Size Effect Of Carbon Fiber Reinforced Cement-based Composite On The Electrical Properties Of Force

Concrete is the most widely used in civil engineering materials. But the concrete structure in the course of their service, as load, environmental corrosion and fatigue damage and other unfavorable factors makes the structure of material degradation, the use of function to reduce a serious impact on their lifespan, making the concrete structure of the safety and durability decrease. Therefore, the new concrete structure has been under construction to monitor the timely detection of structural safety problems, the damage that may occur in advance warning, is to monitor the structural safety of an effective method. Carbon fiber reinforced cement-based composite is a new performance of smart materials and can be used as online damage detection sensors. The technology has attracted more and more attention to domestic and foreign scholars, and its applied research is continually expanding. In this paper, Natural Science Foundation of Jiangxi Province: mechanical and electrical properties of carbon fiber reinforced concrete the size effect (2009GZC0019) of carbon fiber reinforced cement based composites and their mechanical and electrical conductivity properties of the size effect in-depth study, The main contents of this paper include:1. Discuss conductive of carbon fiber composite mechanism and mechanism of electromechanical effects, production process and influencing factors, that the power of carbon fiber composite material before the electrical properties, preparation dispersed, cohesive performance and high sensitivity of such materials is to study one of study one of the key issues, the dispersion of carbon fiber, carbon fiber content and length, water-cement ratio, curing age and other carbon fiber composites have significant effect on the resistivity.2. Designed and produced 54 geometrically similar carbon fiber reinforced mortar prism specimens, through the test of carbon fiber reinforced cement mortar prism in one direction under the action of the stress-strain, static modulus of elasticity, ultimate load and the volume resistivity and other mechanical properties, resistance to change rate of electrical parameters and the structure size and stress state of the correspondence. Stability analysis of the geometric similarity of carbon fiber reinforced cement mortar prism under uniaxial compression force motor sensitivity, and it has been carbon fiber reinforced mortar prism monotonic compression loading, cyclic loading amplitude variation in resistance rates and stress - strain relations and the corresponding size effect phenomenon.3. Designed and produced 30 geometrically similar carbon fiber reinforced concrete (coarse aggregate) prism specimens, and produced a 30 carbon fiber concrete prism specimens, through the test of carbon fiber reinforced concrete (coarse aggregate) prism of the stress - strain, ultimate load, volume resistivity and resistance to change rate and structure size and stress state of the correspondence. Stability analysis of the geometric similarity of carbon fiber reinforced concrete (coarse aggregate) prism specimens under uniaxial compression force motor sensitivity, have been carbon-fiber reinforced concrete (coarse aggregate) prism monotonic compression loading, etc. amplitude cyclic loading process the change in the resistivity and stress - strain relations and the corresponding size effect phenomenon.