the five-axis mixing pile machine to a designated pile position; (2) And (3) starting the stirring pile machine, stirring the prepared composite slurry and the soft soil foundation to form a cement soil consolidation body, and controlling the rotation speed, the movement speed and the grouting pump quantity of the stirring machine to ensure that the mixing ratio of the cement to the mineral powder in the cement soil consolidation body is more than 15% (the weight of the sum of the cement, the limestone mineral powder and the slag micro powder accounts for the weight percentage of the treated soft soil foundation) and the stirring uniformity.
And (3) taking 7d, 28d and 60 d-age stirring pile cement soil concretion samples on site, testing the strength index of the cement soil concretion samples by using an electronic universal experiment compressor, and testing the permeability coefficient of the cement soil concretion samples by using a TST-55 type variable head permeameter. No-side of 7d age of cement-soil concretion body of stirring pile on test siteThe confined compressive strength is 0.9MPa, the unconfined compressive strength at 28d age is 2.5MPa, the unconfined compressive strength at 60d age is 3.0MPa, and the permeability coefficient at 28d age is 0.25X10 -8 cm/s, and meets the design requirements of the anti-seepage engineering of the refuse landfill.
Example 3:
in the reinforcing engineering of a soft soil foundation of a certain building, the foundation is mainly filled with soil, muddy clay, silt, cohesive soil and other soil layers, a conventional double-shaft stirring pile machine is selected to construct a cement soil stirring pile for reinforcing the soft soil foundation of the site, the pile length of the stirring pile is 15m, the design requirements of the 7 d-age unconfined compressive strength of the cement soil consolidation body of the stirring pile reach more than 0.9MPa, the 28 d-age unconfined compressive strength reaches more than 2.5MPa, the 60 d-age unconfined compressive strength reaches more than 3.0MPa, and the 28 d-age permeability coefficient is lower than 0.65x10 -8 cm/s。
According to the design requirements, preparing composite slurry, and taking the following components in parts by weight: 350 parts of cement (42.5-grade slag silicate cement), 175 parts of bentonite (the content of montmorillonite mineral is above 30%, the upper limit value of 50% of the addition amount of cement is obtained), 35 parts of limestone mineral powder (the content of calcium carbonate is above 95%, the particle size of the limestone mineral powder is between 200 and 800 meshes), 24.5 parts of slag powder (S95 grade, the particle size of the limestone mineral powder is between 300 and 800 meshes), 5.25 parts of sodium aluminate (the purity of which is above 85%), 5.25 parts of sodium silicate (modulus 3.4), 2.1 parts of calcium lignosulfonate (the molecular weight is between 1000 and 10000), 3.5 parts of soda ash and 350.7 parts of groundwater (water quality is obtained, and the water-solid ratio is 0.6, and is the ratio of the total addition amount of water to the sum of the weights of the mixtures such as cement, bentonite, limestone mineral powder and slag micropowder).
The preparation method of the composite slurry material is carried out on the engineering construction site, and comprises the following steps:
(1) 2.1 parts of calcium lignosulfonate is taken, and 21 parts of ground water is added for dissolution;
(2) Taking 3.5 parts of sodium carbonate, and adding 17.5 parts of groundwater for dissolution;
(3) Taking 175 parts of bentonite, adding 175 parts of groundwater for soaking and dispersing, then adding the soda solution prepared in the step (2) into the bentonite, stirring for 10min to prepare bentonite slurry, and standing for more than 8 h;
(4) Taking 5.25 parts of sodium aluminate, and adding 15.75 parts of groundwater for dissolution;
(5) Taking 5.25 parts of water glass, and adding 15.75 parts of groundwater for dilution;
(6) Mixing 350 parts of cement, 35 parts of limestone mineral powder and 24.5 parts of slag powder uniformly to form a mixture, adding 105.7 parts of ground water (the total water adding amount remained) and stirring for 5 minutes to a uniform state, then adding the calcium lignosulfonate solution prepared in the step (1), stirring for 5 minutes to a uniform state, continuing to add the bentonite slurry prepared in the step (3), stirring for 5 minutes to a uniform state, then adding the sodium aluminate solution prepared in the step (4), stirring for 5 minutes to a uniform state, finally adding the water glass solution prepared in the step (5), and stirring for 5 minutes to a uniform state to obtain the composite slurry.
The method comprises the following construction steps of: (1) moving the double-shaft mixing pile machine to a designated pile position; (2) And (3) starting the stirring pile machine, stirring the prepared composite slurry and the soft soil foundation to form a cement soil consolidation body, and controlling the rotation speed, the movement speed and the grouting pump quantity of the stirring machine to ensure that the mixing ratio of the cement to the mineral powder in the cement soil consolidation body is more than 35% (the weight of the sum of the cement, the limestone mineral powder and the slag micro powder accounts for the weight percentage of the treated soft soil foundation) and the stirring uniformity.
And (3) taking 7d, 28d and 60 d-age stirring pile cement soil concretion samples on site, testing the strength index of the cement soil concretion samples by using an electronic universal experiment compressor, and testing the permeability coefficient of the cement soil concretion samples by using a TST-55 type variable head permeameter. The 7d age unconfined compressive strength of the cement soil consolidation body of the stirring pile on the test site is 1.25MPa, the 28d age unconfined compressive strength is 2.85MPa, the 60d age unconfined compressive strength is 3.65MPa, and the 28d age permeability coefficient is 0.65X10 -8 cm/s, and all meet the design requirements of the soft soil foundation reinforcement engineering.
The method comprises the following steps: specific formulation of composite slurry materials and performance index of cement-soil consolidation body of examples 1-3
Claims (6)
1. The composite slurry for the stirring pile foundation reinforcement engineering is characterized by comprising the following components in parts by weight: 150-350 parts of cement, 45-175 parts of bentonite, 15-35 parts of limestone mineral powder, 10.5-24.5 parts of slag micropowder, 0.45-2.1 parts of calcium lignosulfonate, 0.45-5.25 parts of sodium aluminate, 0.45-5.25 parts of sodium silicate, 0.9-3.5 parts of sodium carbonate and 132.3-584.5 parts of water; the preparation method of the composite slurry comprises the following steps:
(1) Taking 0.45-2.1 parts of calcium lignosulfonate, and adding 4.5-21 parts of water for dissolution;
(2) Taking 0.9-3.5 parts of sodium carbonate, and adding 4.5-17.5 parts of water for dissolving;
(3) Taking 45-175 parts of bentonite, adding 45-175 parts of water for soaking and dispersing, then adding the sodium carbonate solution prepared in the step (2) into the bentonite, stirring for 10min to prepare bentonite slurry, and standing for more than 8h for later use;
(4) Taking 0.45-5.25 parts of sodium aluminate, and adding 1.35-15.75 parts of water for dissolution;
(5) 0.45 to 5.25 portions of water glass and 1.35 to 15.75 portions of water are added for dilution;
(6) Mixing 150-350 parts of cement, 15-35 parts of limestone mineral powder and 10.5-24.5 parts of slag micropowder uniformly to form a mixture, adding the rest water and uniformly stirring, then adding the calcium lignosulfonate solution prepared in the step (1), uniformly stirring, continuously adding the bentonite slurry prepared in the step (3), uniformly stirring, adding the sodium aluminate solution prepared in the step (4), uniformly stirring, finally adding the water glass solution prepared in the step (5), and uniformly stirring to obtain the composite slurry.
2. A composite slurry for use in a pile foundation stabilization process according to claim 1, wherein the cement is a 42.5-grade or 52.5-grade portland cement; the bentonite is clay containing 30-80% of montmorillonite mineral; the particle size of the limestone mineral powder is 200-800 meshes, and the limestone mineral powder contains more than 95% of calcium carbonate; the grain size of the slag micropowder is 300-800 meshes, and the activity at least reaches S95 grade or above; the calcium lignosulfonate is a multi-component high polymer anionic surfactant, and the molecular weight is between 1000 and 10000; the sodium aluminate is white crystalline powder with the purity of more than 85%; the modulus of the water glass is 2.3-3.4; the sodium carbonate is industrial sodium carbonate; the water is tap water or river water, fresh water lake water and underground water, and the water meets the first and second water quality standards.
3. The composite slurry for the foundation stabilization engineering of the mixing pile according to claim 1, wherein bentonite, limestone mineral powder, slag micropowder, calcium lignosulfonate, sodium aluminate and water glass in the composite slurry all have a specific proportional relationship with the cement addition, wherein the bentonite addition is 30% -50% of the cement addition, the limestone mineral powder addition is 10% of the cement addition, the slag micropowder addition is 7% of the cement addition, the calcium lignosulfonate addition is 0.3% -0.6% of the cement addition, the sodium aluminate and the water glass both are 0.3% -1.5% of the cement addition, and the ratio of the sodium aluminate to the water glass is 1:1.
4. the composite slurry for a foundation stabilization project of a mixing pile according to claim 1, wherein the amount of soda added in the composite slurry has a specific proportional relationship with the amount of bentonite, and the amount of soda added is 2% of the amount of bentonite.
5. The composite type slurry for a foundation stabilization process of a mixing pile according to claim 1, wherein the water-solid ratio of the composite type slurry is 0.6 to 1.0.
6. The composite slurry for a foundation stabilization process of a mixing pile according to claim 1, wherein the mixing ratio of the cement and the mineral powder in the cement-soil consolidation body of the mixing pile is 15% to 35%.
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