Permeability Experimental Study And Application Research On Carbon Fiber Reinforced Concrete Under Water

Along with the deeping research and development of intelligent composite materials, the carbon fiber reinforced concrete (CFRC) gain widely use in large-sized structural construction. Comentitious composite containing carbon fibers are one kind of smart materials which can monitor itself. Carbon fiber reinforced concrete is a kind of multifunctional concrete that uniformly admixes with definite shape, size and volume of carbon fibers. And it simultaneously possesses the character of sensing ability and good mechanical performance. As the carbon fiber reinforced concrete (CFRC) has an extensive future on the realization of non-destructing test, on-line monitoring and repair of civil engineering, they are attracting more and more attention.According to domestic and international development of carbon fiber reinforced concrete, especially the study on pressure sensitive of carbon fiber concrete, basing on existing electricity conductivity and impermeability of carbon fiber reinforced concrete in the laboratory, the thesis mainly works on the pressure sensitivity of CFRC. The thesis is expanded as following aspeacts:Firstly, the thesis makes a research on the manufacture craft as well as the method of CFRC, it also studys the influence of aggregate size and the adding order of aggregate to the pressure sensitivity of CFRC. Secondly, by making a contrastive analysis under the different environment of water and standard curing room, the thesis makes a research on the influence of water-cement ratio, maintenance ages as well as the electrode position on the pressure sensitivity of CFRC by means of experiments. Beside those, the thesis makes some experiments about carbon fiber concrete test blocks under the condition of exerting cycle load, concluding load-resistance cyclical change rule. It offers theory for the engineering monitoring under water and the application of the intelligence CFRC.The results of the experiment indicate that aggregate size and the adding order of aggregate to the CFRC influence the pressure sensitivity; The factors such asmaintenance environment, electrode position, maintaince ages, loading mode of pressure sensitive and so on have an impact to the pressure sensitivity of carbon fiber reinforced concrete; The CFRC resistance and load performances significant cyclical change and the obvious change rule under cyclic loads, These can be applied in practical engineering structure in the structure of the monitoring and predicting damage.