CN117049847A - Deep foundation pit supporting concrete and construction process thereof - Google Patents
Deep foundation pit supporting concrete and construction process thereof Download PDFInfo
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- CN117049847A CN117049847A CN202311317721.0A CN202311317721A CN117049847A CN 117049847 A CN117049847 A CN 117049847A CN 202311317721 A CN202311317721 A CN 202311317721A CN 117049847 A CN117049847 A CN 117049847A
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- 239000004567 concrete Substances 0.000 title claims abstract description 71
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000010881 fly ash Substances 0.000 claims description 21
- 239000003638 chemical reducing agent Substances 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 12
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- 239000010440 gypsum Substances 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 8
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 8
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 8
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 239000000176 sodium gluconate Substances 0.000 claims description 3
- 229940005574 sodium gluconate Drugs 0.000 claims description 3
- 235000012207 sodium gluconate Nutrition 0.000 claims description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004327 boric acid Substances 0.000 claims description 2
- 235000010338 boric acid Nutrition 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 235000013379 molasses Nutrition 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 8
- 239000002440 industrial waste Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000740 bleeding effect Effects 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
-
- 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
- C04B2201/50—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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of cement-based building materials, in particular to deep foundation pit supporting concrete and a construction process thereof, wherein an active admixture is adopted to replace part of cement to be used as a cementing material together, and recycled coarse aggregate, carbonized steel slag fine aggregate and ground iron tailing sand are added to be used as aggregates, so that the recycling of large amount of industrial wastes is realized, and in order to meet the construction requirements of the deep foundation pit supporting concrete, the influence of solid waste aggregates on the concrete construction performance and impermeability is regulated and controlled by adopting a compound additive, so that the deep foundation pit supporting concrete with low cost, dispersion resistance and high impermeability is prepared, and the engineering requirements are met.
Description
Technical Field
The invention relates to the technical field of cement-based building materials, in particular to deep foundation pit supporting concrete and a construction process thereof.
Background
Along with the development and utilization of urban underground space, deep foundation pit supporting technology is also continuously developed and innovated, such as gravity supporting structures, non-medium gravity supporting structures, slope stabilizing supporting structures and the like, wherein the underground continuous wall can be used for the deep foundation pit supporting structures due to high strength and high rigidity, and can be used as a part of underground engineering after adopting certain structural measures, so that the engineering cost is reduced, and the underground continuous wall is often adopted by engineering.
The prior art CN103321246A discloses a foundation pit construction method adopting an underground diaphragm wall, the CN106368219A provides a supporting and reinforcing structure and a construction method of a deep foundation pit, the supporting and reinforcing structure comprises a building, a foundation pit, a supporting structure and a plurality of isolation piles, the CN108585673A discloses steel fiber ceramsite lightweight aggregate concrete for supporting the deep foundation pit and a preparation method thereof, the CN115059070A discloses a construction method of a foundation pit supporting pile without collapse stratum based on solid waste utilization, the CN111236316A discloses a mounting and pouring process of a prefabricated reinforced concrete inspection well, however, the improvement of the underground diaphragm wall in the prior art is mostly innovated aiming at the construction process or structure, the innovation of mass building materials used by the construction method is less, the concrete is used as a common material for supporting the deep foundation pit, a large amount of natural raw materials are adopted in the production process, the cost is high, and the technology for preparing the concrete for supporting the deep foundation pit by utilizing industrial wastes is worth discussing.
The method is characterized in that a large amount of construction waste is generated in the engineering construction process, the construction waste is used for preparing recycled aggregate, steel slag is a large amount of solid waste generated in the steel smelting process, the activity is poor, free calcium oxide contained in the waste is restricted to be recycled, iron tailings are waste generated in the iron ore production process, the particle size of the waste is small, the waste belongs to the ultra-fine sand category, the surface edges and corners are large, the utilization rate is low, and the method is a research and application hot spot for the engineering industry in how to consume industrial waste in the engineering construction process.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides the deep foundation pit supporting concrete, which is prepared by adopting an active admixture to replace part of cement to be used as a cementing material together, adding recycled coarse aggregate, carbonized steel slag fine aggregate and ground iron tailing sand to be used as aggregate, recycling large amount of industrial waste, regulating and controlling the influence of solid waste aggregate on the concrete construction performance and impermeability by adopting a compound additive to meet the construction requirements of the deep foundation pit supporting concrete, and further preparing the deep foundation pit supporting concrete with low-cost anti-dispersion and high-impermeability effects meeting the engineering requirements.
Specifically, the deep foundation pit supporting concrete is prepared from the following raw materials in parts by weight: 280-330 parts of cement, 50-100 parts of fly ash, 20-50 parts of silica fume, 900-1100 parts of recycled coarse aggregate, 700-900 parts of carbonized steel slag fine aggregate, 100-200 parts of ground iron tailing sand, 12-20 parts of water reducer, 3-6 parts of sodium metasilicate, 2-5 parts of sodium aluminate, 3-5 parts of gypsum, 3-8 parts of retarder and 140-170 parts of water.
Preferably, the cement is at least one of ordinary portland cement and portland cement. The invention adopts the cement which is common in the market, and can meet engineering standards without adopting special cement with high price.
Preferably, the cement strength grade is not less than 42.5 grade.
Preferably, the fly ash is at least one of primary fly ash and secondary fly ash. The fly ash is rich in a large amount of spherical particles, can improve the flowability of concrete, fills concrete pores, is beneficial to concrete pouring, can improve the cohesion of concrete, improves the self-compaction effect and reduces the shrinkage of concrete.
Preferably, the recycled coarse aggregate is obtained by crushing and screening construction waste, and the particle size is 5-20 mm. The invention adopts the recycled coarse aggregate as the aggregate to realize the recycling of the construction waste.
Preferably, the carbonized steel slag fine aggregate is obtained by wetting steel slag and carbonizing the steel slag with carbon dioxide gas under the pressure of 0.2-0.5MPa, and the grain size of the carbonized steel slag fine aggregate is 0.5-5mm. The steel slag is industrial solid waste produced in the steelmaking process, has higher alkalinity and good wear resistance, contains free calcium oxide and has hidden danger of poor volume stability, therefore, the steel slag has smaller dosage in practical engineering, part of the steel slag is used as aggregate, and the other part of the steel slag is used as auxiliary cementing material after being ground, but the whole steel slag has small proportion in concrete.
Preferably, the fine iron tailings sand is prepared from iron tailings through shaping and screening, and the grain size is 0.1-0.5mm. The iron tailings have a large number of edges and corners in appearance, are irregular in appearance, have finer grain sizes, are easy to cause concrete bleeding in the use process, have large water demand and poor workability, and are shaped, so that the appearance of the iron tailings is improved, and the particle roundness is improved.
According to the invention, recycled coarse aggregate is used as concrete coarse aggregate, carbonized steel slag fine aggregate and ground iron tailing sand are used as fine aggregate to prepare deep foundation pit supporting concrete, and as the retaining wall slurry used in excavation exists in a deep groove in deep foundation pit supporting construction, concrete construction not only relates to underwater dispersion resistance, but also relates to factors resisting slurry invasion, and concrete cohesiveness of solid waste used as aggregate is still poor, pouring is easy to be polluted by slurry in the slurry, so that mechanical properties and failure of impermeability are generated after the concrete is mixed into the slurry.
Preferably, the water reducing agent is a polycarboxylate water reducing agent.
Preferably, the retarder is at least one of sodium gluconate, boric acid and molasses.
The invention also relates to a construction process of the deep foundation pit supporting concrete, which comprises the following steps:
1) Weighing the raw materials according to the mass parts,
2) Cement, fly ash, silica fume, recycled coarse aggregate and carbonized steel slag fine aggregate are mixed uniformly, water reducer, sodium metasilicate, sodium aluminate, gypsum, retarder and water are added to be stirred uniformly, and then finely ground iron tailing sand is added to be stirred uniformly, thus obtaining deep foundation pit supporting concrete slurry,
3) A long and narrow deep groove is excavated along the side wall of the underground structure by using a trenching device,
4) Placing the steel bar into a prefabricated steel bar cage in a deep groove,
5) And pouring deep foundation pit supporting concrete.
The deep foundation pit supporting concrete has the following technical advantages:
1. the invention adopts the fly ash and the silica fume to replace part of cement, adopts a large amount of industrial solid waste as aggregate to prepare the deep foundation pit supporting concrete, is environment-friendly, low-carbon and energy-saving,
2. the invention prepares the concrete with the mud resisting effect by adjusting the additive, overcomes the loss of the construction performance and the impervious performance caused by solid waste aggregate,
3. the concrete has excellent mechanical property, good construction effect and high impermeability, and meets the deep foundation pit support and pouring requirements.
Detailed Description
In order to characterize the technical effect of the invention, deep foundation pit supporting concrete is prepared and performance detection is performed. In the concrete forming process, in order to be more similar to the actual working condition on site, the mould is filled with slurry, the concrete is poured by using an inverted slump cone to be inserted below the slurry liquid level as a concrete chute until the slurry is completely discharged, the surface of a test piece is scraped to be flat, and the test piece is standard cured to 28d after demoulding. In the test process, the cement adopts P.O42.5 cement, the fly ash adopts primary fly ash, the water reducer adopts polycarboxylate water reducer, the gypsum adopts dihydrate gypsum, and the retarder adopts sodium gluconate.
Example 1
The deep foundation pit supporting concrete is prepared from the following raw materials in parts by weight: 290 parts of cement, 90 parts of fly ash, 30 parts of silica fume, 1100 parts of recycled coarse aggregate, 850 parts of carbonized steel slag fine aggregate, 110 parts of ground iron tailing sand, 15 parts of water reducer, 4 parts of sodium metasilicate, 4 parts of sodium aluminate, 3 parts of gypsum, 3.5 parts of retarder and 160 parts of water.
According to detection, the initial fluidity of concrete is 660mm, the fluidity of concrete is 630mm, the 28d compressive strength is 42.6MPa, and the impermeability is grade P8.
Example 2
The deep foundation pit supporting concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 70 parts of fly ash, 30 parts of silica fume, 1000 parts of recycled coarse aggregate, 780 parts of carbonized steel slag fine aggregate, 170 parts of ground iron tailing sand, 17 parts of water reducer, 6 parts of sodium metasilicate, 4 parts of sodium aluminate, 4 parts of gypsum, 5 parts of retarder and 160 parts of water.
According to detection, the initial fluidity of concrete is 680mm, the fluidity of concrete is 650mm, the 28d compressive strength is 47.5MPa, and the impermeability is grade P8.
Comparative example 1
The concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 70 parts of fly ash, 30 parts of silica fume, 1000 parts of recycled coarse aggregate, 950 parts of carbonized steel slag fine aggregate, 17 parts of water reducer, 6 parts of sodium metasilicate, 4 parts of sodium aluminate, 4 parts of gypsum, 5 parts of retarder and 160 parts of water.
Through detection, the concrete has bleeding, initial fluidity 720mm,2h fluidity 600mm,28d compressive strength 33.4MPa and impermeability grade P6.
Comparative example 2
The concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 70 parts of fly ash, 30 parts of silica fume, 1000 parts of recycled coarse aggregate, 780 parts of carbonized steel slag fine aggregate, 170 parts of ground iron tailing sand, 17 parts of water reducer, 10 parts of sodium aluminate, 4 parts of gypsum, 5 parts of retarder and 160 parts of water.
According to detection, the initial fluidity of the concrete is 650mm, the 2h fluidity is 530mm, the 28d compressive strength is 31.1MPa, and the impermeability grade is P4.
Comparative example 3
The concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 70 parts of fly ash, 30 parts of silica fume, 1000 parts of recycled coarse aggregate, 780 parts of carbonized steel slag fine aggregate, 170 parts of ground iron tailing sand, 17 parts of water reducer, 14 parts of sodium metasilicate, 5 parts of retarder and 160 parts of water.
According to detection, the initial fluidity of the concrete is 560mm, the concrete has no fluidity for 2 hours, and the concrete can not form a compact test piece in a slurry environment.
Comparative example 4
The concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 70 parts of fly ash, 30 parts of silica fume, 1000 parts of recycled coarse aggregate, 780 parts of carbonized steel slag fine aggregate, 170 parts of ground iron tailing sand, 17 parts of water reducer, 4 parts of hydroxypropyl methyl cellulose ether, 5 parts of retarder and 160 parts of water.
Through detection, the initial fluidity of the concrete is 600mm, the concrete has no fluidity in 2 hours, the 28d compressive strength is 30.2MPa, and the impermeability is grade P4.
Comparative example 5
The concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 70 parts of fly ash, 30 parts of silica fume, 1000 parts of recycled coarse aggregate, 780 parts of carbonized steel slag fine aggregate, 170 parts of ground iron tailing sand, 17 parts of water reducer, 5 parts of retarder and 160 parts of water.
Through detection, the initial fluidity of the concrete is 700mm, the fluidity of the concrete is 550mm in 2 hours, and the concrete can not form a compact test piece in a slurry environment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The deep foundation pit supporting concrete is characterized by being prepared from the following raw materials in parts by weight: 280-330 parts of cement, 50-100 parts of fly ash, 20-50 parts of silica fume, 900-1100 parts of recycled coarse aggregate, 700-900 parts of carbonized steel slag fine aggregate, 100-200 parts of ground iron tailing sand, 12-20 parts of water reducer, 3-6 parts of sodium metasilicate, 2-5 parts of sodium aluminate, 3-5 parts of gypsum, 3-8 parts of retarder and 140-170 parts of water.
2. The deep foundation pit support concrete of claim 1, wherein the cement is at least one of portland cement and portland cement.
3. The deep foundation pit support concrete of claim 1, wherein the cement strength grade is not less than grade 42.5.
4. The deep foundation pit supporting concrete of claim 1, wherein the fly ash is at least one of primary fly ash and secondary fly ash.
5. The deep foundation pit supporting concrete according to claim 1, wherein the recycled coarse aggregate is obtained by crushing and screening construction waste, and has a continuous grading of 5-20mm in particle size.
6. The deep foundation pit supporting concrete according to claim 1, wherein the carbonized steel slag fine aggregate is obtained by carbon dioxide gas carbonization under the pressure of 0.2-0.5MPa after steel slag wetting, and the grain size of the carbonized steel slag fine aggregate is 0.5-5mm.
7. The deep foundation pit support concrete of claim 1, wherein the ground iron tailings sand is prepared from iron tailings by shaping and screening, and has a particle size of 0.1-0.5mm.
8. The deep foundation pit support concrete of claim 1, wherein the water reducing agent is a polycarboxylate water reducing agent.
9. The deep foundation pit supporting concrete of claim 1, wherein the retarder is at least one of sodium gluconate, boric acid and molasses.
10. The construction process of deep foundation pit supporting concrete according to any one of claims 1 to 9, comprising the steps of:
1) Weighing the raw materials according to the mass parts,
2) Cement, fly ash, silica fume, recycled coarse aggregate and carbonized steel slag fine aggregate are mixed uniformly, water reducer, sodium metasilicate, sodium aluminate, gypsum, retarder and water are added to be stirred uniformly, and then finely ground iron tailing sand is added to be stirred uniformly, thus obtaining deep foundation pit supporting concrete slurry,
3) A long and narrow deep groove is excavated along the side wall of the underground structure by using a trenching device,
4) Placing the steel bar into a prefabricated steel bar cage in a deep groove,
5) And pouring deep foundation pit supporting concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311317721.0A CN117049847B (en) | 2023-10-12 | 2023-10-12 | Deep foundation pit supporting concrete and construction process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311317721.0A CN117049847B (en) | 2023-10-12 | 2023-10-12 | Deep foundation pit supporting concrete and construction process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN117049847A true CN117049847A (en) | 2023-11-14 |
| CN117049847B CN117049847B (en) | 2023-12-12 |
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Citations (5)
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| WO2009039232A1 (en) * | 2007-09-20 | 2009-03-26 | Nova Chemicals Inc. | Methods of placing concrete |
| CN108059373A (en) * | 2017-11-30 | 2018-05-22 | 中冶建筑研究总院有限公司 | Application of the alkali-slag cement as treatment of soft foundation material |
| CN108689670A (en) * | 2018-05-28 | 2018-10-23 | 石家庄金隅旭成混凝土有限公司 | A kind of concrete and preparation method thereof for long walling work |
| CN111719568A (en) * | 2020-05-28 | 2020-09-29 | 三明学院 | Anchor-spraying supporting method for man-cut pile retaining wall |
| CN111847994A (en) * | 2019-04-30 | 2020-10-30 | 南京梅山冶金发展有限公司 | Proportioning method of high-strength concrete for underground shotcrete support of mine |
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2023
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009039232A1 (en) * | 2007-09-20 | 2009-03-26 | Nova Chemicals Inc. | Methods of placing concrete |
| CN108059373A (en) * | 2017-11-30 | 2018-05-22 | 中冶建筑研究总院有限公司 | Application of the alkali-slag cement as treatment of soft foundation material |
| CN108689670A (en) * | 2018-05-28 | 2018-10-23 | 石家庄金隅旭成混凝土有限公司 | A kind of concrete and preparation method thereof for long walling work |
| CN111847994A (en) * | 2019-04-30 | 2020-10-30 | 南京梅山冶金发展有限公司 | Proportioning method of high-strength concrete for underground shotcrete support of mine |
| CN111719568A (en) * | 2020-05-28 | 2020-09-29 | 三明学院 | Anchor-spraying supporting method for man-cut pile retaining wall |
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| CN117049847B (en) | 2023-12-12 |
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