CN115108778B - High-ductility concrete composite material and preparation method thereof - Google Patents
High-ductility concrete composite material and preparation method thereof Download PDFInfo
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- CN115108778B CN115108778B CN202210668835.9A CN202210668835A CN115108778B CN 115108778 B CN115108778 B CN 115108778B CN 202210668835 A CN202210668835 A CN 202210668835A CN 115108778 B CN115108778 B CN 115108778B
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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
Abstract
The invention discloses a high-ductility concrete composite material and a preparation method thereof, wherein polypropylene fibers are subjected to irradiation treatment, acrylic acid is grafted, so that the activity of the polypropylene fibers is improved, then carboxyl on the radiation-modified polypropylene fibers is reacted with amino-modified boron nitride under the action of a silane coupling agent, and the amino-modified boron nitride is grafted on the polypropylene fibers; meanwhile, a network is formed by crosslinking carboxyl and amino, so that the ductility of a polypropylene fiber molecular chain segment is improved, the effect of hydrogen bonds in molecules is weakened, and the freezing resistance of concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to a high-ductility concrete composite material and a preparation method thereof.
Background
The high-ductility concrete is special concrete with high strength, high toughness, high crack resistance and high damage resistance, and is particularly characterized in that the high-ductility concrete has large deformation degree, and is not easy to break when facing external impacts such as earthquakes and the like, so that the integral structural stability of the concrete is greatly improved, and the protection effect on lives and properties of people is achieved.
As one of the most common building materials, cement concrete exhibits a brittle characteristic under tensile or bending load, and in order to improve the brittleness of the concrete material, it is a common way to add a certain amount of chopped fibers (i.e. fiber concrete) into the concrete material, while in the preparation process of high-ductility concrete material, the most common fibers are polypropylene fibers, but the polypropylene fibers have poor binding ability with cement base, and the toughness and ductility of the concrete are improved little by adding the polypropylene fibers alone, so that it is necessary to further modify the concrete.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-ductility concrete composite material and a preparation method thereof, and solves the technical problems of poor mechanical property and low-temperature resistance of the existing concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-ductility concrete composite material comprises the following raw materials in parts by weight: 60-80 parts of cement, 15-25 parts of fly ash, 8-12 parts of quartz sand, 10-20 parts of boron nitride modified polypropylene fiber, 1-2 parts of polycarboxylic acid water reducing agent, 2-3 parts of waterproof agent and 30-40 parts of water.
Preferably, the preparation method of the boron nitride modified polypropylene fiber comprises the following steps:
(1) Radiation modification of polypropylene fibers: immersing polypropylene fibers in a 20-30wt% aqueous acrylic solution 60 Carrying out irradiation reaction under a Co gamma-ray irradiation source, and after the reaction is finished, filtering, washing and drying a reaction product to obtain radiation modified polypropylene fibers;
(2) Preparation of amino modified boron nitride: ultrasonically dispersing boron nitride in deionized water, adjusting the pH value of the solution to 4-5, then adding polyethyleneimine and epoxy chloropropane into the solution, heating and stirring the solution for reaction, and after the reaction is finished, washing and drying a reaction product to obtain amino modified boron nitride;
(3) Preparing the boron nitride modified polypropylene fiber: uniformly dispersing the radiation modified polypropylene fiber and the amino modified boron nitride in a mixed solvent of methanol and water, then adding a silane coupling agent, heating and stirring for reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the boron nitride modified polypropylene fiber.
Preferably, in the step (1), the irradiation dose is 400 to 600KGy/h, and the irradiation time is 4 to 6h. Preferably, in the step (2), the mass ratio of the boron nitride to the polyethyleneimine to the epichlorohydrin is 10-15.
Preferably, in the step (2), the heating reaction temperature is 60-80 ℃, and the heating reaction time is 3-5h. Preferably, in the step (3), the mass ratio of the radiation modified polypropylene fiber to the amino modified boron nitride to the silane coupling agent is 10-20.
Preferably, in the step (3), the silane coupling agent is KH560 or KH570.
Preferably, in the step (3), the temperature for heating and stirring reaction is 50-70 ℃, and the stirring reaction time is 45-90min.
Preferably, the cement is selected from p.c52.5 cement.
The invention also provides a preparation method of the high-ductility concrete composite material, which comprises the following steps: mixing cement, fly ash, quartz sand and water, stirring for 30-60s, then adding the boron nitride modified polypropylene fiber, the polycarboxylic acid water reducing agent and the waterproof agent, and stirring for 30-60s to obtain the high-ductility concrete.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention firstly carries out irradiation treatment on the polypropylene fiber, improves the activity of the polypropylene fiber by grafting acrylic acid, and then carries out reaction on carboxyl on the radiation modified polypropylene fiber and amino modified boron nitride under the action of a silane coupling agent to graft the amino modified boron nitride on the polypropylene fiber.
(2) According to the invention, the polypropylene fiber is subjected to graft modification, and the lamellar boron nitride with good dispersibility is introduced on the surface of the polypropylene fiber, so that the bonding strength of the polypropylene fiber and concrete is improved; meanwhile, a network is formed by crosslinking carboxyl and amino, so that the ductility of a polypropylene fiber molecular chain segment is improved, the effect of hydrogen bonds in molecules is weakened, and the freezing resistance of concrete is improved.
(3) According to the invention, the boron nitride is modified by using the polyethyleneimine, and then the boron nitride is grafted on the polypropylene fiber, the longer carbon chain of the polyethyleneimine provides excellent flexibility for the polypropylene fiber, and meanwhile, the layered structure of the boron nitride and the long chain structure of the polyethyleneimine jointly enhance the bonding strength of the polypropylene fiber and a cement base, so that when the concrete is subjected to an external force, the crack expansion of the concrete can be effectively resisted, and the toughness and ductility of the concrete are improved.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.
The present invention will be described in more detail with reference to specific preferred embodiments, but the present invention is not limited to the following embodiments.
It should be noted that, unless otherwise specified, the chemical reagents involved in the present invention are commercially available.
The adopted type of the cement is P.C52.5;
the fly ash is purchased from Shijiazhuang Lin mineral products, inc., and has the density of 2.45kg/m < 3 >;
the selected quartz sand has a granularity of 40-60 meshes and is purchased from Hengwang Fujian materials of Wuhan Co Ltd; the adopted boron nitride is hexagonal boron nitride and is purchased from Shandong Liang New Material science and technology Limited; polypropylene fiber was purchased from singxin chemical ltd, deng, shan;
polyethyleneimine is available from Conditis chemical (Hubei) Inc.; the polycarboxylate superplasticizer is purchased from Jinwei industry chemical company Limited in Jinan province; waterproofing agent FS102 was purchased from the oceam industries ltd.
Example 1
A preparation method of a high-ductility concrete composite material comprises the following steps:
(1) Preparation of boron nitride modified polypropylene fiber
Soaking 20g of polypropylene fiber into 20wt% of acrylic acid aqueous solution, carrying out irradiation reaction under a 60Co gamma-ray irradiation source, wherein the irradiation dose is 400KGy/h, the irradiation time is 4h, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the radiation modified polypropylene fiber;
ultrasonically dispersing 10g of boron nitride in 300mL of deionized water, adjusting the pH value of the solution to 4, then adding 8g of polyethyleneimine and 5g of epichlorohydrin, heating and stirring at 60 ℃ for reaction for 3h, washing and drying a reaction product after the reaction is finished, and thus obtaining amino modified boron nitride;
uniformly dispersing 10g of radiation modified polypropylene fiber and 6g of amino modified boron nitride in a mixed solvent of 50mL of methanol and 100mL of water, then adding 3g of silane coupling agent KH560, heating and stirring at 50 ℃ for reaction for 45min, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the boron nitride modified polypropylene fiber.
(2) Preparation of high-ductility concrete composite material
Mixing 600g of cement, 150g of fly ash, 80g of quartz sand and 300g of water, stirring for 40s, then adding 100g of boron nitride modified polypropylene fiber, 10g of polycarboxylic acid water reducing agent and 20g of waterproof agent FS102, and stirring for 30s to obtain the high-ductility concrete.
Example 2
A preparation method of a high-ductility concrete composite material comprises the following steps:
(1) Preparation of boron nitride modified polypropylene fiber
Soaking 20g of polypropylene fiber into 25wt% of acrylic acid aqueous solution, carrying out irradiation reaction under a 60Co gamma-ray irradiation source, wherein the irradiation dose is 500KGy/h, the irradiation time is 5h, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the radiation modified polypropylene fiber;
ultrasonically dispersing 15g of boron nitride in 300mL of deionized water, adjusting the pH value of the solution to 5, then adding 10g of polyethyleneimine and 8g of epichlorohydrin, heating and stirring at 80 ℃ for reaction for 4 hours, washing and drying a reaction product after the reaction is finished, and thus obtaining amino modified boron nitride;
uniformly dispersing 15g of radiation modified polypropylene fiber and 8g of amino modified boron nitride in a mixed solvent of 50mL of methanol and 100mL of water, adding 4g of silane coupling agent KH570, heating and stirring at 50 ℃ for reaction for 60min, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the boron nitride modified polypropylene fiber.
(2) Preparation of high-ductility concrete composite material
Mixing 800g of cement, 200g of fly ash, 100g of quartz sand and 350g of water, stirring for 50s, then adding 150g of boron nitride modified polypropylene fiber, 15g of polycarboxylic acid water reducing agent and 25g of waterproof agent FS102, and stirring for 40s to obtain the high-ductility concrete.
Example 3
A preparation method of a high-ductility concrete composite material comprises the following steps:
(1) Preparation of boron nitride modified polypropylene fiber
Soaking 20g of polypropylene fiber into 30wt% of acrylic acid aqueous solution, carrying out irradiation reaction under a 60Co gamma-ray irradiation source, wherein the irradiation dose is 600KGy/h, the irradiation time is 5h, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the radiation modified polypropylene fiber;
ultrasonically dispersing 12g of boron nitride in 300mL of deionized water, adjusting the pH value of the solution to 5, then adding 12g of polyethyleneimine and 10g of epichlorohydrin, heating and stirring at 80 ℃ for reaction for 5 hours, washing and drying a reaction product after the reaction is finished, and thus obtaining amino modified boron nitride;
uniformly dispersing 20g of radiation modified polypropylene fiber and 10g of amino modified boron nitride in a mixed solvent of 50mL of methanol and 100mL of water, then adding 5g of silane coupling agent KH560, heating and stirring at 60 ℃ for reaction for 60min, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the boron nitride modified polypropylene fiber.
(2) Preparation of high-ductility concrete composite material
Mixing 700g of cement, 250g of fly ash, 120g of quartz sand and 350g of water, stirring for 30s, then adding 180g of boron nitride modified polypropylene fiber, 20g of polycarboxylic acid water reducing agent and 25g of waterproof agent FS102, and stirring for 45s to obtain the high-ductility concrete.
Example 4
A preparation method of a high-ductility concrete composite material comprises the following steps:
(1) Preparation of boron nitride modified polypropylene fiber
Soaking 20g of polypropylene fiber into 25wt% of acrylic acid aqueous solution, carrying out irradiation reaction under a 60Co gamma-ray irradiation source, wherein the irradiation dose is 500KGy/h, the irradiation time is 5h, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the radiation modified polypropylene fiber;
ultrasonically dispersing 15g of boron nitride in 300mL of deionized water, adjusting the pH value of the solution to 5, then adding 10g of polyethyleneimine and 8g of epichlorohydrin, heating and stirring at 70 ℃ for reaction for 5 hours, washing and drying a reaction product after the reaction is finished, and thus obtaining amino modified boron nitride;
uniformly dispersing 18g of radiation modified polypropylene fiber and 10g of amino modified boron nitride in a mixed solvent of 50mL of methanol and 100mL of water, then adding 4g of silane coupling agent KH570, heating and stirring at 60 ℃ for reaction for 90min, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the boron nitride modified polypropylene fiber.
(2) Preparation of high-ductility concrete composite material
Mixing 800g of cement, 200g of fly ash, 100g of quartz sand and 350g of water, stirring for 45s, and then adding 160g of boron nitride modified polypropylene fiber, 15g of polycarboxylic acid water reducing agent and 25g of waterproof agent
FS102, stirring for 60s to obtain the high-ductility concrete.
Comparative example 1
A preparation method of a concrete composite material comprises the following steps:
mixing 700g of cement, 250g of fly ash, 120g of quartz sand and 350g of water, stirring for 30s, then adding 180g of polypropylene fiber, 20g of polycarboxylic acid water reducing agent and 25g of waterproof agent FS102, and stirring for 45s to obtain the concrete composite material.
Comparative example 2
A preparation method of a concrete composite material comprises the following steps:
mixing 700g of cement, 250g of fly ash, 120g of quartz sand and 350g of water, stirring for 30s, then adding 120g of polypropylene fiber, 60g of boron nitride, 20g of polycarboxylic acid water reducing agent and 25g of waterproof agent FS102, and stirring for 45s to obtain the concrete composite material.
The concrete prepared in examples 1 to 4 and comparative examples 1 to 2 was poured on the surface of the steel bar network structure, respectively, to prepare a concrete test block, and then performance tests were performed:
and (3) testing the compressive strength: manufacturing a standard test block according to GB/T50081-2019 standard of mechanical property test method for common concrete, and measuring the compressive strength of the standard test block for 28d of maintenance;
and (3) testing the breaking strength: manufacturing a standard test block according to GB/T50081-2019 'Standard of mechanical Property test method of common concrete', and measuring the flexural strength of the standard test block for 28d of maintenance;
and (3) tensile strain test: performing a tensile test according to SL/T352-2020 Water conservancy project concrete test procedure, wherein the maintenance time of the concrete test block is 28d;
and (3) low temperature resistance test: maintaining the concrete standard test blocks prepared in the examples 1-4 and the comparative examples 1-2 for 28d, placing the concrete standard test blocks in a low-temperature box, reducing the temperature to-80 ℃ at a cooling rate of 1 ℃/min, keeping the temperature constant for 2h, taking out the test pieces, wrapping the test pieces with a plastic film, placing the test pieces at normal temperature for 48h, and testing the compressive strength of the test blocks; the test results are shown in the following table:
as can be seen from the table, the concrete composite material prepared by the embodiment has good toughness and ductility, and also has good low temperature resistance.
Finally, it should be noted that: the above examples do not limit the invention in any way. It will be apparent to those skilled in the art that various modifications and improvements can be made to the present invention. Accordingly, any modification or improvement made without departing from the spirit of the present invention is within the scope of the claimed invention.
Claims (9)
1. The high-ductility concrete composite material is characterized by comprising the following raw materials in parts by weight: 60-80 parts of cement, 15-25 parts of fly ash, 8-12 parts of quartz sand, 10-20 parts of boron nitride modified polypropylene fiber, 1-2 parts of polycarboxylic acid water reducing agent, 2-3 parts of waterproof agent and 30-40 parts of water;
the preparation method of the boron nitride modified polypropylene fiber comprises the following steps:
(1) Radiation modification of polypropylene fibers: immersing polypropylene fibers in a 20-30wt% aqueous acrylic solution 60 Carrying out irradiation reaction under a Co gamma-ray irradiation source, and after the reaction is finished, filtering, washing and drying a reaction product to obtain radiation modified polypropylene fibers;
(2) Preparation of amino modified boron nitride: ultrasonically dispersing boron nitride in deionized water, adjusting the pH value of the solution to 4-5, then adding polyethyleneimine and epoxy chloropropane into the solution, heating and stirring the solution for reaction, and after the reaction is finished, washing and drying a reaction product to obtain amino modified boron nitride;
(3) Preparing the boron nitride modified polypropylene fiber: uniformly dispersing the radiation modified polypropylene fiber and the amino modified boron nitride in a mixed solvent of methanol and water, then adding a silane coupling agent, heating and stirring for reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the boron nitride modified polypropylene fiber.
2. The high ductility concrete composite material according to claim 1, wherein in the step (1), the irradiation dose is 400-600KGy/h and the irradiation time is 4-6h.
3. The high-ductility concrete composite material according to claim 1, wherein in the step (2), the mass ratio of the boron nitride to the polyethyleneimine to the epichlorohydrin is 10-15.
4. The high-ductility concrete composite material as claimed in claim 1, wherein in the step (2), the heating reaction temperature is 60-80 ℃ and the heating reaction time is 3-5h.
5. The high-ductility concrete composite material according to claim 1, wherein in the step (3), the mass ratio of the radiation-modified polypropylene fiber to the amino-modified boron nitride to the silane coupling agent is 10-20.
6. The high ductility concrete composite material according to claim 1, wherein in the step (3), the silane coupling agent is KH560 or KH570.
7. The high-ductility concrete composite material as claimed in claim 1, wherein in the step (3), the temperature for heating and stirring reaction is 50-70 ℃ and the stirring reaction time is 45-90min.
8. The high ductility concrete composite according to claim 1, wherein the cement is selected from p.c52.5 cement.
9. The method for preparing a high ductility concrete composite according to any of the claims 1 to 8, characterized by comprising the steps of: mixing cement, fly ash, quartz sand and water, stirring for 30-60s, then adding the boron nitride modified polypropylene fiber, the polycarboxylic acid water reducing agent and the waterproof agent, and stirring for 30-60s to obtain the high-ductility concrete.
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| WO2004031095A1 (en) * | 2002-10-02 | 2004-04-15 | Hagihara Industries Inc. | Polypropylene fiber for cement reinforcement, fiber-reinforced molded cement made with the polypropylene fiber for cement reinforcement, method of constructing concrete structure with the polypropylene fiber for cement reinforcement, and method of concrete spraying with the polypropylene fiber for cement reinforcement |
| CN108793895A (en) * | 2018-08-25 | 2018-11-13 | 北京建工新型建材有限责任公司 | A kind of concrete with high cracking resistance |
| CN113105163A (en) * | 2020-03-18 | 2021-07-13 | 殷石 | High-strength modified synthetic fiber reinforced high-ductility concrete |
| CN111548084A (en) * | 2020-04-13 | 2020-08-18 | 上海二十冶建设有限公司 | Jet reinforced high-ductility concrete and preparation method thereof |
| CN111423192B (en) * | 2020-06-01 | 2020-12-01 | 中铁二局集团有限公司 | Method for improving deformation capacity of high-ductility concrete |
| CN112341832B (en) * | 2020-11-25 | 2022-05-27 | 河南省第一公路工程有限公司 | Freeze-thaw abrasion resistant pavement repair material and production process and application thereof |
| CN112409007A (en) * | 2020-12-03 | 2021-02-26 | 侯光宇 | Preparation method of toughened BNNSs/SiC ceramic matrix composite |
| CN112679154B (en) * | 2021-02-02 | 2022-03-08 | 广州市恒鼎建设工程有限公司 | High-ductility concrete reinforced by carbon fibers and preparation method thereof |
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