Papers by Author: Jian Dong Wang

Abstract: This study investigates the compressive strength, flexural strength and flexural modulus of the short-chopped igneous fiber reinforced concrete, short-chopped carbon fiber reinforced concrete and plain concrete. Experimental results show that both short-chopped igneous fiber and carbon fiber can improve the compressive strength and flexural behavior of the concrete significantly, and the reinforcing effectiveness of igneous fiber is better that of carbon fiber.

Abstract: The permeability of chloride ion in concrete can be studied using the accelerated aging method in a short period, but the influence of loading characteristic on chloride ion permeability and diffusion coefficients is not considered generally. Three RC beam (120 mm×240 mm×2400 mm) specimens with different flexural loading state are exposed in an artificial corrosion container filled with salt-fog of 5.0 % sodium chloride for 40 days, the chloride ion concentration in different depths of compressive and tensile region are measured, diffusion coefficients of different region concrete are fitted on the basis of Fick’s second law, the effect of flexural loading on chloride ion concentration and diffusion coefficients of concrete are analyzed. The results show that the effect of the flexural load influences permeability of chloride ion and diffusion coefficients of concrete, content of chloride and diffusion coefficients of concrete are controlled by loading level, and the bending load is one of the important factors that can not be ignored in the study of concrete durability.