CN108529925B - Anti-cracking early strength agent for shield segment concrete and use method thereof - Google Patents

Anti-cracking early strength agent for shield segment concrete and use method thereof Download PDF

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Publication number
CN108529925B
CN108529925B CN201810293866.4A CN201810293866A CN108529925B CN 108529925 B CN108529925 B CN 108529925B CN 201810293866 A CN201810293866 A CN 201810293866A CN 108529925 B CN108529925 B CN 108529925B
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concrete
early strength
shield segment
strength agent
cracking
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CN108529925A (en
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向佳瑜
李曦
王军
蒋震
冷政
袁吉童
刘哲
曾维
田青
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China West Construction Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10Accelerators; Activators
    • C04B2103/12Set accelerators
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00241Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00293Materials impermeable to liquids
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials

Abstract

The invention relates to a concrete anti-cracking early strength agent for a concrete shield segment and a using method thereof. According to mass percentage, the high-performance nano-silica gel is prepared from 30-45% of metakaolin, 12-20% of encrypted silica fume, 10-15% of polyacrylamide and nano SiO25-10% of water glass, 4-8% of water glass, 2-5% of welan gum and the balance of hydroxypropyl cellulose ether, wherein the total mass of the composition meets 100%. When concrete is produced, the anti-cracking early strength agent is doped in the amount of 10-15% to replace cement or other cementing materials, and the concrete for the shield segment is stirred and formed, has good early strength anti-cracking and anti-permeability performance through proper standing time and maintenance process, and can achieve the effect of no steam curing. If the steam curing process is adopted, the shield segment concrete doped with the anti-cracking early strength agent can meet the requirement of form removal strength in about 7 hours earlier than the shield segment concrete not doped with the anti-cracking early strength agent. The related performance of the anti-cracking early strength agent meets the related requirements of GB/T18736 mineral admixture for high-strength high-performance concrete.

Description

Anti-cracking early strength agent for shield segment concrete and use method thereof
Technical Field
The invention relates to the technical field of cement concrete products, in particular to a shield segment concrete anti-cracking early strength agent and a using method thereof.
Background
In recent years, with the development of urbanization process in China, the construction of transportation systems and infrastructures faces a rapidly growing demand. The subway is used as a carrier of urban underground traffic, and becomes an essential component of an urban traffic system with unique geographic advantages, high cost performance and good environmental harmony. Underground water in subway engineering is abundant, and the water is rich in corrosive ions such as chloride ions, sulfate ions, alkali metals and the like. In order to ensure the long-term safe operation of the structure, the anti-permeability performance and the anti-cracking performance of the structure are very important. The construction of underground infrastructures in China enters a high tide period, the shield segment demand is very large, and the construction period is very short. Therefore, the early strength of the concrete is improved, the formwork removal time is shortened, the turnover rate of the formwork is increased, and the shield segment production schedule and cost control requirements are met.
Aiming at the requirements of high crack resistance and early strength of shield segments, the crack resistance measures adopted at present mainly comprise the steps of doping an expanding agent, adopting coating protection and the like, and the early strength measures mainly comprise the steps of steam curing, early strength admixture and the like. The expanding agent often needs to provide more strict requirements for concrete curing, the coating protection process is complex, the manufacturing cost is high, the steam curing increases the complexity and the energy consumption of the concrete production process, and the materials with the early-strength anti-cracking function are fewer. In order to enable the shield segment concrete to have better early strength, reduce production energy consumption and simplify a production process, the invention provides the shield segment concrete anti-cracking early strength agent and the use method thereof, and the shield segment with good anti-cracking and early strength performance can be produced under the condition of no steam curing.
Disclosure of Invention
In order to enable the shield segment concrete to achieve higher early strength under the condition of no steam curing, have the condition of short-time form removal and good anti-cracking performance, the invention provides an anti-cracking early strength agent for shield segment concrete and a using method thereof.
The invention provides a shield segment concrete anti-cracking early strength agent which is prepared from metakaolin, silica fume, polyacrylamide and nano SiO2Sodium silicate, welan gum and hydroxypropyl cellulose ether complexThe composite material is prepared by mixing the following components in percentage by mass:
30% -45% of metakaolin;
12% -20% of silica fume;
10% -15% of polyacrylamide;
nano SiO25%~10%;
4% -8% of water glass;
2% -5% of welan gum;
the rest is hydroxypropyl cellulose ether, and the total weight of the hydroxypropyl cellulose ether meets 100 percent.
In the invention, the metakaolin is prepared by calcining the metakaolin for 2-4 hours at the temperature of 650-850 ℃, wherein the active Al is2O3And active SiO2The content is not less than 90 percent, and the density is 250-270 kg/m3The specific surface area is more than or equal to 1500m2/kg。
In the invention, the silica fume adopts an encryption technology to gather the original state silica fume into small particle groups, wherein SiO is2The content is not less than 85 percent, and the specific surface area is not less than 15000m2/kg。
In the invention, the polyacrylamide is white powder with the density of 1302kg/m3Relative molecular mass 6X 106
In the invention, the nano SiO2Is white powder with average particle diameter of 30 + -5 nm, SiO2The content is more than or equal to 99.5 percent, and the specific surface area is more than or equal to 220000m2/kg。
In the invention, the welan gum is white or off-white powder, and the molecular weight ranges are as follows: 0.66 to 0.97X 106The intrinsic viscosity was 4479L/kg.
In the invention, the water glass is powdery Na with the purity of more than 99 percent and the soluble solid of more than 99 percent2SiO3
In the invention, the hydroxypropyl cellulose ether is white powder, the hydroxypropyl content is 60-70%, the ignition residue is less than 0.5%, the drying weight loss is less than 5%, and the pH value is 5.8-8.5.
The invention provides a preparation method of a shield segment concrete anti-cracking early strength agent, which comprises the following specific steps:
(1) pretreating kaolin to obtain metakaolin, wherein the metakaolin is prepared from 650-8 parts of kaolinCalcining at 50 ℃ for 2-4 h to prepare metakaolin, wherein the active Al is2O3And active SiO2The content is not less than 90 percent, and the specific surface area is more than or equal to 1500m2/kg;
(2) Pretreating silica fume, aggregating the original-state silica fume into small particle groups by adopting an encryption technology to obtain silica fume SiO2The content is more than or equal to 85 percent, and the specific surface area is more than or equal to 15000m2/kg;
(3) Weighing the metakaolin obtained in the step (1), the silica fume obtained in the step (2), polyacrylamide and nano SiO according to the raw material ratio2Water glass, welan gum and hydroxypropyl cellulose ether are evenly mixed to obtain the required product.
The action mechanism of each component is as follows:
metakaolin improves the strength of cement paste; wherein active Al2O3The calcium aluminate cement slurry reacts with cement hydration products, promotes the generation of ettringite with micro-expansion effect, and can reduce the cracking risk of concrete; inhibit alkali-silicic acid reaction. The silica fume has the effect of micro-aggregate, optimizes the grain composition of the cementing material, lubricates cement paste, improves the workability and accelerates the hydration of cement. The polyacrylamide enhances the compactness of a concrete structure, relieves the internal stress and reduces the generation of microcracks. Reduction of Ca (OH)2The enrichment in the interface area improves the interface structure of aggregate and cement paste. Nano SiO2The particle composition of the cementing material is optimized, and the cementing material has high chemical activity and micro-aggregate effect, so that the early strength is improved. The water glass excites the pozzolanic activity of the cementitious material, thereby improving the early strength. The welan gum increases the water retention of the concrete, so that the hydration of the cementing material is quicker and more sufficient, and the strength of the concrete is improved. The hydroxypropyl cellulose ether has surface activity, and the early strength is improved; the peak value of the hydration heat of the cement is reduced, and the cracking risk of the concrete is reduced.
The invention provides a using method of a shield segment concrete anti-cracking early strength agent, which comprises the following specific steps:
(1) the mass ratio of the shield segment concrete crack resistance early strength agent to cement or other cementing materials is controlled (10-16) and 100 is added into the cement or other cementing materials to replace part of the cement or other cementing materials;
(2) adding water into the mixture consisting of the anti-cracking early strength agent obtained in the step (1) and cement or other concrete raw materials, and stirring for more than 60s to obtain premixed concrete;
(3) conveying the premixed concrete obtained in the step (2) into a mould for pouring, and vibrating and compacting by adopting a vibrator (adopting the prior known technology);
(4) standing the concrete poured and formed in the step (3) for 2h, and performing secondary plastering before initial setting in the time period, wherein the time is 60-80 minutes, so that the influence on the appearance of the shield segment caused by concrete post-retention bleeding is prevented, and the generation of sand spots and sand lines and plastic cracks is reduced; standing for 2h, laminating, moisturizing, and curing with a mold for 16-20h until the requirement of mold removal is met;
(5) after the shield segment is demoulded, the shield segment is placed into the environment with the standard conditions of temperature and humidity (the temperature is 20 +/-2 ℃ and the relative humidity is more than 95 percent RH) and is maintained to the design age (by adopting the prior known technology), the finished product is sprayed on the surface by adopting a silane impregnant to prevent Ca (OH)2Precipitation affects appearance.
The concrete doped with the anti-cracking early strength agent does not need steam curing after being poured, but measures such as film covering and moisture retention or curing with a mold are adopted on the surface of the concrete after pouring.
The invention has the beneficial effects that: the anti-cracking early strength agent can realize that the shield segment concrete reaches the requirements of form removal and hoisting strength for 20 hours under the conditions of standard conditions of temperature and humidity, and the surface of the concrete has no obvious cracks. The prior art generally needs steam curing for 5 hours, and after the concrete is statically stopped for 15 hours, the requirements of form removal and hoisting strength are met, and the shield segment is easy to crack due to large heat release of concrete hydration. If the invention adopts the prior known technology for steam curing for 5 hours, the requirements of form removal and hoisting strength can be met only by curing for 8 hours under the standard conditions of temperature and humidity, and the time for form removal can be further shortened. The invention can better solve the contradiction between early strength and crack resistance of the shield segment concrete, reduces the production energy consumption by avoiding steam curing, simplifies the manufacturing process, has simple use method and stronger practicability.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited thereto.
Example 1: preparation of anti-cracking early-strength concrete for shield segment C50P12
(1) The concrete anti-cracking early strength agent comprises the following components in percentage by mass:
wherein:
metakaolin: is prepared from kaolin through calcining at 750 deg.C for 2.5 hr, in which active Al is2O3And active SiO2Content 91%, specific surface area 1700m2/kg;
Silica fume: commercially available, the raw-state silica fume is agglomerated into small particle clusters, SiO, by means of an agglomeration technique2Content 88%, specific surface 16000m2/kg;
Polyacrylamide: commercially available, white powder, density 1302kg/m3Relative molecular mass 6X 106
Nano SiO2: commercially available, white powder, average particle size 30nm, SiO2Content 99.7%, specific surface area 230000m2/kg;
Water glass: commercially available, analytically pure, powdery, with a purity of 99.5%;
welan gum: commercially available, white or off-white powder, molecular weight: 0.95X 106The intrinsic viscosity is 4479L/kg;
hydroxypropyl cellulose ether: commercially available, white powder, hydroxypropyl content 68%, ignition residue 0.3%, loss on drying 4%, pH = 6.0.
Weighing metakaolin, silica fume, polyacrylamide and nano SiO according to the raw material ratio2The required anti-cracking early strength agent is obtained by uniformly mixing water glass, welan gum and hydroxypropyl cellulose ether.
(2) The concrete mixing proportion is as follows:
wherein:
cement: commercially available, P.O42.5 cement with specific surface area of 320m2The compression strength is 50.0MPa at kg and 28 d;
fly ash: commercially available, II-grade coal ash of a power plant, the fineness is 17 percent, the loss on ignition is 3.5 percent, and the 28d activity index is 76.0 percent;
water reducing agent: the water reducing rate of the commercially available high-performance polycarboxylic acid water reducing agent is 26.0 percent;
sand: commercially available, river sand, fineness modulus 2.6;
crushing stone: commercially available, 5-25 mm continuous grade, crush value 9.0%.
(3) The materials are weighed according to the proportion and then stirred for 80s, the concrete slump is 80mm, and the shield segment prefabrication construction requirements are met.
(4) Pouring, vibrating and forming concrete, performing secondary plastering after standing for 1h, laminating after standing for 2h, and removing a mold after curing for 18h with the mold under standard conditions without steam curing under the temperature and humidity, wherein the compressive strength of 20h is 22.5MPa, the compressive strength of 28d is 77.9MPa, and no obvious crack is formed on the surface of the concrete.
(5) Meanwhile, the prepared anti-cracking early-strength concrete of the shield segment C50P12 is cured by adopting the steam of the prior known technology for 5 hours, and then is statically stopped for 8 hours under the standard conditions of temperature and humidity for the compressive strength of 21.9MPa and 28d for the compressive strength of 78.8MPa, and no obvious crack is formed on the surface of the concrete.
The C50P12 anti-crack early strength concrete is prepared according to example 1, corresponding test pieces are formed, and water permeation resistance, chloride ion permeation resistance (electric flux), early shrinkage test (non-contact method) and carbonization resistance test are respectively performed with reference to GBT50082-2009 standard of test method for long-term performance and durability of ordinary concrete, and the related detection results are as follows:
water permeation resistance H: 1.6 MPa;
resistance to chloride ion penetration (electric flux): 6h, total electric flux 485C;
shrinkage (3 d): 0.00010;
carbonization depth (28 d): 6.8 mm.
Example 2: preparation of anti-cracking early-strength concrete for shield segment C60
(1) The concrete anti-cracking early strength agent comprises the following components in percentage by mass:
wherein:
metakaolin: is prepared from kaolin through calcining at 750 deg.C for 2.5 hr, in which active Al is2O3And active SiO2Content 91%, specific surface area 1700m2/kg;
Silica fume: commercially available, the raw-state silica fume is agglomerated into small particle clusters, SiO, by means of an agglomeration technique2Content 88%, specific surface 16000m2/kg;
Polyacrylamide: commercially available, white powder, density 1302kg/m3Relative molecular mass 6X 106
Nano SiO2: commercially available, white powder, average particle size 30nm, SiO2Content 99.7%, specific surface area 230000m2/kg;
Water glass: commercially available, analytically pure, powdery, with a purity of 99.5%;
welan gum: commercially available, white or off-white powder, molecular weight: 0.95X 106The intrinsic viscosity is 4479 l/kg;
hydroxypropyl cellulose ether: commercially available, white powder, hydroxypropyl content 68%, ignition residue 0.3%, loss on drying 4%, pH = 6.0.
Weighing metakaolin, silica fume, polyacrylamide and nano SiO according to the raw material ratio2The required anti-cracking early strength agent is obtained by uniformly mixing water glass, welan gum and hydroxypropyl cellulose ether.
(2) The concrete mixing proportion is as follows:
wherein:
cement: commercially available, P.O42.5 cement with specific surface area of 320m2The compression strength is 50.0MPa at kg and 28 d;
fly ash: commercially available, II-grade coal ash of a power plant, the fineness is 17 percent, the loss on ignition is 3.5 percent, and the 28d activity index is 76.0 percent;
water reducing agent: the water reducing rate of the commercially available high-performance polycarboxylic acid water reducing agent is 26.0 percent;
sand: commercial, river sand, fineness 2.6;
crushing stone: commercially available, 5-25 mm continuous grade, crush value 9.0%.
(3) The materials are weighed according to the proportion and then stirred for 100s, the slump expansion degree of the concrete is 100mm, and the construction requirement of the shield segment is met.
(4) Pouring, vibrating, forming and laminating maintenance of the concrete.
(5) The anti-cracking early-strength concrete for the shield segment C60 is successfully prepared, secondary plastering is carried out after the shield segment C60 is statically stopped for 1h, a film is coated after the shield segment C60 is statically stopped for 2h, steam curing is not needed under standard conditions of temperature and humidity, and the mold is removed after the shield segment C60 is maintained with the mold for 18 h. The compressive strength of 26.5MPa after 20h and the compressive strength of 86.5MPa after 28d are measured, and no obvious crack is formed on the surface of the concrete.
Meanwhile, the prepared anti-cracking early-strength concrete of the shield segment C60 is cured by adopting the steam of the prior known technology for 5 hours, and then is statically stopped under the standard conditions of temperature and humidity for 8 hours, the compressive strength is 26.8MPa, the compressive strength is 85.4MPa after 28 days, and no obvious crack is formed on the surface of the concrete.
The C60P12 anti-crack early strength concrete is prepared according to example 2, a corresponding test piece is formed, and water permeation resistance, chloride ion permeation resistance (electric flux), early shrinkage test (non-contact method) and anti-carbonization test are respectively performed with reference to GBT50082-2009 standard of test method for long-term performance and durability of ordinary concrete, and the related detection results are as follows:
water permeation resistance H: 1.6 MPa;
resistance to chloride ion penetration (electric flux): 6h Total electric flux 439C;
shrinkage (3 d): 0.00015;
carbonization depth (28 d): 6.0 mm.

Claims (6)

1. The anti-cracking early strength agent for shield segment concrete is characterized by comprising metakaolin, silica fume, polyacrylamide and nano SiO2Sodium silicate, welan gum and hydroxypropyl cellulose ether complexThe composite material is prepared by mixing the following components in percentage by mass:
30% -45% of metakaolin;
12% -20% of silica fume;
10% -15% of polyacrylamide;
nano SiO25%~10%;
4% -8% of water glass;
2% -5% of welan gum;
the balance is hydroxypropyl cellulose ether, and the total weight of the hydroxypropyl cellulose ether is 100 percent; the metakaolin is prepared by calcining kaolin at 650-850 ℃ for 2-4 hours, wherein the active Al is2O3And active SiO2The content is not less than 90 percent, and the specific surface area is more than or equal to 1500m2Per kg; the silica fume adopts an encryption technology to aggregate original state silica fume into small particle groups, namely SiO2The content is not less than 85 percent, and the specific surface area is not less than 15000m2Per kg; the polyacrylamide is white powder with the density of 1302kg/m3Relative molecular mass 6X 106
2. The shield segment concrete anti-cracking early strength agent as claimed in claim 1, wherein the nano SiO is2Is white powder with average particle diameter of 30 + -5 nm, SiO2The content is more than or equal to 99.5 percent, and the specific surface area is more than or equal to 220000m2/kg。
3. The shield segment concrete anti-cracking early strength agent as claimed in claim 1, wherein the water glass is powdered Na with purity of more than 99% and soluble solid content of 99%2SiO3
4. The shield segment concrete anti-cracking early strength agent according to claim 1, characterized in that the welan gum is white or off-white powder, and the molecular weight range is as follows: 0.66 to 0.97X 106The intrinsic viscosity was 4479L/kg.
5. The anti-cracking early strength agent for shield segment concrete according to claim 1, wherein the hydroxypropyl cellulose ether is white powder, the hydroxypropyl content is 60-70%, the ignition residue is less than 0.5%, the drying weight loss is less than 5%, and the pH value is 5.8-8.5.
6. The use method of the shield segment concrete anti-cracking early strength agent according to claim 1 is characterized by comprising the following steps:
(1) adding the anti-cracking early strength agent of the shield segment concrete and cement or other cementing materials into the cement or other cementing materials according to the mass ratio of (10-15) to (100) so as to replace part of the cement or other cementing materials, and enabling the concrete performance to meet the shield segment concrete prefabrication requirement under the condition of no steam curing;
(2) mixing cement or other cementing materials with the concrete anti-cracking early strength agent, wherein the stirring time is not less than 60 s;
(3) uniformly stirring the materials obtained in the step (2), pouring the materials into a mold, standing the poured and formed concrete for 1h, and performing secondary plastering before initial setting; standing for 2h, laminating and moisturizing, and curing with a mold for 16-20 h; after forming, the strength requirements of mold stripping and hoisting are met within 20 hours;
(4) the prepared shield segment adopts silane impregnant to spray the surface, so that the appearance of concrete is improved.
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CN110040997A (en) * 2019-05-23 2019-07-23 广州市建筑科学研究院有限公司 A kind of metakaolin nanometer nucleation early strength agent and its preparation method and application

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CN1868956A (en) * 2006-06-06 2006-11-29 武汉市城市建设投资开发集团有限公司 Early strength asater resistant dispersion and anti-dissolving shielding tunnel back lining filling material and its preparation method
KR20130121419A (en) * 2012-04-27 2013-11-06 주식회사 유니온 High performance composite material for shotcrete and high performance shotcrete using it
CN105859227A (en) * 2016-04-01 2016-08-17 成都理工大学 High-early strength nano-composite cement-based water shutoff reinforcing material
CN107311561A (en) * 2017-06-22 2017-11-03 同济大学 It is a kind of for 3D printing cement-based material of underwater construction and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1868956A (en) * 2006-06-06 2006-11-29 武汉市城市建设投资开发集团有限公司 Early strength asater resistant dispersion and anti-dissolving shielding tunnel back lining filling material and its preparation method
KR20130121419A (en) * 2012-04-27 2013-11-06 주식회사 유니온 High performance composite material for shotcrete and high performance shotcrete using it
CN105859227A (en) * 2016-04-01 2016-08-17 成都理工大学 High-early strength nano-composite cement-based water shutoff reinforcing material
CN107311561A (en) * 2017-06-22 2017-11-03 同济大学 It is a kind of for 3D printing cement-based material of underwater construction and preparation method thereof

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