CN100516133C - Cut-off wall slurry material and wall building technique - Google Patents

Cut-off wall slurry material and wall building technique Download PDF

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Publication number
CN100516133C
CN100516133C CNB2007100240946A CN200710024094A CN100516133C CN 100516133 C CN100516133 C CN 100516133C CN B2007100240946 A CNB2007100240946 A CN B2007100240946A CN 200710024094 A CN200710024094 A CN 200710024094A CN 100516133 C CN100516133 C CN 100516133C
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China
Prior art keywords
water
parts
retaining
mud
cut
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Expired - Fee Related
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CN101130993A (en
Inventor
代国忠
史贵才
代璐
王兆林
周泓
鲁良辉
靖向党
齐永胜
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Changzhou Institute of Technology
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Changzhou Institute of Technology
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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
    • 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
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00293—Materials impermeable to liquids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The present invention discloses one kind of water tight wall grout material and the wall building process therewith. The wall grout material includes wall protecting slurry comprising bentonite or clay, sodium carbonate, selective flocculant, water loss lowering assistant and water; and curing original mortar comprising Portland cement, sand, fly ash, water glass, water reducing agent, cross-linking agent and water. The water tight wall building process includes the following steps: pouring wall protecting slurry into dug water tight wall slot, adding curing original mortar gradually into the slurry for mixing with wall protecting slurry during digging operation, and adding more water glass in the last stage for curing to form water tight wall. The water tight wall has excellent water tight performance, controllable solidification time, low cost and no pollution.

Description

Cut-off wall slurry material and wall building technique
Technical field
The invention belongs to underground seepage control project field, be specifically related to a kind of cut-off wall slurry material and wall building technique.
Background technology
60～eighties of 20th century, China's cut-off wall material mainly adopts rigid materials such as normal concrete (or Steel Concrete), clay concrete and flyash concrete, these concrete material ultimate compression strength height (5～35MPa), Young's modulus big (15000～32000MPa), be suitable for doing coefficient underground wall bodies such as antiseepage, retaining soil and load-bearing.If only be used for the antiseepage effect, too high (600～1200 yuan/m of employing rigid materials as its construction costs of body of wall 2), and local cracking phenomena easily takes place in rigid concrete under the foundation soil horizontal force action, cause impervious ability to reduce on the contrary.
To the eighties in 20th century, China's cut-off wall material has had great innovation.Flexible materials for walls such as plastic concrete, self-solidifying mortar constantly come out.The materials for wall of this class flexibility is because of containing clay, flyash, water glass and other admixture, present very big plasticity after the slurry material is fixed, its ultimate compression strength lower (0.1～5MPa), Young's modulus is less than 2000MPa, be that foundation soil is more approaching around strength of wall body index and the cut-pff wall, the stressed back of body of wall is strong with the compatible deformation ability of foundation soil, is not prone to cracking.Good (the water-intake rate ω of unit≤10 of anti-permeability performance in addition -6Cm/s), construction costs is lower (120～400 yuan/m 2), compare with the rigidity materials for wall, as the body of wall of antiseepage, flexible materials for wall has very big development potentiality merely.
The plastic concrete cut-pff wall it become wall technology to be: in groove section digging process, inject retaining wall with mud (also being referred to as stable liquid) in groove; When the grooving end of job, by pumping into method the plastic concrete mixture is sent in the groove, and the existing mud in the groove is replaced.The plastic concrete cut-pff wall is complex process not only, can not utilize existing mud in the groove, slurry material preparation cost height, and the mud waste is serious, and groove section quality of connection is relatively poor.
Self-solidifying mortar cut-pff wall is that in the underground diaphragm wall digging process, it plays slurry coat method with cement, wilkinite, retardant and the formulated a kind of slurries of water, and after the slotted eye excavation was finished, slurries condensed into low intensive flexible body of wall voluntarily.Because the uncertainty of antiseepage wall chase section digging time has not often been excavated in the unit groove section, condensation cure has taken place in mortar in the groove.Therefore, self-solidifying mortar cut-pff wall is not easy to site operation, and materials for wall is impervious relatively poor.
Summary of the invention
One of purpose of the present invention is to provide a kind of low cost, pollution-free, cut-off wall slurry material that anti-permeability performance is good.
Another object of the present invention provides the simple cut-pff wall wall building technique of a kind of technology.
The technical scheme that realizes the present invention's first purpose is: a kind of cut-off wall slurry material comprises retaining wall mud and the original mortar of curing; Wherein retaining wall has following components by part by weight with mud: 30～150 parts of swelling scholar or clays, 1～12 part of soda ash, 0.1～1.5 part of selective flocculant, 0.5～8.0 part of water retaining, 860～980 parts in water; Solidify and have following components by part by weight: 180～400 parts of silicate cements, 100～500 parts of sands, 25～120 parts in flyash, 16～80 parts of water glass, 0.2～2.0 part of the poly-type water reducer of resistance, 0.1～1.0 part of linking agent, 80～240 parts in water with original mortar.Water glass component wherein adds at twice: add 40%～60%, remaining 60%～40% during the preparation mortar and add after the pore-creating of groove section finishes.
Described retaining wall is 0.5: 1～0.9: 1 with mud with the mixed volume ratio that solidifies with original mortar unit prescription.
Described retaining wall with the selective flocculant in the mud be molecular weight greater than 1,500,000, the hydro-polyacrylamide of degree of hydrolysis about 30%; Water retaining is CMC (Sodium Carboxymethyl Cellulose) BP/USP or hydrolyzed polyacrylonitrile.Described curing is naphthalenesulfonate polycondensate or iron network sulfonated lignin with the poly-type water reducer of the resistance in the original mortar; Linking agent is an inorganic aluminate, preferably sulfuric acid aluminium.
The technical scheme that realizes another purpose of the present invention is: a kind of wall building technique is characterized in that having following steps:
1. in the unit groove section digging process of cut-pff wall, in groove, inject retaining wall mud;
2. in the trenching construction latter stage of unit groove section, progressively in the groove in the mud admixture solidify and use original mortar, realize when the chute forming machine digging in the groove that existing mud and curing are with the first mixing of original mortar; Described retaining wall has following components by part by weight with mud: 30～150 parts of wilkinite or clays, 1～12 part of soda ash, 0.1～1.5 part of selective flocculant, 0.5～8.0 part of water retaining, 860～980 parts in water; Described curing has following components by part by weight with original mortar: 180～400 parts of silicate cements, 100～500 parts of sands, 25～120 parts in flyash, 8～40 parts of water glass, 0.2～2.0 part of the poly-type water reducer of resistance, 0.1～1.0 part of linking agent, 80～240 parts in water;
3. after the pore-creating of groove section finishes, add 8～40 parts of water glass again, the final uniform mixing of all slurries in mechanical stirring or pressurized air stir back realization groove forms the body of wall of cut-pff wall in condensation cure in the time.Described condensation cure time≤24h.
Positively effect of the present invention is: (1) is of the present invention thisly to be compared with present existing same type of material (plastic concrete) with the flexible barrier wall new wall materials of mud based on retaining wall, the waste mud of its grooving operation need not discharging, on-the-spot disposal is made wall, have strong, ultimate compression strength of good barrier performance, time of coagulation controllability and Young's modulus and suit, have better erosion-resisting characteristics and low and pollution-free with compatible deformation ability, stable long-term strength, the cost of ground, mortar curing system is stirred wall building technique and is convenient to execute-in-place, and the scope of application is extensive.(2) curing of the present invention with adopt in the original mortar inorganic aluminate particularly Tai-Ace S 150 because it can play crosslinked coagulation to polyacrylamide in the mud and hydrolyzed polyacrylonitrile, guaranteed the snappiness of body of wall as linking agent.(3) wall building technique of the present invention only adds a part of water glass when mud and mortar mix for the first time, can avoid the slurries premature set like this, after groove section pore-creating by the time finishes, adds remainder water glass again, and forms body of wall in condensation cure in the time.(4) the used mud of cut-pff wall grooving among the present invention, its performance index are: density≤1.28g/cm 3, funnel viscosity 20～50s, dynamic filtration amount≤28ml/30min, yield value 1.5～4.5Pa, ratio of dynamic shear force/yield value to plastic viscosity about 0.48, have good shear thinning behavior and Gu Bi effect.(5) performance index of the cut-off wall of the present invention's formation are: density 1.3～1.7g/cm 3, the body of wall 28d ultimate compression strength of condensing 0.3～1.5MPa, Young's modulus 50～800MPa, slip resistance 0.10～0.45MPa, the water-intake rate ω of unit≤10 -6(be equivalent to permeability coefficient is n * 10 to m/s -6～n * 10 -8Cm/s); Newly mix the mixed serum time 〉=4h that loses flowability, condensation cure time≤24h.
Embodiment
(embodiment 1)
Retaining wall is (units/m with the component and the content that do not disperse low solid phase high-quality bentonite slurry 3): wilkinite 70, soda ash 2.5, hydro-polyacrylamide 0.16, hydrolyzed polyacrylonitrile 1.5, water 940.
The component and the content that solidify with original mortar are (by making 1m 3The cut-pff wall volume calculates, units/m 3): No. 425 ordinary Portland cements 240, sand 120, flyash 35, water glass 20, naphthalenesulfonate polycondensate 1.2, Tai-Ace S 150 0.3, water 108.
Use 0.6m 3Retaining wall with mud and 1m 3Curing mix with original mortar (unit prescription) and can produce 1m 3Cut-pff wall.Concrete making step is: in the unit groove section digging process of cut-pff wall, inject retaining wall mud in groove; In the trenching construction art phase of unit groove section, progressively in the groove in the mud admixture solidify and use original mortar, realize that when the chute forming machine digging curing mixes with the first of mud with retaining wall in the groove with original mortar; Retaining wall with the component and the content of mud is: wilkinite 70kg, soda ash 2.5kg, hydro-polyacrylamide 0.16kg, hydrolyzed polyacrylonitrile 1.5kg, water 940kg.The component and the content that solidify with original mortar are: No. 425 ordinary Portland cement 240kg, sand 120kg, flyash 35kg, water glass 8kg, naphthalenesulfonate polycondensate 1.2kg, Tai-Ace S 150 0.3kg, water 108kg.
After the pore-creating of groove section finishes, in groove, add remaining 12kg water glass, inhale anti-circulation by pump and add the final uniform mixing that compressed air mixer is realized all slurries in the groove, condensation cure forms cut-off wall in 24 hours.
But the pump phase of the mixed solution of present embodiment is 60min, and the presetting period is 8 hours 50 minutes, and final set set time is 21 hours 15 minutes, the body of wall 7d ultimate compression strength of condensing is 0.158MPa, 14d ultimate compression strength is 0.30MPa, and 28d ultimate compression strength is 0.39MPa, and the permeability coefficient of 28d is 4.6 * 10 -7Cm/s.
(embodiment 2)
Retaining wall sees Table 1 with mud and the component and the consumption that solidify with original mortar, and wall building technique is substantially the same manner as Example 1, hydrated glass 10kg when difference is to mix for the first time, and remaining 10kg water glass adds at twice.The mixed solution parameter sees Table 2.
(embodiment 3)
Retaining wall sees Table 1 with mud and the component and the consumption that solidify with original mortar, and wall building technique is substantially the same manner as Example 1, hydrated glass 10kg when difference is to mix for the first time, and remaining 15kg water glass adds at twice.The mixed solution parameter sees Table 2.
Curing mortar cut-pff wall of the present invention becomes the wall thickness degree to be generally 15～150cm, and its bottom should embed 0.5～1.0m in basement rock or the watertight layer, becomes the darkest 60m that reaches of the wall degree of depth.
Table 1
Table 2
Embodiment 1 Embodiment 2 Embodiment 3
But the pump phase (min) 60 70 65
Presetting period 8 hours 50 minutes 9 hours 30 minutes 9 hours 20 minutes
The condensation cure time 21 hours 15 minutes 21 hours 45 minutes 21 hours 10 minutes
7d ultimate compression strength (MPa) 0.158 0.428 0.412
14d ultimate compression strength (MPa) 0.30 0.579 0.475
28d ultimate compression strength (MPa) 0.39 0.695 0.585
The permeability coefficient of 28d (cm/s) 4.6×10 -7 5.7×10 -7 5.3×10 -7

Claims (6)

1, a kind of cut-off wall slurry material is characterized in that: it comprises retaining wall mud and the original mortar of curing;
Wherein retaining wall has following components by part by weight with mud: 30～150 parts of wilkinite or clays, 1～12 part of soda ash, 0.1～1.5 part of selective flocculant, 0.5～8.0 part of water retaining, 860～980 parts in water;
Solidify and have following components by part by weight: 180～400 parts of silicate cements, 100～500 parts of sands, 25～120 parts in flyash, 16～80 parts of water glass, 0.2～2.0 part of the poly-type water reducer of resistance, 0.1～1.0 part of linking agent, 80～240 parts in water with original mortar;
Described retaining wall is 0.5: 1～0.9: 1 with mud with the mixed volume ratio that solidifies with original mortar unit prescription.
2, cut-off wall slurry material according to claim 1 is characterized in that: described retaining wall is a hydro-polyacrylamide with the selective flocculant in the mud; Water retaining is CMC (Sodium Carboxymethyl Cellulose) BP/USP or hydrolyzed polyacrylonitrile.
3, cut-off wall slurry material according to claim 1 is characterized in that: described curing is naphthalenesulfonate polycondensate or iron network sulfonated lignin with the poly-type water reducer of the resistance in the original mortar; Linking agent is an inorganic aluminate.
4, cut-off wall slurry material according to claim 3 is characterized in that: described inorganic aluminate is a Tai-Ace S 150.
5, a kind of cut-pff wall wall building technique is characterized in that having following steps:
1. in the unit groove section digging process of cut-pff wall, in groove, inject retaining wall mud;
2. in the trenching construction latter stage of unit groove section, progressively in the groove in the mud admixture solidify and use original mortar, realize when the chute forming machine digging in the groove that existing mud and curing are with the first mixing of original mortar; Described retaining wall has following components by part by weight with mud: 30～150 parts of wilkinite or clays, 1～12 part of soda ash, 0.1～1.5 part of selective flocculant, 0.5～8.0 part of water retaining, 860～980 parts in water; Described curing has following components by part by weight with original mortar: 180～400 parts of silicate cements, 100～500 parts of sands, 25～120 parts in flyash, 8～40 parts of water glass, 0.2～2.0 part of the poly-type water reducer of resistance, 0.1～1.0 part of linking agent, 80～240 parts in water; Described retaining wall is 0.5: 1～0.9: 1 with mud with the mixed volume ratio that solidifies with original mortar unit prescription;
3. after the pore-creating of groove section finishes, add 8～40 parts of water glass again, the final uniform mixing of all slurries in mechanical stirring or pressurized air stir back realization groove forms the body of wall of cut-pff wall in condensation cure in the time.
6, wall building technique according to claim 5 is characterized in that: step 3. described in condensation cure time≤24h.
CNB2007100240946A 2007-07-16 2007-07-16 Cut-off wall slurry material and wall building technique Expired - Fee Related CN100516133C (en)

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