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The damage of concrete cube was experimentally studied. The compressive strength, splitting tensile strength and ultrasonic velocity were measured before and after loading history, respectively. Based on the continuum damage mechanics theory, the reduction of compressive strength and splitting tensile strength denote the damage of concrete. The relationship between the damage and the descent of ultrasonic velocity due to triaxial compressive loading history was investigated. According to the fitting...

The damage of concrete cube was experimentally studied. The compressive strength, splitting tensile strength and ultrasonic velocity were measured before and after loading history, respectively. Based on the continuum damage mechanics theory, the reduction of compressive strength and splitting tensile strength denote the damage of concrete. The relationship between the damage and the descent of ultrasonic velocity due to triaxial compressive loading history was investigated. According to the fitting of experimental data, the evolution equation of damage was obtained. The damage is found to be in linear dependence relationship with the descent of ultrasonic velocity. It is concluded that, being an important nondestructive detection method, supersonic inspection is convenient and applicable to estimation of damage of concrete during loading history in engineering practice.

To investigate the effect of fiber volume fraction on mechanical properties of carbon fiber cement composite,the compressive strength and split tensile strength are tested for different fiber volume fractions. The experimental results show that the compressive strength and split tensile strength have different increases as the fiber volume fraction increases. Furthermore, the maximum compressive strength is reached when the fiber volume...

To investigate the effect of fiber volume fraction on mechanical properties of carbon fiber cement composite,the compressive strength and split tensile strength are tested for different fiber volume fractions. The experimental results show that the compressive strength and split tensile strength have different increases as the fiber volume fraction increases. Furthermore, the maximum compressive strength is reached when the fiber volume fraction is e-qual to 0. 6%,the maximum split tensile strength is reached when the fiber volume fraction is equal to 0. 8%.

In the method of testing flexural toughness of ASTM,the deflection,compressive strength and splitting tensile strength were tested and the index of flexural toughness was figured up in order to research the effect of steel fiber content on steel fiber concrete's flexural toughness.From brittleness failure to ductility failure,the failure form of concrete was turned because of steel fiber,and the strength of concrete damaged could be saved in some level.The flexural toughness indexes increased with...

In the method of testing flexural toughness of ASTM,the deflection,compressive strength and splitting tensile strength were tested and the index of flexural toughness was figured up in order to research the effect of steel fiber content on steel fiber concrete's flexural toughness.From brittleness failure to ductility failure,the failure form of concrete was turned because of steel fiber,and the strength of concrete damaged could be saved in some level.The flexural toughness indexes increased with fiber content increases in some extent.While the content of steel fiber in concrete got up to 90?kg/m~3,the toughness indexes were close to the ideal elasticity- plasticity materials.The splitting tensile strength would alter hardly ever within the content of steel fiber from 30?kg/m~3 to 90?kg/m~3.