CN116639931A - Concrete material for overhead tunnel and preparation method and application thereof - Google Patents
Concrete material for overhead tunnel and preparation method and application thereof Download PDFInfo
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- CN116639931A CN116639931A CN202310613800.XA CN202310613800A CN116639931A CN 116639931 A CN116639931 A CN 116639931A CN 202310613800 A CN202310613800 A CN 202310613800A CN 116639931 A CN116639931 A CN 116639931A
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- 239000004567 concrete Substances 0.000 title claims abstract description 48
- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000839 emulsion Substances 0.000 claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 239000004927 clay Substances 0.000 claims abstract description 24
- 229920001410 Microfiber Polymers 0.000 claims abstract description 23
- 239000004734 Polyphenylene sulfide Substances 0.000 claims abstract description 23
- 239000003658 microfiber Substances 0.000 claims abstract description 23
- 229920000069 polyphenylene sulfide Polymers 0.000 claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 19
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 16
- 239000004088 foaming agent Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000013329 compounding Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 26
- 239000011268 mixed slurry Substances 0.000 claims description 15
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 12
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 10
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 10
- 125000002091 cationic group Chemical group 0.000 claims description 10
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 6
- 239000010802 sludge Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 239000003469 silicate cement Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000004574 high-performance concrete Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000009210 therapy by ultrasound Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011165 3D composite Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229920006253 high performance fiber Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- 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
- C04B14/06—Quartz; Sand
-
- 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
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
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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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2623—Polyvinylalcohols; Polyvinylacetates
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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)
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- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete material for an overhead tunnel, and a preparation method and application thereof, and belongs to the technical field of high-performance concrete and manufacturing. The concrete material of the invention is prepared from the following raw materials: silt ceramsite, machine-made sand, powdery clay, cement, fly ash, polyphenylene sulfide microfiber, composite modified emulsion, water reducer, foaming agent and water; wherein the composite modified emulsion is prepared by compounding and blending EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion. The concrete prepared by the process has high compressive and flexural strength, high slump and excellent impermeability and wear resistance, can meet the high performance requirements of the concrete for the overhead bridge and the subway tunnel, and has good practicability.
Description
Technical Field
The invention belongs to the technical field of high-performance concrete and manufacturing, and particularly relates to a concrete material for an overhead tunnel, and a preparation method and application thereof.
Background
With the economic development, urban population of China is increased, and traffic jam becomes a common problem facing each large city at present. Building an overhead and developing subways is a feasible way for relieving and improving traffic jam: overhead construction of the viaduct avoids intersection with ground roads in a three-dimensional crossing mode, and reasonable overhead layout can optimize space utilization, so that large traffic and rapid traffic are possible on the existing roads with limited width; the subway is generally arranged in an underground tunnel, the road rights are special, no plane intersection exists, and the subway is an independent traffic system, is not influenced by the condition of ground roads, and has the advantages of high efficiency, no pollution and large traffic volume.
Urban viaducts are restricted by a plurality of factors: firstly, in order to reduce bridge length and ramp length, the height is required to be selected as small as possible, a larger span is obtained under a certain pier height, in addition, the larger width span is required to improve the traffic flow, and new structures such as a bent bridge, a sloping bridge and an inclined bridge are increased, so that the bridge deck is stressed in a complex manner, and the performance requirement is greatly improved. The subway tunnel is mostly located underground, and mainly adopts an integral concrete ballast bed, so that the subway tunnel has the characteristics of neatness, attractiveness and convenience in maintenance, but the load and stress difference transferred to the ballast bed surface are obvious due to uneven settlement of the roadbed caused by various factors, so that the durability and the service life of the subway tunnel are greatly influenced.
In view of the above, in order to adapt to the high-speed development of urban traffic, it is of great importance to research a high-performance concrete material suitable for overhead bridges and subway tunnels.
Disclosure of Invention
Aiming at the problems mentioned in the background art, the invention provides a concrete material for an overhead tunnel, and a preparation method and application thereof. The aggregate of the concrete aggregate is selected from silt ceramsite, machine-made sand, powdery clay and the like, and is doped with polyphenylene sulfide microfiber and modified emulsion for coordinating the compounding of EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion, so that the strength and stability of the concrete material are greatly improved, and the high-performance requirements of the concrete for the overhead bridge and subway tunnels can be met.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a concrete material for an overhead tunnel, which is prepared from the following raw materials in parts by weight:
290-420 parts of silt ceramsite,
160-240 parts of machine-made sand,
70-85 parts of powdery clay,
95-150 parts of cement,
50-70 parts of fly ash,
40-65 parts of polyphenylene sulfide microfiber,
15-32 parts of composite modified emulsion,
5-7 parts of water reducer,
3-6 parts of foaming agent,
60-90 parts of water;
wherein the composite modified emulsion is prepared by compounding and blending EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion.
Preferably, the concrete material comprises the following preparation raw materials in parts by weight:
360 parts of silt ceramsite,
200 parts of machine-made sand,
80 parts of powdery clay,
115 parts of cement,
60 parts of fly ash,
52 parts of polyphenylene sulfide microfiber,
26 parts of composite modified emulsion,
6 parts of water reducer,
4 parts of foaming agent,
72 parts of water.
Preferably, the sludge ceramsite is a biological porous ceramsite prepared from sludge, the particle size range is 10-25mm, and the bulk density is 360-400kg/m 3 The compressive strength is not lower than 1.8MPa.
The main raw materials adopted by the concrete comprise silt ceramsite, machine-made sand, powdery clay, cement and fly ash. Firstly, the high-strength silt ceramsite is selected as the aggregate of the concrete, so that the matching relation between the volume weight and the strength of the concrete can be coordinated, the defect of heavy weight of the conventional concrete is effectively overcome, and the requirements of bridge deck span and wide span can be met; secondly, the silt ceramsite, the machine-made sand and the powdery clay are mixed and doped, and the compactness of the concrete can be effectively improved by combining the silt ceramsite, the machine-made sand and the powdery clay, the permeation and the reaction of the silt ceramsite, the machine-made sand and the powdery clay can also counteract the defect of larger shrinkage of the concrete in the later period.
Preferably, the fineness modulus of the machine-made sand is 2.5-3.0; the powder clay has plasticity index of 15-17 and clay content of 45%.
Preferably, the polyphenylene sulfide microfibers are 6-9mm long and 20-40 μm in diameter.
Preferably, the preparation method of the composite modified emulsion comprises the following steps: mixing EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion, stirring, adding cationic hydroxyethyl cellulose and aminopropyl trimethoxy silane, heating to 70deg.C, ultrasonic treating for 15min, and stirring to obtain composite modified emulsion.
Preferably, the composite modified emulsion is prepared from the following raw materials in parts by weight: 50 parts of EVA emulsion, 14-25 parts of polyvinyl acetate emulsion, 5-12 parts of fluorosilicone emulsion, 3-7 parts of cationic hydroxyethyl cellulose and 2-4 parts of aminopropyl trimethoxy silane.
Preferably, the water reducer is a high-performance polycarboxylate water reducer, the solid content is 20%, and the water reducing rate is 30%; the cement is ordinary 42.5-grade silicate cement.
The invention adopts a raw material system of the composite aggregate and the polyphenylene sulfide microfiber, the polyphenylene sulfide microfiber is a high-performance fiber with excellent mechanical property, chemical resistance and thermal property, and the polyphenylene sulfide microfiber is doped into the composite aggregate to play a role in homogenizing concrete load, so that the performances of compression resistance, fracture resistance, bearing and the like of the concrete material are greatly improved; the invention also adopts a composite modified emulsion, which is compounded and blended mainly by EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion, on one hand, the invention can further improve the water resistance and acid and alkali resistance of concrete, on the other hand, the invention can promote the selected composite aggregate and polyphenylene sulfide microfiber to construct a multi-element three-dimensional composite structure, greatly improve the compact compression resistance of the concrete, and has stable structure and high strength after the concrete is molded.
The invention also provides a preparation method of the concrete material for the overhead tunnel, which comprises the following steps:
1) Weighing the raw materials for standby according to the dosage of the formula, mixing the silt ceramsite, the machine-made sand, the powdery clay, the cement and the fly ash, and fully and uniformly stirring;
2) Adding a water reducing agent and 1/2 of water into the mixed material obtained in the step 1), uniformly stirring, then continuously slowly pouring the composite modified emulsion and the residual water into the mixed material, and continuously stirring to obtain mixed slurry;
3) And (3) adding polyphenylene sulfide microfibers into the mixed slurry obtained in the step (2), continuously and slowly stirring, adding a foaming agent into the mixed slurry, and finally fully stirring.
The concrete material prepared by the method can be applied to overhead bridges and subway tunnels.
Compared with the prior art, the invention has the beneficial effects that:
aiming at overpasses and subway tunnels with complex stress, the invention reasonably optimizes sludge ceramsite, machine-made sand, powdery clay and the like as aggregate, simultaneously mixes polyphenylene sulfide microfiber and modified emulsion for coordinating EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion to compound, prepares the concrete material with high strength and high stability, and the prepared concrete has stable structure, high strength and good compactness after being molded, can homogenize load and meets the high performance requirement of the overpass and subway tunnel concrete.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described in the following examples. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the test of the present invention: the silt ceramsite is commercially available, has a particle size of 10-25mm and a bulk density of 385kg/m 3 Compressive strength 2.2MPa; the machine-made sand is commercially available and has a fineness modulus of 2.7; the silty clay used was of commercial origin and had a plasticity index of 17 and a cosmid content of 45%; the cement used is ordinary 42.5-grade silicate cement; the specific surface area of the fly ash is about 380m 2 Per kg, density of 2.3g/m 3 3.43% loss on ignition; the length of the polyphenylene sulfide microfiber is 6-9mm, and the diameter is 20-40 mu m; EVA emulsion (commercial BJ-707) with solid content of 54.5%, polyvinyl acetate emulsion (commercial JYS 15445) with solid content of 50%, and fluorosilicone emulsion (commercial SD-5681) with solid content of 48%; the water reducer is a commercially available high-performance polycarboxylate water reducer, the solid content is 20%, and the water reducing rate is 30%; the foaming agent is a composite foam foaming agent; the water is tap water.
Example 1
A method for preparing an overhead tunnel concrete material, comprising:
1. 50 parts of EVA emulsion, 16 parts of polyvinyl acetate emulsion, 10 parts of fluorosilicone emulsion, 5 parts of cationic hydroxyethyl cellulose and 3 parts of aminopropyl trimethoxy silane are taken according to parts by weight for standby, the EVA emulsion, the polyvinyl acetate emulsion and the fluorosilicone emulsion are mixed and stirred uniformly, the cationic hydroxyethyl cellulose and the aminopropyl trimethoxy silane are added, the temperature is raised to 70 ℃ for ultrasonic treatment for 15min, and the mixture is stirred uniformly continuously to obtain the composite modified emulsion.
2. 360 parts of silt ceramsite, 200 parts of machine-made sand, 80 parts of powdery clay, 115 parts of cement, 60 parts of fly ash, 52 parts of polyphenylene sulfide microfiber, 26 parts of the prepared composite modified emulsion, 6 parts of a water reducing agent, 4 parts of a foaming agent and 72 parts of water are taken according to parts by weight for standby, and the silt ceramsite, the machine-made sand, the powdery clay, the cement and the fly ash are mixed and fully and uniformly stirred; adding a water reducing agent and 1/2 of water into the obtained mixed material, uniformly stirring, then continuously slowly pouring the composite modified emulsion and the residual water into the mixed material, and continuously stirring to obtain mixed slurry; and adding the polyphenylene sulfide microfibers into the mixed slurry, continuously and slowly stirring, adding a foaming agent into the mixed slurry, and finally fully stirring the mixture.
Example 2
A method for preparing an overhead tunnel concrete material, comprising:
1. 50 parts of EVA emulsion, 25 parts of polyvinyl acetate emulsion, 5 parts of fluorosilicone emulsion, 3 parts of cationic hydroxyethyl cellulose and 3 parts of aminopropyl trimethoxy silane are taken according to parts by weight for standby, the EVA emulsion, the polyvinyl acetate emulsion and the fluorosilicone emulsion are mixed and stirred uniformly, the cationic hydroxyethyl cellulose and the aminopropyl trimethoxy silane are added, the temperature is raised to 70 ℃ for ultrasonic treatment for 15min, and the mixture is stirred uniformly continuously to obtain the composite modified emulsion.
2. According to the weight portions, 290 portions of silt ceramsite, 240 portions of machine-made sand, 70 portions of powdery clay, 115 portions of cement, 70 portions of fly ash, 65 portions of polyphenylene sulfide microfiber, 15 portions of the prepared composite modified emulsion, 6 portions of water reducer, 4 portions of foaming agent and 72 portions of water are taken for standby, and the silt ceramsite, the machine-made sand, the powdery clay, the cement and the fly ash are mixed and fully and uniformly stirred; adding a water reducing agent and 1/2 of water into the obtained mixed material, uniformly stirring, then continuously slowly pouring the composite modified emulsion and the residual water into the mixed material, and continuously stirring to obtain mixed slurry; and adding the polyphenylene sulfide microfibers into the mixed slurry, continuously and slowly stirring, adding a foaming agent into the mixed slurry, and finally fully stirring the mixture.
Example 3
A method for preparing an overhead tunnel concrete material, comprising:
1. 50 parts of EVA emulsion, 14 parts of polyvinyl acetate emulsion, 12 parts of fluorosilicone emulsion, 6 parts of cationic hydroxyethyl cellulose and 2 parts of aminopropyl trimethoxy silane are taken according to parts by weight for standby, the EVA emulsion, the polyvinyl acetate emulsion and the fluorosilicone emulsion are mixed and stirred uniformly, the cationic hydroxyethyl cellulose and the aminopropyl trimethoxy silane are added, the temperature is raised to 70 ℃ for ultrasonic treatment for 15min, and the mixture is stirred uniformly continuously to obtain the composite modified emulsion.
2. 420 parts of silt ceramsite, 160 parts of machine-made sand, 85 parts of powdery clay, 115 parts of cement, 50 parts of fly ash, 40 parts of polyphenylene sulfide microfiber, 32 parts of the prepared composite modified emulsion, 6 parts of a water reducing agent, 4 parts of a foaming agent and 72 parts of water are taken according to parts by weight for standby, and the silt ceramsite, the machine-made sand, the powdery clay, the cement and the fly ash are mixed and fully and uniformly stirred; adding a water reducing agent and 1/2 of water into the obtained mixed material, uniformly stirring, then continuously slowly pouring the composite modified emulsion and the residual water into the mixed material, and continuously stirring to obtain mixed slurry; and adding the polyphenylene sulfide microfibers into the mixed slurry, continuously and slowly stirring, adding a foaming agent into the mixed slurry, and finally fully stirring the mixture.
Comparative example 1
This comparative example refers to the step parameters of example 1, except that the preparation raw material system of the composite modified emulsion was modified as follows:
50 parts of EVA emulsion, 16 parts of polyvinyl acetate emulsion and 3 parts of aminopropyl trimethoxy silane are taken according to parts by weight for standby, the EVA emulsion and the polyvinyl acetate emulsion are mixed and stirred uniformly, the aminopropyl trimethoxy silane is added, the temperature is raised to 70 ℃ for ultrasonic treatment for 15min, and the mixture is stirred uniformly continuously to obtain composite modified emulsion; the composite modified emulsion prepared in this comparative example was equally replaced for step 2.
Comparative example 2
This comparative example refers to the procedure parameters of example 1, except that instead of the polyphenylene sulfide microfibers employed in step 2, steel fibers having a length of 6-9mm, a diameter of 20-40 μm and a tensile strength exceeding 2000MPa were employed.
Comparative example 3
The comparative example refers to the procedure parameters of example 1, except that the composite aggregate system of the concrete material was adjusted, specifically, 440 parts by weight of shale ceramsite (particle size range 10-30mm, bulk density 336kg/m 3 Compressive strength 2.2 MPa), machine-made sand 200 parts, cement 115 parts and fly ash 60 parts; the other raw materials are unchanged.
Concrete material samples prepared in examples 1 to 3 of the present invention and comparative examples 1 to 3 were tested according to GB/T50080, GB/T50081, GB/T50082 and JTG E30 related standards, and the results are shown in the following table.
TABLE 1
As shown by the detection results in Table 1, the concrete material prepared by the process has high compression resistance, flexural strength and slump, good impermeability and wear resistance, strong internal viscosity of the concrete, uniform internal after molding, more stable structure, greatly improved strength and stability of bridge decks and road bed surfaces, and effectively prolonged service life.
The embodiments described above represent only a few preferred embodiments of the present invention, which are described in more detail and are not intended to limit the present invention. It should be noted that various changes and modifications can be made to the present invention by those skilled in the art, and any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principle of the present invention are included in the scope of the present invention.
Claims (10)
1. The concrete material for the overhead tunnel is characterized by comprising the following raw materials in parts by weight:
290-420 parts of silt ceramsite,
160-240 parts of machine-made sand,
70-85 parts of powdery clay,
95-150 parts of cement,
50-70 parts of fly ash,
40-65 parts of polyphenylene sulfide microfiber,
15-32 parts of composite modified emulsion,
5-7 parts of water reducer,
3-6 parts of foaming agent,
60-90 parts of water;
wherein the composite modified emulsion is prepared by compounding and blending EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion.
2. The concrete material for an overhead tunnel according to claim 1, wherein the concrete material comprises the following preparation raw materials in parts by weight:
360 parts of silt ceramsite,
200 parts of machine-made sand,
80 parts of powdery clay,
115 parts of cement,
60 parts of fly ash,
52 parts of polyphenylene sulfide microfiber,
26 parts of composite modified emulsion,
6 parts of water reducer,
4 parts of foaming agent,
72 parts of water.
3. The concrete material for overhead tunnels according to claim 1, wherein the sludge ceramsite is a bio-porous ceramsite prepared from sludge, and has a particle size ranging from 10 to 25mm and a bulk density ranging from 360 to 400kg/m 3 The compressive strength is not lower than 1.8MPa.
4. The concrete material for an overhead tunnel according to claim 1, wherein the machine-made sand fineness modulus is 2.5 to 3.0; the powder clay has plasticity index of 15-17 and clay content of 45%.
5. The concrete material for overhead tunnels according to claim 1, wherein the polyphenylene sulfide microfibers have a length of 6 to 9mm and a diameter of 20 to 40 μm.
6. The concrete material for overhead tunnels according to claim 1, wherein the preparation method of the composite modified emulsion comprises the following steps: mixing EVA emulsion, polyvinyl acetate emulsion and fluorosilicone emulsion, stirring, adding cationic hydroxyethyl cellulose and aminopropyl trimethoxy silane, heating to 70deg.C, ultrasonic treating for 15min, and stirring to obtain composite modified emulsion.
7. The concrete material for the overhead tunnel according to claim 6, wherein the composite modified emulsion is prepared from the following raw materials in parts by weight: 50 parts of EVA emulsion, 14-25 parts of polyvinyl acetate emulsion, 5-12 parts of fluorosilicone emulsion, 3-7 parts of cationic hydroxyethyl cellulose and 2-4 parts of aminopropyl trimethoxy silane.
8. The concrete material for an overhead tunnel according to claim 1, wherein the water reducing agent is a high-performance polycarboxylate water reducing agent having a solid content of 20% and a water reducing rate of 30%; the cement is ordinary 42.5-grade silicate cement.
9. A method for preparing a concrete material for an overhead tunnel according to any one of claims 1 to 8, comprising the steps of:
1) Weighing the raw materials for standby according to the dosage of the formula, mixing the silt ceramsite, the machine-made sand, the powdery clay, the cement and the fly ash, and fully and uniformly stirring;
2) Adding a water reducing agent and 1/2 of water into the mixed material obtained in the step 1), uniformly stirring, then continuously slowly pouring the composite modified emulsion and the residual water into the mixed material, and continuously stirring to obtain mixed slurry;
3) And (3) adding polyphenylene sulfide microfibers into the mixed slurry obtained in the step (2), continuously and slowly stirring, adding a foaming agent into the mixed slurry, and finally fully stirring.
10. The application of the concrete material obtained by the preparation method of claim 9 in viaducts and subway tunnels.
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