CN110845190A - Ultrahigh-performance cement-based material applied to wet-process injection construction - Google Patents
Ultrahigh-performance cement-based material applied to wet-process injection construction Download PDFInfo
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- CN110845190A CN110845190A CN201910838806.0A CN201910838806A CN110845190A CN 110845190 A CN110845190 A CN 110845190A CN 201910838806 A CN201910838806 A CN 201910838806A CN 110845190 A CN110845190 A CN 110845190A
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an ultrahigh-performance cement-based material applied to wet-process injection construction, which comprises the following ingredients in parts by weight: 400 parts of cement, 50-100 parts of fly ash floating beads, 50-100 parts of silica fume, 40-70 parts of superfine limestone powder, 5-15 parts of surfactant, 30-50 parts of magnesium expanding agent, 400 parts of quartz sand, 100 parts of coral reef sand, 200 parts of microfilament steel fiber, 3-6 parts of ultrahigh molecular weight polyethylene fiber, 1-5 parts of mineral additive, 90-120 parts of mixing water and 25-45 parts of accelerating agent; wherein the surfactant is naphthalene series or aliphatic organic powder; the mineral additive is attapulgite gel powder, and the average particle size is 5-15 mu m; the accelerator is an alkali-free accelerator with the total alkali content not more than 1 percent, and the main components are aluminum sulfate and organic amine. Can be widely applied to the field of cement-based material preparation.
Description
Technical Field
The invention relates to the field of cement-based material preparation. More particularly, the present invention relates to an ultra-high performance cement-based material for wet blasting applications.
Background
In recent years, on one hand, the construction projects of large-scale infrastructures in China are increasing day by day, and high requirements are put forward on the durability of concrete; on the other hand, as a large number of buildings in China enter the aging period, the large number of buildings need to be reformed, repaired and reinforced, and the sprayed concrete is increasingly regarded as a reinforcing and repairing material. However, the existing sprayed concrete has the problems of low later strength, relatively poor toughness, large later drying shrinkage, easiness in cracking, insufficient durability and environmental adaptability and the like. The ultra-high performance concrete is a novel cement-based engineering material with ultra-high impermeability and mechanical property, and can greatly solve the problems of the existing sprayed concrete if being applied to spraying construction, and the ultra-high performance concrete is pushed to a wider application space.
Disclosure of Invention
The invention aims to provide an ultrahigh-performance cement-based material applied to wet spraying construction, which can realize continuous wet spraying construction of ultrahigh-performance concrete and greatly improve the mechanical property and durability of the sprayed concrete.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an ultra-high performance cement-based material for wet injection construction, comprising the following ingredients in parts by weight: 400 parts of cement, 50-100 parts of fly ash floating beads, 50-100 parts of silica fume, 40-70 parts of superfine limestone powder, 5-15 parts of surfactant, 30-50 parts of magnesium expanding agent, 400 parts of quartz sand, 100 parts of coral reef sand, 200 parts of microfilament steel fiber, 3-6 parts of ultrahigh molecular weight polyethylene fiber, 1-5 parts of mineral additive, 90-120 parts of mixing water and 25-45 parts of accelerating agent;
wherein the surfactant is naphthalene series or aliphatic organic powder;
the mineral additive is attapulgite gel powder, and the average particle size is 5-15 mu m.
The accelerator is an alkali-free accelerator with the total alkali content not more than 1%, and the main components of the accelerator are aluminum sulfate and organic amine.
Preferably, the cement is a high belite portland cement having a strength not less than 42.5 grade.
Preferably, CaCO of the ultrafine limestone powder3The content is more than 95 percent, and the average grain diameter is not more than 80 nm.
Preferably, the magnesium expanding agent has an MgO content of more than 80%, an average particle diameter of 45-150 μm, and a 7d restricted expansion ratio of more than 0.015%.
Preferably, the preparation method of the ultra-high performance cement-based material applied to wet spraying construction comprises the steps of pre-soaking coral reef sand and 8% of water by mass of the coral reef sand, and obtaining a component A after the coral reef sand is fully wetted; fully mixing high belite portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent and quartz sand to obtain a component B; and (3) placing the component A and the component B in a stirrer, stirring for 1-2 minutes, adding stirring water, stirring for 3-5 minutes, adding the microfilament steel fiber, and continuously stirring for 2-4 minutes to obtain the ultrahigh-performance concrete.
Preferably, the preparation method of the ultra-high performance cement-based material applied to the wet spraying construction comprises the steps of pre-wetting coral reef sand and 8% of seawater by mass of the coral reef sand to obtain a component A; fully mixing high belite portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent, a mineral additive and quartz sand to obtain a component B; placing the component B in a stirrer, stirring for 1-2 minutes, adding mixing water, stirring for 3-5 minutes, adding microfilament steel fibers, and continuously stirring for 2-4 minutes to obtain a component C; and finally, adding the component A into the component C, and stirring for 1-2 minutes by using a stirrer to obtain the ultrahigh-performance cement-based material.
Preferably, the ultra-high performance concrete is used in wet-shotcrete construction.
The invention at least comprises the following beneficial effects:
1. the continuous wet spraying construction of the ultra-high performance concrete is realized, and the attapulgite gel powder is added into the concrete mixture, so that disordered grids can be formed in the slurry, the aggregate rolling is restrained, the static yield stress of the freshly mixed concrete is increased, and the rebound rate in the spraying process is reduced; and in dynamic state, the grid structure of the attapulgite in the slurry is damaged, the constraint is relieved, the flowability of the fresh concrete is increased, the workability is improved, and the spraying of the ultra-high performance concrete is facilitated.
2. The mechanical property and the durability of the sprayed concrete are greatly improved, and the early hydration of cement is promoted and the early strength of the sprayed concrete is improved by adding the ultrafine limestone powder into the concrete mixture. In addition, the ultrafine limestone powder can reduce dust and rebound rate. In addition, the incorporation of the ultrafine limestone powder can also reduce the self-shrinkage of the cement-based material.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The invention relates to an ultrahigh-performance cement-based material applied to wet injection construction, which comprises the following ingredients in parts by weight: 400 parts of cement, 50-100 parts of fly ash floating beads, 50-100 parts of silica fume, 40-70 parts of superfine limestone powder, 5-15 parts of surfactant, 30-50 parts of magnesium expanding agent, 400 parts of quartz sand, 100 parts of coral reef sand, 200 parts of microfilament steel fiber, 3-6 parts of ultrahigh molecular weight polyethylene fiber, 1-5 parts of mineral additive, 90-120 parts of mixing water and 25-45 parts of accelerating agent;
wherein the surfactant is naphthalene series or aliphatic organic powder;
the mineral additive is attapulgite gel powder, and the average particle size is 5-15 mu m;
the accelerator is an alkali-free accelerator with the total alkali content not more than 1%, and the main components of the accelerator are aluminum sulfate and organic amine.
In the technical scheme, the attapulgite gel powder is used as the mineral additive because the attapulgite gel powder is in a microfiber shape, and can form disordered grids in slurry, so that the aggregate rolling is restrained, the static yield stress of fresh concrete is increased, and the rebound rate in the spraying process is reduced; and in dynamic state, the grid structure of the attapulgite in the slurry is damaged, the constraint is relieved, the flowability of the fresh concrete is increased, the workability is improved, and the spraying of the ultra-high performance concrete is facilitated.
Naphthalene-based or aliphatic organic powder surfactants are used because they have high water reducing rate, fast strength increase and low air entraining amount, and do not greatly increase the viscosity of concrete compared to polycarboxylic acid-based surfactants.
Wherein the average particle diameter of the fly ash floating bead is 1-5 mu m, and the specific surface area is more than 2500m2/kg；
SiO of the silica fume2The content is more than 90 percent, and the specific surface area is more than 20000m2/kg；
The quartz sand is the quartz sand with the particle size of 0.45 mm-0.90 mm;
the coral reef sand is natural undisturbed coral reef sand with the particle size of 0.45-0.90 mm and the water absorption rate of more than or equal to 8%;
the length-diameter ratio of the ultra-high molecular weight polyethylene fiber is 400-500, and the diameter is 20-30 mu m;
in another technical scheme, the cement is high belite Portland cement with the strength not lower than 42.5 grade;
in the above technical solution, the purpose of using high belite portland cement is to: reduce the heat of hydration, and reduce self-shrinkage, thereby preventing temperature cracks and shrinkage cracks.
In another technical scheme, CaCO of the superfine limestone powder3The content is more than 95 percent, and the average grain diameter is not more than 80 nm;
in the technical scheme, the superfine limestone powder is used for promoting the early hydration of cement and improving the early strength of the sprayed concrete. In addition, the ultrafine limestone powder can reduce dust and rebound rate. In addition, the incorporation of the ultrafine limestone powder can also reduce the self-shrinkage of the cement-based material.
In another technical scheme, the MgO content of the magnesium expanding agent is more than 80%, the average grain diameter is 45-150 μm, and the 7d restricted expansion rate is more than 0.015%;
in another technical scheme, the preparation method of the ultra-high performance cement-based material applied to wet spraying construction comprises the steps of pre-soaking coral reef sand and 8% water by mass of the coral reef sand, and obtaining a component A after the coral reef sand is fully wetted; fully mixing high belite portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent and quartz sand to obtain a component B; and (3) placing the component A and the component B in a stirrer, stirring for 1-2 minutes, adding stirring water, stirring for 3-5 minutes, adding the microfilament steel fiber, and continuously stirring for 2-4 minutes to obtain the ultrahigh-performance concrete.
In another technical scheme, the preparation method of the ultra-high performance cement-based material applied to wet spraying construction comprises the steps of carrying out pre-wetting treatment on coral reef sand and 8% of seawater by mass to obtain a component A; fully mixing high belite portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent, a mineral additive and quartz sand to obtain a component B; placing the component B in a stirrer, stirring for 1-2 minutes, adding mixing water, stirring for 3-5 minutes, adding microfilament steel fibers, and continuously stirring for 2-4 minutes to obtain a component C; and finally, adding the component A into the component C, and stirring for 1-2 minutes by using a stirrer to obtain the ultrahigh-performance cement-based material.
In the technical scheme, the coral reef sand with the particle size of 0.45-0.90 mm is used and pre-wetted for the following purposes: by limiting the particle size range of the coral reef sand, the final granular material grading can meet the requirement of a tightest particle accumulation model, and the mechanical property and the durability of the ultra-high performance concrete are improved; compared with quartz sand, the coral reef sand has the characteristic of porous water absorption, can play an internal curing role after being doped into concrete after being subjected to pre-wetting treatment, and can relieve or even eliminate the self-shrinkage of the ultra-high performance concrete.
In another technical scheme, the ultra-high performance concrete is applied to wet spraying construction.
The first embodiment is as follows:
TABLE 1 spray ultra high Performance Cement-based materials mix ratio (kg)
Pre-wetting coral reef sand and seawater accounting for 8% of the mass of the coral reef sand to obtain a component A; fully mixing portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent, a mineral additive and quartz sand to obtain a component B; and (3) placing the component A and the component B in a stirrer, stirring for 1-2 minutes, adding stirring water, stirring for 3-5 minutes, adding fibers, and continuously stirring for 2-4 minutes to obtain the ultrahigh-performance cement-based material. The obtained ultra-high performance cement-based material is subjected to wet spraying construction, and an accelerator is added to a nozzle of a wet spraying machine for mixing, so that the sprayed ultra-high performance concrete is obtained, and the performance is as follows:
TABLE 2 spray ultra high Performance Cement-based Material Properties
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (7)
1. The ultra-high performance cement-based material applied to wet spraying construction is characterized by comprising the following ingredients in parts by weight: 400 parts of cement, 50-100 parts of fly ash floating beads, 50-100 parts of silica fume, 40-70 parts of superfine limestone powder, 5-15 parts of surfactant, 30-50 parts of magnesium expanding agent, 400 parts of quartz sand, 100 parts of coral reef sand, 200 parts of microfilament steel fiber, 3-6 parts of ultrahigh molecular weight polyethylene fiber, 1-5 parts of mineral additive, 90-120 parts of mixing water and 25-45 parts of accelerating agent;
wherein the surfactant is naphthalene series or aliphatic organic powder;
the mineral additive is attapulgite gel powder, and the average particle size is 5-15 mu m;
the accelerator is an alkali-free accelerator with the total alkali content not more than 1%, and the main components of the accelerator are aluminum sulfate and organic amine.
2. The ultra-high performance cement-based material for wet blasting construction as claimed in claim 1,
the cement is high belite Portland cement with the strength not lower than 42.5 grade.
3. The ultra-high performance cement-based material for wet blasting construction as claimed in claim 1,
CaCO of the superfine limestone powder3The content is more than 95 percent, and the average grain diameter is not more than 80 nm.
4. The ultra-high performance cement-based material for wet blasting construction as claimed in claim 1,
the MgO content of the magnesium expanding agent is more than 80%, the average grain diameter is 45-150 mu m, and the 7d restricted expansion rate is more than 0.015%.
5. A preparation method of the ultra-high performance cement-based material applied to the wet spraying construction as claimed in any one of claims 1 to 4, characterized in that coral reef sand and water with 8% of the mass of the coral reef sand are subjected to pre-soaking treatment, and the component A is obtained after the coral reef sand is fully wetted; fully mixing high belite portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent and quartz sand to obtain a component B; and (3) placing the component A and the component B in a stirrer, stirring for 1-2 minutes, adding stirring water, stirring for 3-5 minutes, adding the microfilament steel fiber, and continuously stirring for 2-4 minutes to obtain the ultrahigh-performance concrete.
6. The method for preparing an ultrahigh-performance cement-based material applied to wet blasting construction according to claim 4, wherein the coral reef sand is subjected to pre-wetting treatment with seawater of 8% by mass thereof to obtain a component A; fully mixing high belite portland cement, fly ash floating beads, silica fume, superfine limestone powder, a surfactant, a magnesium expanding agent, a mineral additive and quartz sand to obtain a component B; placing the component B in a stirrer, stirring for 1-2 minutes, adding mixing water, stirring for 3-5 minutes, adding microfilament steel fibers, and continuously stirring for 2-4 minutes to obtain a component C; and finally, adding the component A into the component C, and stirring for 1-2 minutes by using a stirrer to obtain the ultrahigh-performance cement-based material.
7. Use of the ultra high performance concrete according to any one of claims 1 to 4 in wet shotcrete construction.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111620591A (en) * | 2020-04-21 | 2020-09-04 | 中交第二航务工程局有限公司 | Wet-spraying ultrahigh-performance concrete rheological property regulator and using method thereof |
| CN112813792A (en) * | 2021-02-22 | 2021-05-18 | 重庆交通大学 | Method for reinforcing arch bridge by combination of UHPC injection and bar planting |
| CN113321474A (en) * | 2021-07-21 | 2021-08-31 | 四川佰汇混凝土工程有限公司 | Anti-seepage sprayed concrete |
| CN113387646A (en) * | 2021-06-16 | 2021-09-14 | 中铁大桥局集团有限公司 | Light expansion type ultrahigh-performance concrete and preparation method thereof |
| CN113480272A (en) * | 2021-08-17 | 2021-10-08 | 雨发建设集团有限公司 | Self-curing micro-expansive ultrahigh-performance concrete and preparation method thereof |
| CN113716915A (en) * | 2021-08-19 | 2021-11-30 | 华新超可隆新型建材科技(黄石)有限公司 | Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement |
| CN114075059A (en) * | 2020-08-18 | 2022-02-22 | 江苏苏博特新材料股份有限公司 | Ultra-high performance concrete composition capable of being constructed by spraying |
| CN115012581A (en) * | 2022-06-08 | 2022-09-06 | 商丘师范学院 | Fiber reinforced composite material reinforced concrete beam member and preparation method thereof |
| CN115477518A (en) * | 2022-09-29 | 2022-12-16 | 中山大学 | Sprayable ultra-high-toughness cement-based composite material and preparation method and application thereof |
| CN115724627A (en) * | 2022-11-10 | 2023-03-03 | 中国矿业大学 | Preparation method of whole coral seawater sprayed concrete |
| CN116063048A (en) * | 2023-02-08 | 2023-05-05 | 华新水泥股份有限公司 | Ultra-high performance concrete tile and preparation method thereof |
| CN117105609A (en) * | 2023-10-23 | 2023-11-24 | 湖南人健宝固高新科技发展有限公司 | Preparation method of ultra-high performance shotcrete for accelerator-free auxiliary construction |
| CZ310037B6 (en) * | 2022-09-20 | 2024-05-29 | České vysoké učení technické v Praze | A method of reinforcing a building structure |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111620591B (en) * | 2020-04-21 | 2022-04-22 | 中交第二航务工程局有限公司 | Wet-spraying ultrahigh-performance concrete rheological property regulator and using method thereof |
| CN111620591A (en) * | 2020-04-21 | 2020-09-04 | 中交第二航务工程局有限公司 | Wet-spraying ultrahigh-performance concrete rheological property regulator and using method thereof |
| CN114075059B (en) * | 2020-08-18 | 2023-05-30 | 江苏苏博特新材料股份有限公司 | Ultra-high performance concrete composition capable of being used for spray construction |
| CN114075059A (en) * | 2020-08-18 | 2022-02-22 | 江苏苏博特新材料股份有限公司 | Ultra-high performance concrete composition capable of being constructed by spraying |
| CN112813792A (en) * | 2021-02-22 | 2021-05-18 | 重庆交通大学 | Method for reinforcing arch bridge by combination of UHPC injection and bar planting |
| CN113387646A (en) * | 2021-06-16 | 2021-09-14 | 中铁大桥局集团有限公司 | Light expansion type ultrahigh-performance concrete and preparation method thereof |
| CN113321474A (en) * | 2021-07-21 | 2021-08-31 | 四川佰汇混凝土工程有限公司 | Anti-seepage sprayed concrete |
| CN113480272A (en) * | 2021-08-17 | 2021-10-08 | 雨发建设集团有限公司 | Self-curing micro-expansive ultrahigh-performance concrete and preparation method thereof |
| CN113716915A (en) * | 2021-08-19 | 2021-11-30 | 华新超可隆新型建材科技(黄石)有限公司 | Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement |
| CN113716915B (en) * | 2021-08-19 | 2022-09-09 | 华新超可隆新型建材科技(黄石)有限公司 | Sprayed ultrahigh-performance concrete for corrosion prevention and reinforcement |
| CN115012581A (en) * | 2022-06-08 | 2022-09-06 | 商丘师范学院 | Fiber reinforced composite material reinforced concrete beam member and preparation method thereof |
| CZ310037B6 (en) * | 2022-09-20 | 2024-05-29 | České vysoké učení technické v Praze | A method of reinforcing a building structure |
| CN115477518A (en) * | 2022-09-29 | 2022-12-16 | 中山大学 | Sprayable ultra-high-toughness cement-based composite material and preparation method and application thereof |
| CN115724627A (en) * | 2022-11-10 | 2023-03-03 | 中国矿业大学 | Preparation method of whole coral seawater sprayed concrete |
| CN116063048A (en) * | 2023-02-08 | 2023-05-05 | 华新水泥股份有限公司 | Ultra-high performance concrete tile and preparation method thereof |
| CN117105609A (en) * | 2023-10-23 | 2023-11-24 | 湖南人健宝固高新科技发展有限公司 | Preparation method of ultra-high performance shotcrete for accelerator-free auxiliary construction |
| CN117105609B (en) * | 2023-10-23 | 2024-01-05 | 湖南人健宝固高新科技发展有限公司 | Preparation method of ultra-high performance shotcrete for accelerator-free auxiliary construction |
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| CN110845190B (en) | 2022-10-25 |
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