Effect of elevated temperature and cooling regimes on mechanical and durability properties of concrete containing waste rubber fiber

Accumulation of the waste tire is a major problem as degradation of these tires is extensively difficult. The results of experimental studies available for rubberized concrete provide a strong recommendation for the use of this waste where strength is not a major concern. The effect of partial replacement of fine aggregate by waste rubber fiber on the properties of concrete subjected to elevated temperature has been evaluated in this paper. A systematic experimental investigation has been carried out to evaluate the effect of elevated temperature on compressive strength, mass loss, static modulus of elasticity, dynamic modulus of elasticity, water permeability and chloride-ion permeability of control mix (no replacement of fine aggregate by rubber fiber) and waste rubber fiber concrete. Two types of cooling, normal cooling and fast cooling have been considered for the effect on compressive strength. Six levels of temperature with three exposure durations have been considered in this study for all the specimens. Microstructure analysis of waste rubber fiber concrete has also been carried out to investigate the effect of elevated temperature on crack pattern and bonding of rubber fiber and cement matrix.