Distributed Models Of Self-stress In Textile-reinforced Self-stressing Concrete

The concrete members are working with cracks because of the lower tensile strength of this material, which leads to steel bars are corroded. As a result, the bending property drops substantially and the durability ability declines damagingly, so huge dangers of security in concrete structures are hidden unconsciously. The textile with better anti-corrosion properties and expansive self-stressing concrete matrix are combined together to form a new material(textile reinforced self-stressing concrete, TRSSC). The directional and quantitive self-stress in matrix is generated by the restricting function that textile acts on the expensive concrete, which improves the crack resistant capacity and durability of the composite material greatly. It is not only suitable for hydro-structure, such as dam or irrigation canal, but also adapted to strengthening and repairing the existing structures. In order to explore the distribution regular of self-stress value in matrix, several experiment and theory researches are conducted based on the State Key Program of National Natural Science(41430642), the National Natural Science Foundation of China(51108207), China`s Postdoctoral Science Fund Program(2015M581403) and the State Key Laboratory of Frozen Soil Engineering Foundation(SKLFSE201514).(1) The mechanical properties of two kinds of self-stress concrete matrix with different expensive capacity and comparable normal concrete are conducted according to the standard test methods of mechanical properties of ordinary concrete, which contain the cubic compressive strength, axial compressive strength and elasticity modulus. The quantitive comparison that between cubic compressive strength and axial compressive and the relationship between elasticity modulus and axial compressive strength are got in the same matrix.(2) The degree of crack resistant of specimens influenced by the Tex content in fiber bundles and expensive capacity of matrix are researched through axial tensile test of TRSSC sheets. On the foundation of composite material mechanics theory, an assume about the distribution model that self-stress value are deduced as a quadratic function along the thickness orientation is suggested.(3) The flexural toughness of TRSSC beams affected by matrix types and Tex content in fibre bundles are studied by bending test. The theoretic solutions of cracking load are calculated according to superposed beam theory.(4) The distribution models of self-stress value under specific matrix and textile dimensions is established and verified. It is a basis for design in actual engineering projects.