Fiber reinforced cement based composite material for reinforcing reinforced concrete structure

A fiber reinforced cement and reinforced concrete technology, which is applied in the field of building materials, can solve the problems of insignificant improvement in the bearing capacity and deformation capacity of reinforced reinforced concrete structures, difficulty in cracking reinforcement of reinforced concrete structures, and unsatisfactory use effects. Compression performance, small crack width, and corrosion reduction effect

Active Publication Date: 2015-11-18
NANJING FORESTRY UNIV
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  • Abstract
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Problems solved by technology

[0004] Due to the influence of factors such as large water-cement ratio, existing fiber-reinforced cement-based composite materials have disadvantages such as low elastic modulus (less than 20GPa), which leads to the improvement of the bearing capacity and deformation capacity of reinforced concrete structures reinforced by fiber-reinforced cement-based composite materials. not obvious
This makes it difficult for the existing fiber-reinforced cement-based composite materials to be used in the reinforcement of cracked reinforced concrete structures in harsh environments; or the use effect is not ideal

Method used

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  • Fiber reinforced cement based composite material for reinforcing reinforced concrete structure
  • Fiber reinforced cement based composite material for reinforcing reinforced concrete structure
  • Fiber reinforced cement based composite material for reinforcing reinforced concrete structure

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Embodiment 1

[0040] A high-performance fiber-reinforced cement-based composite material used for strengthening cracked reinforced concrete structures in harsh environments. The composite material is made of cement, silica fume, expansion agent, high-efficiency water reducer, fine sand, fiber and water. The total mass percentage of cement, silica fume, expansion agent, superplasticizer, fine sand and fiber is 77.6%, and water is 22.4% by mass.

[0041] The cement is a low-heat cement with a strength grade of 42.5. The silica fume is microsilica fume (the average particle size is 0.1um) produced by Norway Elkem Company. The expansion agent is a commercially available sulphoaluminate concrete expansion agent and water reducing agent. It is a polycarboxylate high-efficiency water reducer, the fine sand is quartz sand with a diameter less than 0.5mm, and the fiber is high-strength polyethylene fiber produced by Toyobo Corporation in Japan. The mass percentages of the above-mentioned components ...

Embodiment 2

[0048] A high-performance fiber-reinforced cement-based composite material used for strengthening cracked reinforced concrete structures in harsh environments. The composite material is made of cement, silica fume, expansion agent, high-efficiency water reducer, fine sand, fiber and water. The total mass percentage of cement, silica fume, expansion agent, superplasticizer, fine sand and fiber is 83.7%, and the mass percentage of water is 16.3%.

[0049] The cement is low-heat cement with a strength grade of 42.5, the silica fume is micro-silica fume produced by Elkem Company in Norway, the expansion agent is a commercially available sulphoaluminate concrete expansion agent, and the water reducer is a polycarboxylic acid high-efficiency water reducer. The fine sand is quartz sand with a diameter of less than 0.5mm, and the fiber is high-strength polyethylene fiber produced by Toyobo Corporation in Japan. The mass percentages of the above-mentioned components in the total mass o...

Embodiment 3

[0055] A high-performance fiber-reinforced cement-based composite material used for strengthening cracked reinforced concrete structures in harsh environments. The composite material is made of cement, silica fume, expansion agent, high-efficiency water reducer, fine sand, fiber and water. The total mass percentage of cement, silica fume, expansion agent, superplasticizer, fine sand and fiber is 87.8%, and the mass percentage of water is 12.2%.

[0056] The cement is low-heat cement with a strength grade of 42.5, the silica fume is micro-silica fume produced by Elkem Company in Norway, the expansion agent is a commercially available sulphoaluminate concrete expansion agent, and the water reducer is a polycarboxylic acid high-efficiency water reducer. The fine sand is quartz sand with a diameter of less than 0.5mm, and the fiber is high-strength polyethylene fiber produced by Toyobo Corporation in Japan. The mass percentages of the above-mentioned components in the total mass o...

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Abstract

The invention relates to a high-performance fiber reinforced cement based composite material for reinforcing a cracked reinforced concrete structure under severe environments, and belongs to the technical field of building materials. The composite material is formed by mixing cement, silica powder, swelling agent, water reducing agent, fine sand, fiber and water, wherein the total mass percentage of cement, silica powder, swelling agent, water reducing agent, fine sand and fiber is 77.6% to 88.0%, and the mass percentage of water is 12.0% to 22.4%. The composite material designed by the invention has higher elasticity modulus, higher tensile strength and compression strength, higher self-healing capacity and low permeability. The material is reasonable in component design, simple in construction and maintenance and convenient for large-scale application.

Description

technical field [0001] The invention relates to a high-performance fiber-reinforced cement-based composite material used for reinforcing cracked reinforced concrete structures in severe environments; it belongs to the technical field of building materials. Background technique [0002] After the ordinary reinforced concrete structure cracks, in order to balance the deformation required by the external load, the crack width will expand to the macroscopically visible level, so that the erosive medium (such as water, air, chloride ion, sulfate ion, etc.) penetrates into the reinforced concrete structure through the connected pores. , not only reduces the structural bearing capacity, but also reduces the structural durability. Therefore, for cracked reinforced concrete structures in harsh environments such as humidity, large temperature differences, and poor ventilation, it is necessary to develop structures that not only have high tensile properties (tensile strength, ductility...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/06C04B14/04
Inventor 张永兴
Owner NANJING FORESTRY UNIV
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