CN109336503A - A kind of durable anti-crack concrete in tunnel - Google Patents
A kind of durable anti-crack concrete in tunnel Download PDFInfo
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- CN109336503A CN109336503A CN201811276534.1A CN201811276534A CN109336503A CN 109336503 A CN109336503 A CN 109336503A CN 201811276534 A CN201811276534 A CN 201811276534A CN 109336503 A CN109336503 A CN 109336503A
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Medicinal Chemistry (AREA)
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- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of durable anti-crack concrete in tunnel, raw material includes: portland cement, wollastonite powder, slag powders, sand, latex powder, microlith, polypropylene fibre, carbon fiber, polyacrylonitrile fibre, ceramic fibre, poly carboxylic acid series water reducer, air entraining agent, accelerator, water.A kind of durable anti-crack concrete in tunnel proposed by the present invention, workability is good, while having many advantages, such as good splitting resistance and durability.
Description
Technical field
The present invention relates to the durable anti-crack concretes of technical field of concrete more particularly to a kind of tunnel.
Background technique
Concrete is the maximum construction material of current dosage, and high performance concrete represents the development side of concrete technology
To.In recent years, with the fast development of domestic construction industry, the performance requirements such as splitting resistance and durability to concrete it is also proposed that
Requirements at the higher level.Currently, the splitting resistance and durability of tunnel concrete are not able to satisfy the market demand, need further to grind
Study carefully and improves.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of durable anti-crack concrete in tunnel,
Workability is good, while having many advantages, such as good splitting resistance and durability.
A kind of durable anti-crack concrete in tunnel proposed by the present invention, raw material includes: portland cement by weight
320-420 parts, 30-45 parts of wollastonite powder, 40-55 parts of slag powders, 850-950 parts of sand, 25-35 parts of latex powder, the sub- 900- of microlith
1000 parts, 4-6 parts of polypropylene fibre, 2-3 parts of carbon fiber, 2-3 parts of polyacrylonitrile fibre, 1.5-3 parts of ceramic fibre, polycarboxylic-acid
4-5.5 parts of water-reducing agent, 0.06-0.12 parts of air entraining agent, 4-5 parts of accelerator, 140-160 parts of water.
In specific embodiment, the parts by weight of portland cement can also be part, and the parts by weight of wollastonite powder can also be
330,340,350,360,380,400,410 parts, the parts by weight of slag powders can also be 32,35,38,40,42,44 parts, sand
Parts by weight can also be 865,880,905,915,920,940 parts, and the parts by weight of latex powder can also be 27,29,31,33,34
Part, the parts by weight of microlith can also be 915,930,945,960,980 parts, the parts by weight of polypropylene fibre can also be 4.2,
4.5,4.8,5.2,5.5,5.8 parts, the parts by weight of carbon fiber can also be 2.2,2.4,2.6,2.8 parts, polyacrylonitrile fibre
Parts by weight can also be 2.2,2.4,2.6,2.8 parts, and the parts by weight of ceramic fibre can also be 1.8,2,2.2,2.4,2.6,2.8
Part, the parts by weight of poly carboxylic acid series water reducer can also be 4.2,4.5,4.8,5,5.2 parts, and the parts by weight of air entraining agent can also be
0.07,0.08,0.09,0.1,0.11 part, the parts by weight of accelerator can also be 4.1,4.2,4.5,4.6,4.8 parts, the weight of water
Measuring part can also be 142,145,148,152,155,158 parts.
Preferably, the length of polypropylene fibre is 12-14mm.
Preferably, the length of polyacrylonitrile fibre is 8-10mm.
Preferably, the fineness modulus of sand is 3.2-3.5, and moisture content 4.5-5%, clay content is no more than 2.0wt%.
Preferably, air entraining agent is made of by weight for 1-1.5:2-3 colophony powder, sodium alkyl benzene sulfonate.
Preferably, the granularity of latex powder is 80-100 mesh.
Preferably, poly carboxylic acid series water reducer is prepared by following technique: by methyl allyl polyoxyethylene ether and go from
Sub- water mixing, is warming up to 74-78 DEG C, hydroxy methyl methacrylate, methylpropene sodium sulfonate, acrylic acid is added dropwise under stirring
And ammonium persulfate, time for adding 3-3.5h are warming up to 82-86 DEG C after being added dropwise to complete, and continue to stir 25-30min, then be down to
Room temperature, regulation system pH to neutrality, obtains poly carboxylic acid series water reducer.
Preferably, methyl allyl polyoxyethylene ether, 4- hydroxybutyl acrylate, 2- acrylic acid amido -2- methyl-prop
Sulfonic acid, acrylic acid, the weight ratio between ammonium persulfate are 20-30:1.5-2.5:2.5-4:4-6:0.2-0.3.
Preferably, accelerator is prepared by following technique: sodium tripolyphosphate being mixed with deionized water, is stirred to complete
Then dissolution is added polyaluminium sulfate and sodium aluminate, heating stirring, adds disodium ethylene diamine tetraacetate, triethanolamine and sulphur
Sodium thiosulfate stirs, cooling, and regulation system pH value obtains accelerator.
Preferably, accelerator is prepared by following technique: by weight by 1-1.5 parts of sodium tripolyphosphates and deionized water
Mixing stirs to being completely dissolved, 40-50 parts of polyaluminium sulfates and 4-6 parts of sodium aluminates is then added, and is heated to 75-80 DEG C of stirring
To dissolution, 1-1.5 parts of disodium ethylene diamine tetraacetates, 8-10 parts of triethanolamines and 1-2 parts of sodium thiosulfate are added, in 75-80
DEG C stirring 1-1.5h, be cooled to room temperature, regulation system pH value to 3.5-4.5 obtains accelerator.
Poly carboxylic acid series water reducer of the present invention during the preparation process, using ammonium persulfate as initiator, using 4- hydroxybutyl third
Olefin(e) acid ester, 2- acrylic acid amido -2- methyl propane sulfonic acid replace a certain proportion of acrylic acid, control system temperature and time for adding,
Between 4- hydroxybutyl acrylate, 2- acrylic acid amido -2- methyl propane sulfonic acid, acrylic acid and methyl allyl polyoxyethylene ether
Occur polymerization and esterification, introduced in poly carboxylic acid series water reducer molecular structure active group for example hydroxyl, amido, ester group and
Sulfonic group, its special molecular structure of the poly carboxylic acid series water reducer of generation make it have it is good dispersibility, dispersion retentivity and
Slump retaining, and it is good with other each component compatibilities in concrete, can effectively destroy the flocculent structure of cement granules, is played point
The effect of bulk cement particle and hydrated cementitious particle, while it being effectively improved the workability of concrete mix, bleeding is prevented, is improved
Its density improves its uniformity, and the concrete after construction has preferable finish and flatness, extraneous hazardous medium
It is difficult to invade in inside concrete, impervious shock resistance is good, by improving concrete structure, can significantly improve concrete of the present invention
Splitting resistance and durability effectively prevent the generation of non-loaded deformation；In accelerator, by optimizing the obtained rapid hardening of preparation process
Agent is a kind of novel alkali-free chlorine-free liquid accelerator, and dispersibility and dispersion retentivity are good, then is cooperated with latex powder, is played good
Thickening power is viscosified, can significantly improve initial concrete hydrating rate of heat release, when wet shot can increase coagulation soil cohesion, reduce back
Bullet amount plays early strong and promotees solidifying effect to concrete, and the presetting period shortens 50-60%, final setting time shortening 20-30%, and
And concrete system stability can be improved；Poly carboxylic acid series water reducer and accelerator cooperate, and adaptability is good, are suitable for constructing tunnel,
By improving concrete institutional framework, agent on crack resistance of concrete cracking behavior and durability are effectively improved；Select colophony powder, sodium alkyl benzene sulfonate
Cooperation is used as air entraining agent, has synergistic effect, generates appropriate small and independent bubble, reduces friction resistance in concrete
Power further improves workability, mobility and the slump retaining of concrete, helps to improve concrete durability of the present invention and improvement
Its mechanical property；Polypropylene fibre, carbon fiber, polyacrylonitrile fibre and ceramic fibre cooperation, play good filling effect, shape
Scattering and disappearing for moisture is effectively prevented at complicated three-dimensional confusion system, reduces concrete shrinkage amount, also reduction concrete pore rate,
Harmful hole in concrete is reduced, so that the pore size distribution$ of concrete tends to rationally, compactness is improved, and effectively improves concrete
Toughness, crack resistance and shock resistance improve its durability.A kind of durable anti-crack concrete in tunnel proposed by the present invention, and
Easy property is good, while having many advantages, such as good splitting resistance and durability.
Specific embodiment
In the following, technical solution of the present invention is described in detail by specific embodiment.
Embodiment 1
A kind of durable anti-crack concrete in tunnel proposed by the present invention, raw material includes: portland cement by weight
320 parts, 30 parts of wollastonite powder, 55 parts of slag powders, 850 parts of sand, 25 parts of latex powder, microlith 900 parts, 4 parts of polypropylene fibre, carbon fiber
Tie up 3 parts, 2 parts of polyacrylonitrile fibre, 3 parts of ceramic fibre, 4 parts of poly carboxylic acid series water reducer, 0.06 part of air entraining agent, 4 parts of accelerator, water
125 parts.
Embodiment 2
A kind of durable anti-crack concrete in tunnel proposed by the present invention, raw material includes: portland cement by weight
420 parts, 45 parts of wollastonite powder, 40 parts of slag powders, 950 parts of sand, 35 parts of latex powder, microlith 1000 parts, 6 parts of polypropylene fibre, carbon
2 parts of fiber, 3 parts of polyacrylonitrile fibre, 1.5 parts of ceramic fibre, 5.5 parts of poly carboxylic acid series water reducer, 0.12 part of air entraining agent, accelerator
5 parts, 160 parts of water.
Wherein, the length of polypropylene fibre is 12mm；
The length of polyacrylonitrile fibre is 10mm；
The fineness modulus of sand is 3.2, and moisture content 4.5%, clay content is no more than 2.0wt%；
Air entraining agent is made of by weight for 1:2 colophony powder, sodium alkyl benzene sulfonate；
The granularity of latex powder is 80 mesh；
Poly carboxylic acid series water reducer is prepared by following technique: methyl allyl polyoxyethylene ether and deionized water are mixed
It closes, is warming up to 74 DEG C, hydroxy methyl methacrylate, methylpropene sodium sulfonate, acrylic acid and persulfuric acid are added dropwise under stirring
Ammonium, time for adding 3.5h are warming up to 82 DEG C after being added dropwise to complete, continue to stir 25min, be then down to room temperature, regulation system pH
To neutrality, poly carboxylic acid series water reducer is obtained；
Accelerator is prepared by following technique: sodium tripolyphosphate being mixed with deionized water, is stirred to being completely dissolved, so
Polyaluminium sulfate and sodium aluminate, heating stirring are added afterwards, adds disodium ethylene diamine tetraacetate, triethanolamine and thiosulfuric acid
Sodium stirs, cooling, and regulation system pH value obtains accelerator.
Embodiment 3
A kind of durable anti-crack concrete in tunnel proposed by the present invention, raw material includes: portland cement by weight
380 parts, 38 parts of wollastonite powder, 48 parts of slag powders, 900 parts of sand, 30 parts of latex powder, microlith 950 parts, 5 parts of polypropylene fibre, carbon fiber
Tie up 2.5 parts, 2.5 parts of polyacrylonitrile fibre, 2.2 parts of ceramic fibre, 4.8 parts of poly carboxylic acid series water reducer, 0.1 part of air entraining agent, rapid hardening
4.5 parts of agent, 145 parts of water.
Wherein, the length of polypropylene fibre is 13mm；
The length of polyacrylonitrile fibre is 9mm；
The fineness modulus of sand is 3.4, moisture content 4.8%, clay content 1.5wt%；
Air entraining agent is made of by weight for 1.2:2.5 colophony powder, sodium alkyl benzene sulfonate；
The granularity of latex powder is 90 mesh；
Poly carboxylic acid series water reducer is prepared by following technique: methyl allyl polyoxyethylene ether and deionized water are mixed
It closes, is warming up to 76 DEG C, hydroxy methyl methacrylate, methylpropene sodium sulfonate, acrylic acid and persulfuric acid are added dropwise under stirring
Ammonium, time for adding 3.2h are warming up to 85 DEG C after being added dropwise to complete, continue to stir 28min, be then down to room temperature, regulation system pH
To neutrality, poly carboxylic acid series water reducer is obtained；Wherein, methyl allyl polyoxyethylene ether, 4- hydroxybutyl acrylate, 2- propylene
Acid amide base -2- methyl propane sulfonic acid, acrylic acid, the weight ratio between ammonium persulfate are 25:2:3.5:5:0.25；
Accelerator is prepared by following technique: by weight being mixed 1.2 parts of sodium tripolyphosphates with deionized water, is stirred
To being completely dissolved, 45 parts of polyaluminium sulfates and 5 parts of sodium aluminates are then added, is heated to 78 DEG C of stirrings to dissolving, adds 1.2 parts
Disodium ethylene diamine tetraacetate, 9 parts of triethanolamines and 1.5 parts of sodium thiosulfate are cooled to room temperature in 78 DEG C of stirring 1.2h, are adjusted
System pH obtains accelerator to 4.
Embodiment 4
A kind of durable anti-crack concrete in tunnel proposed by the present invention, raw material includes: portland cement by weight
350 parts, 35 parts of wollastonite powder, 50 parts of slag powders, 880 parts of sand, 28 parts of latex powder, microlith 920 parts, 4.6 parts of polypropylene fibre, carbon
2.2 parts of fiber, 2.8 parts of polyacrylonitrile fibre, 2.5 parts of ceramic fibre, 5.2 parts of poly carboxylic acid series water reducer, 0.08 part of air entraining agent, speed
Solidifying 4.2 parts of agent, 135 parts of water.
Wherein, the length of polypropylene fibre is 14mm；
The length of polyacrylonitrile fibre is 8mm；
The fineness modulus of sand is 3.5, moisture content 5%, clay content 1.2wt%；
Air entraining agent is made of by weight for 1:3 colophony powder, sodium alkyl benzene sulfonate；
The granularity of latex powder is 100 mesh；
Poly carboxylic acid series water reducer is prepared by following technique: methyl allyl polyoxyethylene ether and deionized water are mixed
It closes, is warming up to 78 DEG C, hydroxy methyl methacrylate, methylpropene sodium sulfonate, acrylic acid and persulfuric acid are added dropwise under stirring
Ammonium, time for adding 3h are warming up to 86 DEG C after being added dropwise to complete, continue to stir 30min, be then down to room temperature, regulation system pH is extremely
Neutrality obtains poly carboxylic acid series water reducer；Wherein, methyl allyl polyoxyethylene ether, 4- hydroxybutyl acrylate, 2- acrylic acid
Amido -2- methyl propane sulfonic acid, acrylic acid, the weight ratio between ammonium persulfate are 20:1.5:2.5:4:0.2；
Accelerator is prepared by following technique: by weight being mixed 1 part of sodium tripolyphosphate with deionized water, stirring is extremely
It is completely dissolved, 40 parts of polyaluminium sulfates and 4 parts of sodium aluminates is then added, be heated to 75 DEG C of stirrings to dissolving, add 1 part of second two
Amine tetraacethyl disodium, 8 parts of triethanolamines and 1 part of sodium thiosulfate are cooled to room temperature, regulation system pH in 75 DEG C of stirring 1.5h
Value obtains accelerator to 3.5.
Embodiment 5
A kind of durable anti-crack concrete in tunnel proposed by the present invention, raw material includes: portland cement by weight
400 parts, 40 parts of wollastonite powder, 45 parts of slag powders, 920 parts of sand, 32 parts of latex powder, microlith 980 parts, 5.5 parts of polypropylene fibre, carbon
2.8 parts of fiber, 2.2 parts of polyacrylonitrile fibre, 1.8 parts of ceramic fibre, 4.5 parts of poly carboxylic acid series water reducer, 0.11 part of air entraining agent, speed
Solidifying 4.8 parts of agent, 155 parts of water.
Wherein, the length of polypropylene fibre is 12.5mm；
The length of polyacrylonitrile fibre is 8.5mm；
The fineness modulus of sand is 3.3, and moisture content 4.6%, clay content is no more than 1.0wt%；
Air entraining agent is made of by weight for 1.5:2 colophony powder, sodium alkyl benzene sulfonate；
The granularity of latex powder is 100 mesh；
Poly carboxylic acid series water reducer is prepared by following technique: methyl allyl polyoxyethylene ether and deionized water are mixed
It closes, is warming up to 75 DEG C, hydroxy methyl methacrylate, methylpropene sodium sulfonate, acrylic acid and persulfuric acid are added dropwise under stirring
Ammonium, time for adding 3.4h are warming up to 84 DEG C after being added dropwise to complete, continue to stir 26min, be then down to room temperature, regulation system pH
To neutrality, poly carboxylic acid series water reducer is obtained；Wherein, methyl allyl polyoxyethylene ether, 4- hydroxybutyl acrylate, 2- propylene
Acid amide base -2- methyl propane sulfonic acid, acrylic acid, ammonium persulfate, the weight ratio between preservative are 30:2.5:4:6:0.3；
Accelerator is prepared by following technique: by weight being mixed 1.5 parts of sodium tripolyphosphates with deionized water, is stirred
To being completely dissolved, 50 parts of polyaluminium sulfates and 6 parts of sodium aluminates are then added, is heated to 80 DEG C of stirrings to dissolving, adds 1.5 parts
Disodium ethylene diamine tetraacetate, 10 parts of triethanolamines and 2 parts of sodium thiosulfate are cooled to room temperature, regulation system in 80 DEG C of stirring 1h
PH value obtains accelerator to 4.5.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of durable anti-crack concrete in tunnel, which is characterized in that its raw material includes: portland cement 250- by weight
300 parts, 25-50 parts of wollastonite powder, 20-30 parts of slag powders, 800-1000 parts of sand, 20-25 parts of latex powder, the sub- 800-1000 of microlith
Part, is gathered 3-4.5 parts of polypropylene fibre, 1.5-2.5 parts of carbon fiber, 0.5-1 parts of polyacrylonitrile fibre, 0.8-1.2 parts of ceramic fibre
5-6.5 parts of carboxylic acid water reducing agent, 0.1-0.15 parts of air entraining agent, 3.5-5 parts of accelerator, 105-125 parts of water.
2. the durable anti-crack concrete in tunnel according to claim 1, which is characterized in that the length of polypropylene fibre is
12-14mm。
3. the durable anti-crack concrete in tunnel according to claim 1 or claim 2, which is characterized in that the length of polyacrylonitrile fibre
Degree is 8-10mm.
4. the durable anti-crack concrete in tunnel described in any one of -3 according to claim 1, which is characterized in that the fineness mould of sand
Number is 3.2-3.5, and moisture content 4.5-5%, clay content is no more than 2.0wt%.
5. the durable anti-crack concrete in tunnel described in any one of -4 according to claim 1, which is characterized in that air entraining agent is by pine
Face powder, sodium alkyl benzene sulfonate are 1-1.5:2-3 composition by weight.
6. the durable anti-crack concrete in tunnel described in any one of -5 according to claim 1, which is characterized in that the grain of latex powder
Degree is 80-100 mesh.
7. the durable anti-crack concrete in tunnel described in any one of -6 according to claim 1, which is characterized in that polycarboxylic-acid subtracts
Aqua is prepared by following technique: methyl allyl polyoxyethylene ether mixed with deionized water, is warming up to 74-78 DEG C,
Hydroxy methyl methacrylate, methylpropene sodium sulfonate, acrylic acid and ammonium persulfate, time for adding 3- are added dropwise under stirring
3.5h is warming up to 82-86 DEG C after being added dropwise to complete, and continues to stir 25-30min, is then down to room temperature, regulation system pH to neutrality,
Obtain poly carboxylic acid series water reducer.
8. the durable anti-crack concrete in tunnel described in any one of -7 according to claim 1, which is characterized in that methacrylic
Polyoxyethylene ether, 4- hydroxybutyl acrylate, 2- acrylic acid amido -2- methyl propane sulfonic acid, acrylic acid, between ammonium persulfate
Weight ratio is 20-30:1.5-2.5:2.5-4:4-6:0.2-0.3.
9. the durable anti-crack concrete in tunnel described in any one of -8 according to claim 1, which is characterized in that accelerator press with
It is prepared by lower technique: sodium tripolyphosphate is mixed with deionized water, stir to being completely dissolved, then be added polyaluminium sulfate and
Sodium aluminate, heating stirring add disodium ethylene diamine tetraacetate, triethanolamine and sodium thiosulfate, stir, cooling, adjust body
It is pH value, obtains accelerator.
10. the durable anti-crack concrete in tunnel described in any one of -9 according to claim 1, which is characterized in that accelerator is pressed
Prepared by following technique: by weight mixing 1-1.5 parts of sodium tripolyphosphates with deionized water, stir to being completely dissolved, so
40-50 parts of polyaluminium sulfates and 4-6 parts of sodium aluminates are added afterwards, is heated to 75-80 DEG C of stirring to dissolving, adds 1-1.5 parts of second
Edetate disodium, 8-10 part triethanolamine and 1-2 parts of sodium thiosulfate are cooled to room in 75-80 DEG C of stirring 1-1.5h
Temperature, regulation system pH value to 3.5-4.5, obtains accelerator.
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| CN112679167A (en) * | 2021-01-29 | 2021-04-20 | 烟台泰航混凝土有限公司 | Anti-cracking concrete and preparation method thereof |
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| CN110256009A (en) * | 2019-06-19 | 2019-09-20 | 中铁二十三局集团轨道交通工程有限公司 | A kind of basalt fibre+latex powder anti-crack concrete |
| CN112679167A (en) * | 2021-01-29 | 2021-04-20 | 烟台泰航混凝土有限公司 | Anti-cracking concrete and preparation method thereof |
| CN114262192A (en) * | 2021-12-31 | 2022-04-01 | 杭州华杰商品混凝土有限公司 | High-workability concrete for tunnel and preparation method thereof |
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