Compared with the traditional method of increasing the cross-section of concrete or bonding steel concrete for reinforcement, carbon fiber cloth has the advantages of saving space, simple construction, no need for on-site fixed facilities, easy to guarantee the construction quality, basically does not increase the structure size and weight, good corrosion resistance and durability, which can greatly improve the service life of buildings and reduce the reinforcement cost. Therefore, as a new reinforcement material, carbon fiber is favored and concerned.
《GB 50728-2011, the specification requires that the tensile strength of grade I carbon cloth corresponding to precursor shall be no less than 4900mpa, and that of grade II carbon cloth shall be no less than 4100mpa. We can not directly judge the precursor, we can only analyze the carbon cloth data. The inspection report of carbon fiber cloth is an important basis for us to judge whether the carbon cloth is good or not. The specification requires that the tensile strength of grade I carbon cloth shall be no less than 3400mpa, and the tensile strength of grade II carbon cloth shall be no less than 3400mpa The tensile strength of carbon cloth is not less than 3000mpa, so the test report is authoritative for carbon cloth parameters. In addition, basalt fiber can not be purchased. Aramid fiber dyed black to imitate carbon fiber cloth, its tensile strength is far lower than carbon fiber. A good carbon fiber cloth is black and bright. It will not curl and the tow will be uniform.
Sticking carbon fiber cloth construction is a common reinforcement technology in engineering, which directly affects the quality of the project. The specification requires that the effective sticking area of carbon fiber cloth is more than or equal to 95%, so as to avoid bubble wrinkle. Only qualified products and qualified construction can guarantee the qualification of on-site pull-out test, so it is very important to select a professional construction team.
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