CN112746608A - Underground continuous wall construction method - Google Patents
Underground continuous wall construction method Download PDFInfo
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- CN112746608A CN112746608A CN202110010088.5A CN202110010088A CN112746608A CN 112746608 A CN112746608 A CN 112746608A CN 202110010088 A CN202110010088 A CN 202110010088A CN 112746608 A CN112746608 A CN 112746608A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B18/18—Waste materials; Refuse organic
- C04B18/20—Waste materials; Refuse organic from macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Processing Of Solid Wastes (AREA)
Abstract
The application relates to the technical field of foundation construction, and particularly discloses an underground continuous wall construction method, which comprises the following steps: firstly, excavating a groove at a preset position; secondly, hoisting a reinforcement cage in the groove; step three, pouring waste plastic modified concrete in the groove, repeating the step one and the step two, and curing to obtain the underground continuous wall; the waste plastic modified concrete is prepared from the following raw materials in parts by weight: cement 220-230 parts; 65-75 parts of fly ash; 70-80 parts of mineral powder; fine sand 710 and 730 parts; 980 and 990 parts of gravels; 6-8 parts of a water reducing agent; 150 portions and 160 portions of water; 100 portions of modified waste plastic particles and 120 portions of modified waste plastic particles; the modified waste plastic particles are obtained by coating curing slurry on the surfaces of the waste plastic particles and curing, wherein the curing slurry is prepared from the following raw materials in parts by weight: 40-45 parts of cement, 1-1.5 parts of cement accelerator and 25-35 parts of water. The application has the advantage of improving the anti-permeability performance and the compressive strength of the underground continuous wall.
Description
Technical Field
The application relates to the technical field of foundation construction, in particular to a construction method of an underground diaphragm wall.
Background
The underground continuous wall is a foundation engineering, and adopts a trenching machine on the ground, and under the condition of slurry wall protection, a long and narrow deep groove is excavated along the peripheral axis of the deep excavation engineering, after the groove is cleaned, a steel reinforcement cage is hung in the groove, then underwater concrete is poured by using a conduit method to construct a unit groove section, and the steps are carried out section by section, so that a continuous reinforced concrete wall is constructed underground to be used as a structure for intercepting water, preventing seepage, bearing and retaining water.
The related art discloses a construction method of an underground diaphragm wall, which comprises the following steps: a. manufacturing a round reinforcement cage according to the design width of the enclosure structure; b. excavating a long and narrow deep groove according to the design position of the building envelope; c. hoisting round reinforcement cages in the long and narrow deep grooves along the vertical direction, wherein the round reinforcement cages are arranged at equal intervals along the longitudinal direction of the long and narrow deep grooves; d. pouring common concrete in the long and narrow deep groove; e. repeating the steps b-d on the long and narrow deep groove of the next section; f. and curing to obtain the underground continuous reinforced concrete wall.
In view of the above-mentioned related art, when the constructed underground diaphragm wall needs a strong anti-permeability performance, the inventor believes that the anti-permeability performance of the general concrete needs to be improved.
Disclosure of Invention
In order to improve the impermeability of common concrete, the application provides a construction method of an underground continuous wall.
The application provides an underground diaphragm wall construction method, adopts following technical scheme:
a construction method of an underground diaphragm wall comprises the following steps:
firstly, excavating a groove at a preset position;
secondly, hoisting a reinforcement cage in the groove;
step three, pouring waste plastic modified concrete in the groove, repeating the step one and the step two, and curing to obtain the underground continuous wall; the waste plastic modified concrete is prepared from the following raw materials in parts by weight:
cement 220-230 parts;
65-75 parts of fly ash;
70-80 parts of mineral powder;
fine sand 710 and 730 parts;
980 and 990 parts of gravels;
6-8 parts of a water reducing agent;
150 portions and 160 portions of water;
100 portions of modified waste plastic particles and 120 portions of modified waste plastic particles;
the modified waste plastic particles are obtained by coating curing slurry on the surfaces of the waste plastic particles and curing, wherein the curing slurry is prepared from the following raw materials in parts by weight: 40-45 parts of cement, 1-1.5 parts of cement accelerator and 25-35 parts of water.
By adopting the technical scheme, the waste plastics has low density, and can be added into concrete only after modification treatment if the waste plastics is directly added into the concrete and has the defect of floating. According to the application, the cement curing slurry is adopted to wrap the waste plastic particles, and the cured modified waste plastic particles can replace fine sand or small-particle broken stone, so that on one hand, the curing slurry increases the density of the waste plastic particles, the condition that the waste plastic particles float upwards due to low density can be reduced, the modified waste plastic particles can be uniformly distributed in the concrete, the porosity of the concrete is reduced, and the impermeability of the concrete is improved; on the other hand, the solidified slurry improves the interface compatibility of concrete and waste plastics, reduces the possibility of separating waste plastic particles from the concrete, and improves the compressive strength of the concrete. The application recycles the waste plastics, is green and environment-friendly, and reduces the cost.
Optionally, the preparation method of the modified waste plastic particles comprises the following steps: mixing and stirring the cement, the cement accelerator and the water uniformly to obtain cured slurry; adding 100 parts of waste plastic particles into the curing slurry, uniformly mixing, taking out the waste plastic particles, separating the waste plastic particles, drying, screening, conveying the waste plastic particles with qualified particle size into a curing chamber, curing for 20-24h, then putting into tap water, curing for 40-48h, taking out, and airing to obtain the modified waste plastic particles.
By adopting the technical scheme, the cement accelerator can accelerate the cement curing speed, reduce the possibility of sagging caused by slow cement curing, improve the wrapping integrity of the waste plastic particles, and ensure that the modified waste plastic particles can be distributed more uniformly in concrete.
Optionally, the raw materials of the cured slurry further comprise 2-4 parts of a concrete interface agent.
By adopting the technical scheme, the concrete interface agent has stronger adhesive force, can improve the adhesive force between the solidified slurry and the waste plastic particles, and further reduces the possibility of separating the waste plastic particles from the solidified slurry.
Optionally, the particle size of the waste plastic particles is 4-6 mm.
By adopting the technical scheme, the particle size of the waste plastic particles is between that of the fine aggregate and that of the coarse aggregate, on one hand, the pores in the concrete can be filled, and on the other hand, when the modified waste plastic particles are produced, the solidified pulp can be convenient to wrap the waste plastic particles.
Optionally, the cured slurry has a thickness of 2-3mm after curing.
By adopting the technical scheme, when the cured slurry is too thin, the impermeability and compressive strength of the concrete can be reduced; when the cured mortar is too thick, the impermeability of the concrete is basically unchanged, and the improvement range of the compressive strength is small, so that the cured mortar is preferably 2-3mm thick.
Optionally, the waste plastic particles are pretreated prior to addition to the curing paste: the surface of the waste plastic particles is polished into a rough surface, and then the surface is subjected to corona treatment to obtain the pretreated waste plastic particles.
Through adopting above-mentioned technical scheme, because waste plastics particle surface is difficult for combining with the solidification thick liquid, through the processing back of polishing, can improve the roughness on waste plastics surface, through the corona treatment back, can improve the surface free energy, combine with the solidification thick liquid more easily for solidification thick liquid thickness is even, and solidification thick liquid is difficult for separating with waste plastics particle.
Optionally, the roughness of the rough surface is Ra3.2-Ra6.3.
By adopting the technical scheme, the value of the roughness is controlled, and the solidified slurry is favorably and uniformly coated on the surfaces of the waste plastic particles.
Optionally, the corona strength of the corona treatment is 4.0kV/cm to 4.2 kV/cm.
By adopting the technical scheme, the corona strength is controlled, so that the free energy of the surface of the waste plastic particles is improved, and the waste plastic particles are easier to combine with the solidified slurry.
In summary, the present application has the following beneficial effects:
1. because the waste plastic particles are wrapped by the cement curing slurry, the cured modified waste plastic particles can replace fine sand or small-particle broken stones, on one hand, the curing slurry increases the density of the waste plastic particles, can reduce the condition that the waste plastic particles float upwards due to low density, can be uniformly distributed in the concrete, reduces the porosity of the concrete, and improves the impermeability of the concrete; on the other hand, the solidified slurry improves the interface compatibility of concrete and waste plastics, reduces the possibility of separating waste plastic particles from the concrete, and improves the compressive strength of the concrete.
2. The application preferably adopts the polishing to process the waste plastics, can improve the roughness of the surface of the waste plastics, can improve the surface free energy after corona treatment, and is easier to combine with the curing paste, so that the thickness of the curing paste is uniform, and the curing paste is not easy to separate from the waste plastic particles.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of modified waste Plastic pellets
Preparation example 1
Modified waste plastic particles, produced by the process of: uniformly mixing and stirring 40kg of cement, 1kg of cement accelerator and 25kg of water to obtain cured slurry; adding 100kg of waste plastic particles into the curing slurry, uniformly mixing, taking out the waste plastic particles, separating the waste plastic particles, drying, screening, conveying the waste plastic particles with qualified particle size into a curing room, curing for 20h, putting into tap water, curing for 48h, taking out, and airing to obtain modified waste plastic particles.
The particle size of the waste plastic particles is 8mm, the thickness of the solidified slurry is 1mm, the cement accelerator is purchased from Jinxin chemical Co., Ltd, and the waste plastic is a waste PP material.
Preparation example 2
Modified waste plastic particles, produced by the process of: uniformly mixing and stirring 42kg of cement, 1.2kg of cement accelerator and 30kg of water to obtain cured slurry; adding 100kg of waste plastic particles into the curing slurry, uniformly mixing, taking out the waste plastic particles, separating the waste plastic particles, drying, screening, conveying the waste plastic particles with qualified particle size into a curing room, curing for 21h, then putting into tap water, curing for 45h, taking out, and airing to obtain modified waste plastic particles.
The particle size of the waste plastic particles is 8mm, the thickness of the solidified slurry is 1mm, the cement accelerator is purchased from Jinxin chemical Co., Ltd, and the waste plastic is a waste PP material.
Preparation example 3
Modified waste plastic particles, produced by the process of: uniformly mixing and stirring 45kg of cement, 1.5kg of cement accelerator and 35kg of water to obtain cured slurry; adding 100kg of waste plastic particles into the curing slurry, uniformly mixing, taking out the waste plastic particles, separating the waste plastic particles, drying, screening, conveying the waste plastic particles with qualified particle size into a curing room, curing for 24 hours, then putting into tap water, curing for 40 hours, taking out, and airing to obtain modified waste plastic particles.
The particle size of the waste plastic particles is 8mm, the thickness of the solidified slurry is 1mm, the cement accelerator is purchased from Jinxin chemical Co., Ltd, and the waste plastic is a waste PP material.
Preparation example 4
Modified waste plastic pellets were different from those of production example 1 in that the waste plastic pellets had a particle size of 2 mm.
Preparation example 5
Modified waste plastic pellets were different from those of production example 1 in that the waste plastic pellets had a particle size of 4 mm.
Preparation example 6
Modified waste plastic pellets were different from those of production example 1 in that the waste plastic pellets had a particle size of 6 mm.
Preparation example 7
Modified waste plastic pellets were different from those in production example 5 in that the cured slurry had a thickness of 2mm after curing.
Preparation example 8
Modified waste plastic pellets were different from those in production example 5 in that the cured slurry had a thickness of 3mm after curing.
Preparation example 9
Modified waste plastic pellets were different from those in production example 5 in that the cured slurry had a thickness of 4mm after curing.
Preparation example 10
Modified waste plastic pellets, different from preparation example 1, in that 40kg of cement, 1kg of cement accelerator, 25kg of water and 1kg of concrete interface agent were mixed and stirred uniformly to obtain a solidified slurry; the concrete interface agent was purchased from beijing rui sandet building materials ltd.
Preparation example 11
The modified waste plastic pellets were different from those of preparation example 10 in that 40kg of cement, 1kg of cement accelerator, 25kg of water and 2kg of concrete interface agent were mixed and stirred uniformly to obtain a cured slurry.
Preparation example 12
The modified waste plastic pellets were different from those of preparation example 10 in that 40kg of cement, 1kg of cement accelerator, 25kg of water and 4kg of concrete interface agent were mixed and stirred uniformly to obtain a cured slurry.
Preparation example 13
The modified waste plastic pellets were different from those of preparation example 10 in that 40kg of cement, 1kg of cement accelerator, 25kg of water and 6kg of concrete interface agent were mixed and stirred uniformly to obtain a cured slurry.
Preparation example 14
Modified waste plastic pellets, different from production example 10, in that modified waste plastic pellets were produced by the following method: uniformly mixing and stirring 40kg of cement, 1kg of cement accelerator and 25kg of water to obtain cured slurry; the waste plastic particles are pretreated before being added to the curing paste: the surface of waste plastic particles is polished into rough surfaces, the roughness of the rough surfaces is Ra0.8, the rough surfaces are subjected to corona treatment, the corona treatment equipment is a Schumann corona machine, the corona strength of the corona treatment is 3.8kV/cm to obtain pretreated waste plastic particles, 100kg of the pretreated waste plastic particles are added into curing slurry, the waste plastic particles are taken out after being uniformly mixed, the waste plastic particles are separated, dried and screened, the waste plastic particles with qualified particle sizes are sent into a curing chamber for curing for 20 hours, then are put into tap water for curing for 48 hours, and the waste plastic particles are taken out and dried to obtain the modified waste plastic particles.
Preparation example 15
Modified waste plastic pellets were different from those of production example 14 in that the roughness of the matte surface was ra 2.2.
Preparation example 16
Modified waste plastic pellets were different from those of production example 14 in that the roughness of the matte surface was ra 4.5.
Preparation example 17
Modified waste plastic pellets were different from those of production example 14 in that the roughness of the matte surface was ra 6.3.
Preparation example 18
Modified waste plastic particles, different from production example 14 in that the corona strength of the corona treatment was 4.0 kV/cm.
Preparation example 19
Modified waste plastic particles, different from production example 14 in that the corona strength of the corona treatment was 4.2 kV/cm.
Preparation example 20
Modified waste plastic particles, different from production example 14 in that the corona strength of the corona treatment was 4.4 kV/cm.
Preparation example 21
Modified waste plastic particles, produced by the process of: uniformly mixing and stirring 40kg of cement, 1kg of cement accelerator, 25kg of water and 2kg of concrete interface agent to obtain cured slurry; the waste plastic particles are pretreated before being added to the curing paste: the surface of waste plastic particles is polished into rough surfaces, the roughness of the rough surfaces is Ra2.2, the rough surfaces are subjected to corona treatment, the corona treatment equipment is a Schumann corona machine, the corona strength of the corona treatment is 4kV/cm, pretreated waste plastic particles are obtained, 100kg of the pretreated waste plastic particles are added into curing slurry, the waste plastic particles are taken out after being uniformly mixed, the waste plastic particles are separated, dried and screened, the waste plastic particles with qualified particle size are sent into a curing chamber for curing for 20 hours, then are put into tap water for curing for 48 hours, and are taken out and dried to obtain the modified waste plastic particles.
The particle size of the waste plastic particles is 4mm, the thickness of the solidified slurry is 2mm, the cement accelerator is purchased from Jinxin chemical company Limited in Jinan of Jinan, the concrete interface agent is purchased from Chengte building materials company Limited in Beijing Rui, and the waste plastic is a waste PP material.
Comparative preparation example 1
Modified waste plastic particles, produced by the process of: the waste PP material was crushed to a particle size of 8 mm.
Comparative preparation example 2
Modified waste plastic pellets were different from those of preparation example 1 in that no cement accelerator was added.
Examples
Example 1
A construction method of an underground diaphragm wall comprises the following steps:
firstly, excavating a groove at a preset position;
secondly, hoisting a reinforcement cage in the groove;
step three, pouring waste plastic modified concrete in the groove, repeating the step one and the step two, and curing to obtain the underground continuous wall; the waste plastic modified concrete is prepared from the following raw materials in parts by weight:
220kg of cement;
65kg of fly ash;
70kg of mineral powder;
710kg of fine sand;
980kg of crushed stones;
6kg of water reducing agent; the water reducing agent is a polycarboxylate water reducing agent and is purchased from Jinan Xu Chuang chemical technology Limited company;
150kg of water;
100kg of modified waste plastic pellets, which were obtained in production example 1.
The preparation method of the waste plastic modified concrete comprises the following steps: mixing and stirring the cement, the fly ash, the mineral powder, the fine sand, the broken stone, the water reducing agent, the water and the modified waste plastic particles uniformly.
Examples 2 to 21
A method of constructing an underground diaphragm wall, which is different from example 1 in that modified waste plastic pellets were prepared from preparation examples 2 to 21, respectively.
Example 22
A method of constructing an underground diaphragm wall, which is different from example 1 in that waste plastic modified concrete is made of raw materials comprising, by weight:
225kg of cement;
70kg of fly ash;
75kg of mineral powder;
720kg of fine sand;
985kg of broken stones;
7kg of water reducing agent;
155kg of water;
110kg of modified waste plastic particles.
Example 23
A method of constructing an underground diaphragm wall, which is different from example 1 in that waste plastic modified concrete is made of raw materials comprising, by weight:
230kg of cement;
65kg of fly ash;
80kg of mineral powder;
730kg of fine sand;
980kg of crushed stones;
8kg of water reducing agent;
160kg of water;
120kg of modified waste plastic particles.
Comparative example
Comparative examples 1 to 2
A method of constructing an underground diaphragm wall, which is different from example 1 in that modified waste plastic pellets were respectively produced by comparative preparation examples 1-2.
Comparative example 3
A method of constructing an underground diaphragm wall, which is different from example 1 in that modified waste plastic pellets are replaced with crushed stone having an equal weight and an equal particle size.
Performance test
Test method
(1) The waste plastic modified concretes of examples 1 to 23 and comparative examples 1 to 3 were taken and tested for impermeability properties according to the penetration height method in accordance with GB/T50082-2009.
(2) The waste plastic modified concrete in examples 1 to 23 and comparative examples 1 to 3 was taken and tested for compressive strength according to the test method of GB/T29062-2012.
TABLE 1 test results of waste plastic modified concrete in examples 1 to 23 and comparative examples 1 to 3
Combining examples 1-23 and comparative examples 1-3 and combining table 1, it can be seen that comparative example 1 reduces the height of impermeability from 37mm to 35mm and the compressive strength from 47.5MPa to 28.5MPa when the crushed stone is replaced with waste plastic pellets without the cured mortar coating on the basis of comparative example 3, and comparative example 2 reduces the height of impermeability from 35mm to 33mm and increases the compressive strength from 28.5MPa to 30.1MPa when the cement paste is coated on the surface of the waste plastic pellets without adding a cement accelerator on the basis of comparative example 1; the common waste plastic particles can reduce the anti-permeability height of the concrete, improve the anti-permeability performance, and simultaneously greatly reduce the compressive strength of the concrete, and the anti-permeability performance and the compressive strength of the concrete can be improved by wrapping cement paste on the surfaces of the waste plastic particles.
Example 1 after adding the cement accelerator on the basis of the comparative example 2, the anti-permeability height is reduced from 33mm to 28mm, and the compressive strength is improved from 30.1MPa to 35MPa, and examples 2-3 show the same trend as example 1, which shows that the cement accelerator can accelerate the cement curing speed, reduce the possibility that the cement is cured slowly and flows, improve the wrapping integrity of waste plastic particles, and thus improve the anti-permeability performance and compressive strength of concrete.
Example 4 compared to example 1, the particle size of the waste plastic pellets was changed from 8mm to 2mm, the height of the barrier was reduced from 28mm to 24mm, the compressive strength was increased from 35MPa to 35.2MPa, and the barrier properties were improved but the compressive strength was not increased much; example 5 compared with example 1, the particle size of the waste plastic pellets was changed from 8mm to 4mm, the height of the barrier property was reduced from 28mm to 25mm, the compressive strength was increased from 35MPa to 36.4MPa, and both the barrier property and the compressive strength were increased; example 6 compared with example 1, the particle size of the waste plastic pellets was changed from 8mm to 6mm, the height of the impermeability was reduced from 28mm to 26mm, the compressive strength was increased from 35MPa to 36.6MPa, and both the impermeability and the compressive strength were improved, indicating that the impermeability and the compressive strength of the concrete can be considered when the particle size of the waste plastic pellets was 4-6 mm.
Example 7 compared with example 1, the cured thickness of the cured slurry is changed from 1mm to 2mm, the anti-permeability height is reduced from 28mm to 23mm, the compressive strength is improved from 35MPa to 36.8MPa, and the anti-permeability performance and the compressive strength are improved; example 8 compared with example 1, the cured thickness of the cured slurry is changed from 1mm to 3mm, the impervious height is reduced from 28mm to 22mm, the compressive strength is improved from 35MPa to 37.2MPa, and the impervious performance and the compressive strength are improved; example 9 compared with example 1, the cured slurry has the cured thickness changed from 1mm to 2mm, the impervious height decreased from 28mm to 22mm, the compressive strength increased from 35MPa to 37.3MPa, and the impervious performance and the compressive strength are both improved, but example 9 compared with example 8, the compressive strength is not improved greatly; when the curing thickness of the curing slurry is 2-3mm, the impermeability and compressive strength of the concrete can be considered.
Example 10 compared with example 1, 1kg of concrete interface agent is added into the cured slurry, the anti-permeability height is reduced from 28mm to 24mm, the compressive strength is improved from 35MPa to 36.5MPa, and the anti-permeability performance and the compressive strength are both improved; compared with the example 1, the example 11 has the advantages that 2kg of concrete interface agent is added into the curing slurry, the anti-permeability height is reduced from 28mm to 22mm, the compressive strength is improved from 35MPa to 37.6MPa, and the anti-permeability performance and the compressive strength are improved; example 12 compared with example 1, the cured mortar added with 4kg of concrete interface agent has the advantages that the anti-permeability height is reduced from 28mm to 20mm, the compressive strength is increased from 35MPa to 37.6MPa, and the anti-permeability performance and the compressive strength are both improved; compared with the example 1, the example 13 has the advantages that 6kg of concrete interface agent is added into the curing slurry, the anti-permeability height is reduced from 28mm to 20mm, the compressive strength is improved from 35MPa to 37.6MPa, the anti-permeability performance and the compressive strength are improved, but the compressive strength of the example 13 is not improved compared with the example 12; the concrete interface agent can give consideration to both the impermeability and the compressive strength when the addition amount of the concrete interface agent is 2-4 kg.
Example 14 on the basis of example 1, the impermeability height was reduced from 28mm to 27mm, the compressive strength was increased from 35MPa to 37.8MPa, and both the impermeability and the compressive strength were increased by subjecting the waste plastic pellets to grinding and corona pretreatment before addition to the curing paste; example 15 on the basis of example 14, the roughness of the rough surface is improved from Ra0.8 to Ra2.2, the anti-permeability height is greatly reduced from 27mm to 22mm, the compressive strength is improved from 37.8MPa to 38.5MPa, and the anti-permeability performance and the compressive strength are improved; example 16 on the basis of example 14, the roughness of the rough surface is improved from Ra0.8 to Ra4.5, the anti-permeability height is greatly reduced from 27mm to 19mm, the compressive strength is improved from 37.8MPa to 39.2MPa, and the anti-permeability performance and the compressive strength are improved; example 17 on the basis of example 14, the roughness of the rough surface was increased from ra0.8 to ra6.3, the impermeability height was greatly reduced from 27mm to 19mm, and the compressive strength was increased from 37.8MPa to 39.3MPa, with both the impermeability and the compressive strength being improved, but the compressive strength was not greatly improved compared to example 16, indicating that the roughness of the rough surface at ra3.2 to ra6.3 can achieve both the impermeability and the compressive strength of the concrete.
Example 18 on the basis of example 14, the corona strength of corona treatment is improved from 3.8kV/cm to 4kV/cm, the impervious height is greatly reduced from 27mm to 17mm, the compressive strength is improved from 37.8MPa to 40.2MPa, and the impervious performance and the compressive strength are both improved; example 19 on the basis of example 14, the corona strength of corona treatment is improved from 3.8kV/cm to 4.2kV/cm, the impervious height is greatly reduced from 27mm to 16mm, the compressive strength is improved from 37.8MPa to 41MPa, and the impervious performance and the compressive strength are both improved; example 20 on the basis of example 14, the corona strength of the corona treatment was increased from 3.8kV/cm to 4.4kV/cm, the barrier height was greatly reduced from 27mm to 16mm, and the compressive strength was increased from 37.8MPa to 41.1MPa, both the barrier property and the compressive strength were improved, but the compressive strength was not increased much as compared with example 19, which indicates that the barrier property and the compressive strength of the concrete can be considered when the corona strength of the corona treatment is 4-4.2 kV/cm.
Example 21 based on example 1, the permeability resistance height was greatly reduced from 28mm to 10mm, the compressive strength was greatly increased from 35MPa to 46.2MPa, and both the permeability resistance and the compressive strength were greatly increased after the waste plastic particles were modified by combining the modification methods of example 5, example 7, example 11, example 15, and example 18, which shows that the modification steps and parameters in the application cooperate with each other to synergize, and the permeability resistance and the compressive strength of the concrete were significantly increased.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A construction method of an underground diaphragm wall is characterized by comprising the following steps:
firstly, excavating a groove at a preset position;
secondly, hoisting a reinforcement cage in the groove;
step three, pouring waste plastic modified concrete in the groove, repeating the step one and the step two, and curing to obtain the underground continuous wall;
the waste plastic modified concrete is prepared from the following raw materials in parts by weight:
cement 220-230 parts;
65-75 parts of fly ash;
70-80 parts of mineral powder;
fine sand 710 and 730 parts;
980 and 990 parts of gravels;
6-8 parts of a water reducing agent;
150 portions and 160 portions of water;
100 portions of modified waste plastic particles and 120 portions of modified waste plastic particles;
the modified waste plastic particles are obtained by coating curing slurry on the surfaces of the waste plastic particles and curing, wherein the curing slurry is prepared from the following raw materials in parts by weight: 40-45 parts of cement, 1-1.5 parts of cement accelerator and 25-35 parts of water.
2. A method of constructing an underground diaphragm wall according to claim 1, wherein: the preparation method of the modified waste plastic particles comprises the following steps: mixing and stirring the cement, the cement accelerator and the water uniformly to obtain cured slurry; adding 100 parts of waste plastic particles into the curing slurry, uniformly mixing, taking out the waste plastic particles, separating the waste plastic particles, drying, screening, conveying the waste plastic particles with qualified particle size into a curing chamber, curing for 20-24h, then putting into tap water, curing for 40-48h, taking out, and airing to obtain the modified waste plastic particles.
3. A method of constructing an underground diaphragm wall according to claim 1, wherein: the raw materials of the curing paste also comprise 2-4 parts of concrete interface agent.
4. A method of constructing an underground diaphragm wall according to claim 1, wherein: the particle size of the waste plastic particles is 4-6 mm.
5. The underground diaphragm wall construction method according to claim 4, wherein: the thickness of the solidified slurry after solidification is 2-3 mm.
6. A method of constructing an underground diaphragm wall according to claim 2, wherein: the waste plastic particles are pretreated before being added to the curing paste: the surface of the waste plastic particles is polished into a rough surface, and then the surface is subjected to corona treatment to obtain the pretreated waste plastic particles.
7. A method of constructing an underground diaphragm wall according to claim 6, wherein: the roughness of the rough surface is Ra2.2-Ra4.5.
8. A method of constructing an underground diaphragm wall according to claim 6, wherein: the corona intensity of the corona treatment is 4.0 kV/cm-4.2 kV/cm.
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Application publication date: 20210504 |