CN111393113A - Concrete for prefabricated tunnel lining segment and preparation method thereof - Google Patents
Concrete for prefabricated tunnel lining segment and preparation method thereof Download PDFInfo
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- CN111393113A CN111393113A CN202010276422.7A CN202010276422A CN111393113A CN 111393113 A CN111393113 A CN 111393113A CN 202010276422 A CN202010276422 A CN 202010276422A CN 111393113 A CN111393113 A CN 111393113A
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- 239000004567 concrete Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 50
- 239000010881 fly ash Substances 0.000 claims abstract description 33
- 239000004575 stone Substances 0.000 claims abstract description 32
- 239000002253 acid Substances 0.000 claims abstract description 31
- 239000011398 Portland cement Substances 0.000 claims abstract description 30
- 239000000701 coagulant Substances 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000002518 antifoaming agent Substances 0.000 claims description 9
- 239000012452 mother liquor Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 abstract description 6
- 239000006260 foam Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000003763 carbonization Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses concrete for a prefabricated tunnel lining segment and a preparation method thereof, wherein the concrete comprises 350 parts of Portland cement 310-containing materials, 80-100 parts of high-quality fly ash, 300 parts of 5-10mm broken stone 240-containing materials, 980 parts of 10-25mm broken stone 900-containing materials, 670 parts of medium sand 630-containing materials, 3.0-4.0 parts of polycarboxylic acid high-performance water reducing agent, 1.5-2.5 parts of coagulant and 140 parts of water 130-containing materials, wherein 2/3 parts of water, cement, fly ash and sand are stirred for 15 seconds, then the broken stone, 1/3 parts of water, the polycarboxylic acid high-performance water reducing agent and the coagulant are stirred for 90 seconds after being put into the materials, and then the water reducing agent is added and stirred for 60-80 seconds.
Description
Technical Field
The invention relates to the technical field of preparation of concrete for prefabricated tunnel lining segments, in particular to concrete for prefabricated tunnel lining segments and a preparation method thereof.
Background
Segment lining, tunnel lining assembled by prefabricated components in factories or construction sites, and the adoption of fabricated lining is one of the development directions of underground engineering.
And (5) carbonizing the concrete. Ca (OH)2 in the cement aggregate, O2 in the air and CO2 in underground water are subjected to hydration reaction to generate CaCO3, and CO2 in automobile exhaust causes carbonization, so that the Ca (OH)2 is reduced by concrete carbonization, and the alkali content (alkalinity) and pH value of the concrete are reduced, thereby causing the concrete to be corroded by carbonization; meanwhile, after CO2 permeates into the concrete protective layer, the passive film on the surface of the steel bar is corroded and rusted. In addition, carbonization causes concrete shrinkage, tensile stress is generated on the surface of the concrete, shrinkage micro-cracks appear, the impermeability of the concrete is reduced, and the steel bars are rusted and swollen, so that the concrete protective layer is further peeled off.
The segment lining is formed by pouring concrete materials for construction, wherein the concrete is called concrete for short: refers to the general name of engineering composite materials formed by cementing aggregate into a whole by cementing materials. The term concrete generally refers to cement as the cementing material and sand and stone as the aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering.
Concrete is one of the most important civil engineering materials of the present generation. The artificial stone is prepared by a cementing material, granular aggregate (also called aggregate), water, an additive and an admixture which are added if necessary according to a certain proportion, and is formed by uniformly stirring, compacting, forming, curing and hardening.
The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material.
The most important properties of concrete mixtures. It comprehensively expresses the consistency, the fluidity, the plasticity, the anti-demixing and segregation bleeding performance, the easy-to-smear property and the like of the mixture. Methods and indexes for measuring and expressing the workability of the mixture are many, and China mainly adopts slump (millimeter) measured by a truncated cone slump cone and the Weibo time (second) measured by a Weibo instrument as main indexes of the consistency.
The most important mechanical properties of the hardened concrete refer to the ability of the concrete to resist stresses such as compression, tension, bending and shearing. The water cement ratio, the variety and the dosage of cement, the variety and the dosage of aggregate, stirring, forming and curing all directly influence the strength of concrete. The concrete is divided into 19 grades according to standard compressive strength (the cubic compressive strength which is measured by a standard test method and has 95% guarantee rate by taking a cube with the side length of 150mm as a standard test piece and curing for 28 days under standard curing conditions) called as a mark, wherein the grades are divided into C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80, C85, C90, C95 and C100. The tensile strength of the concrete is only 1/10-1/20 of the compressive strength of the concrete. The improvement of the ratio of tensile strength to compressive strength of concrete is an important aspect of concrete modification.
The use environment of the segment lining is different, and the special use environment requirement can be met only by adopting the formula configuration different from the common concrete.
Disclosure of Invention
The invention aims to provide concrete for a prefabricated tunnel lining segment, which has the advantages of high solidification speed of concrete, less foam in the concrete and high strength of a solidified concrete wall body, and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a concrete for a prefabricated tunnel lining segment and a preparation method thereof comprise 350 parts of Portland cement, 80-100 parts of high-quality fly ash, 300 parts of 5-10mm gravel, 900 parts of 10-25mm gravel, 670 parts of medium sand, 3.0-4.0 parts of a polycarboxylic acid high-performance water reducing agent, 1.5-2.5 parts of a coagulant and 140 parts of water 130.
Preferably, 320 parts of portland cement, 90 parts of high-quality fly ash, 280 parts of crushed stone with the thickness of 5-10mm, 950 parts of crushed stone with the thickness of 15mm, 660 parts of medium, 3.6 parts of polycarboxylic acid high-performance water reducing agent, 2.0 parts of coagulant and 133 parts of water.
Preferably, the portland cement is grade 52.5.
Preferably, the high-quality fly ash is II-grade fly ash.
Preferably, the polycarboxylic acid high-performance water reducing agent comprises
80 to 85 percent of water
14 to 17 percent of water reducing agent mother liquor
0.5 to 0.9 percent of air entraining agent
0.7 to 1.1 percent of defoaming agent
0.7 to 1.3 percent of viscosity reducer
0.7 to 1.2 percent of water-retaining agent.
Preferably, the preparation method of the concrete for the prefabricated tunnel lining segment comprises the following steps:
A. preparing materials: portland cement, high-quality fly ash, crushed stone of 5-10mm, medium sand of 10-25mm, a polycarboxylic acid high-performance water reducing agent, a coagulant and water;
B. firstly, 2/3 water, Portland cement, high-quality fly ash and medium sand are mixed together and stirred for 15 seconds;
C. then, two kinds of crushed stones with different diameters are added in sequence, and 1/3 water, polycarboxylic acid high-performance water reducing agent and coagulant are added to continue stirring for 90 seconds.
Compared with the prior art, the invention has the beneficial effects that:
the concrete for the prefabricated tunnel lining segment has high solidification speed, less foam in the concrete and high strength of the solidified concrete wall body.
Drawings
FIG. 1 is a flow chart of the preparation of concrete for a prefabricated tunnel lining segment according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a concrete for a prefabricated tunnel lining segment and a preparation method thereof comprise 350 parts of Portland cement, 80-100 parts of high-quality fly ash, 300 parts of 5-10mm gravel, 900 parts of 10-25mm gravel, 670 parts of medium sand, 3.0-4.0 parts of a polycarboxylic acid high-performance water reducing agent, 1.5-2.5 parts of a coagulant and 140 parts of water 130.
320 parts of portland cement, 90 parts of high-quality fly ash, 280 parts of crushed stone of 5-10mm, 950 parts of crushed stone of 15mm, 660 parts of medium, 3.6 parts of polycarboxylic acid high-performance water reducing agent, 2.0 parts of coagulant and 133 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent. In the case of the example 1, the following examples are given,
315 parts of Portland cement, 84 parts of high-quality fly ash, 253 parts of 5-10mm broken stone, 920 parts of 15mm broken stone, 640 parts of medium, 3.3 parts of polycarboxylic acid high-performance water reducing agent, 1.7 parts of coagulant and 138 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent.
In the case of the example 2, the following examples are given,
319 parts of portland cement, 88 parts of high-quality fly ash, 264 parts of 5-10mm broken stone, 940 parts of 15mm broken stone, 650 parts of medium, 3.5 parts of polycarboxylic acid high-performance water reducing agent, 1.8 parts of coagulant and 139 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent. In the case of the example 3, the following examples are given,
330 parts of portland cement, 93 parts of high-quality fly ash, 275 parts of crushed stone of 5-10mm, 960 parts of crushed stone of 15mm, 655 parts of medium sand, 3.7 parts of polycarboxylic acid high-performance water reducing agent, 2.0 parts of coagulant and 140 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent.
In the case of the example 4, the following examples are given,
335 parts of portland cement, 96 parts of high-quality fly ash, 280 parts of 5-10mm broken stone, 965 parts of 15mm broken stone, 660 parts of medium sand, 3.8 parts of polycarboxylic acid high-performance water reducing agent, 2.2 parts of coagulant and 140 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent.
In the case of the example 5, the following examples were conducted,
340 parts of portland cement, 98 parts of high-quality fly ash, 285 parts of crushed stone of 5-10mm, 970 parts of crushed stone of 15mm, 665 parts of medium sand, 3.9 parts of polycarboxylic acid high-performance water reducing agent, 2.4 parts of coagulant and 138 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent.
In the case of the example 6, it is shown,
345 parts of portland cement, 99 parts of high-quality fly ash, 295 parts of crushed stone with the thickness of 5-10mm, 976 parts of crushed stone with the thickness of 15mm, 667 parts of medium sand, 4.0 parts of polycarboxylic acid high-performance water reducing agent, 2.5 parts of coagulant and 138 parts of water.
Wherein the grade of the portland cement is 52.5 grade, the grade of the high-quality fly ash is II grade, and the polycarboxylic acid high-performance water reducing agent adopted in the concrete comprises 80-85% of water, 14-17% of mother liquor of the water reducing agent, 0.5-0.9% of air entraining agent, 0.7-1.1% of defoaming agent, 0.7-1.3% of viscosity reducing agent and 0.7-1.2% of water-retaining agent.
The configuration method comprises the following steps: the preparation process of the concrete for the prefabricated tunnel lining segment comprises the following steps: firstly, 2/3 water, portland cement, high-quality fly ash and medium sand are mixed together and stirred for 15 seconds, then two types of gravels with different diameters are sequentially added, 1/3 water, a polycarboxylic acid high-performance water reducing agent and a coagulant are added, and stirring is continued for 90 seconds, so that the concrete preparation is completed.
To sum up, when the formula of the mixed clean soil comprises 320 parts of portland cement, 90 parts of high-quality fly ash, 280 parts of crushed stone with the thickness of 5-10mm, 950 parts of crushed stone with the thickness of 15mm, 660 parts of medium, 3.6 parts of polycarboxylic acid high-performance water reducing agent, 2.0 parts of coagulant and 133 parts of water, the prepared concrete for the prefabricated tunnel lining segment has the fastest solidification speed, the concrete contains the least foam, the solidified concrete wall has the highest strength, and the seaport member has the best comprehensive performance.
The concrete for the prefabricated tunnel lining segment has high solidification speed, less foam in the concrete and high strength of the solidified concrete wall body.
A preparation method of concrete for prefabricating tunnel lining segments comprises the following steps:
A. preparing materials: portland cement, high-quality fly ash, crushed stone of 5-10mm, medium sand of 10-25mm, a polycarboxylic acid high-performance water reducing agent, a coagulant and water;
B. firstly, 2/3 water, Portland cement, high-quality fly ash and medium sand are mixed together and stirred for 15 seconds;
C. then, two kinds of crushed stones with different diameters are added in sequence, and 1/3 water, polycarboxylic acid high-performance water reducing agent and coagulant are added to continue stirring for 90 seconds.
In conclusion, the concrete for the prefabricated tunnel lining segment has high solidification speed, less foam in the concrete and high strength of the solidified concrete wall body.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A concrete for prefabricating tunnel lining segments and a preparation method thereof are characterized in that: comprises 350 portions of Portland cement 310-100 portions, 300 portions of high-quality fly ash 240-containing crushed stone 5-10mm, 980 portions of crushed stone 900-25 mm, 670 portions of medium sand 630-containing sand, 3.0-4.0 portions of polycarboxylic acid high-performance water reducing agent, 1.5-2.5 portions of coagulant and 140 portions of water 130-containing sand.
2. A concrete for prefabricating tunnel lining segments and a preparation method thereof are characterized in that: 320 parts of portland cement, 90 parts of high-quality fly ash, 280 parts of 5-10mm broken stone, 950 parts of 15mm broken stone, 660 parts of medium, 3.6 parts of polycarboxylic acid high-performance water reducing agent, 2.0 parts of coagulant and 133 parts of water.
3. The concrete for prefabricating the tunnel lining segments and the preparation method thereof as claimed in claim 1, wherein: the portland cement was grade 52.5.
4. The concrete for prefabricating the tunnel lining segments and the preparation method thereof as claimed in claim 1, wherein: the high-quality fly ash is II-grade fly ash.
5. The concrete for prefabricating the tunnel lining segments and the preparation method thereof as claimed in claim 1, wherein: the polycarboxylic acid high-performance water reducing agent comprises
80 to 85 percent of water
14 to 17 percent of water reducing agent mother liquor
0.5 to 0.9 percent of air entraining agent
0.7 to 1.1 percent of defoaming agent
0.7 to 1.3 percent of viscosity reducer
0.7 to 1.2 percent of water-retaining agent.
6. The concrete for realizing the prefabricated tunnel lining segment of claim 1, wherein the preparation method comprises the following steps:
A. preparing materials: portland cement, high-quality fly ash, crushed stone of 5-10mm, medium sand of 10-25mm, a polycarboxylic acid high-performance water reducing agent, a coagulant and water;
B. firstly, 2/3 water, Portland cement, high-quality fly ash and medium sand are mixed together and stirred for 15 seconds;
C. then, two kinds of crushed stones with different diameters are added in sequence, and 1/3 water, polycarboxylic acid high-performance water reducing agent and coagulant are added to continue stirring for 90 seconds.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720140A (en) * | 2020-07-31 | 2020-09-29 | 中铁科学研究院有限公司 | Synthetic fiber reinforced concrete shield segment and preparation method thereof |
| CN112299760A (en) * | 2020-09-28 | 2021-02-02 | 永安市永福混凝土工程有限公司 | Wet-mixed concrete special for assembled wall and preparation method thereof |
| CN113880530A (en) * | 2021-11-17 | 2022-01-04 | 贵州大学 | Preparation method of self-compacting fair-faced concrete in tunnel secondary lining |
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