Abstract
An experimental study on the flexural fatigue behaviors of recycled concrete (RC) and silicon carbide recycled concrete (SiCRC) was conducted. The immersion time was 0 d, 30 d, 60 d, and 90 d in 5% NaCl solution for these two kinds of recycled concrete specimens, respectively, and then, four-point flexural fatigue tests were performed by MTS fatigue testing machine. The fatigue life for varying stress levels ranging from 0.9 to 0.6 was obtained. The fatigue life was given considering the failure probability according to the fatigue life and stress level of the specimen via the logarithmic normal distribution and Weibull distribution, respectively. The relationship between fatigue life and failure probability was also obtained. The fatigue life with failure probability of 1% and 50% was further predicted. The results showed that the fatigue life of RC and SiCRC increased in corrosive environments. The fatigue life of SiCRC is higher than that of RC, and the incorporation of SiCRC can improve the fatigue life of recycled concrete.
Highlights
With the development of the city, construction waste is growing
Ramesh et al [11] found that the split-tensile strength, the compressive strength, and the elastic modulus of recycled concrete with substitution rate of 30%, 50%, 70%, and 100% were lower than that of natural concrete, and the splitting tensile strength can be increased by 0.7% after incorporation of steel fiber
Rahal [13] found that the compressive strength and indirect shear strength of 28-day cube and cylinder of recycled aggregate concrete were 90% of natural aggregate concrete under the same mix proportions
Summary
With the development of the city, construction waste is growing. It is conservatively estimated that, over the 10 years, China will produce more than 1.5 billion tons of construction waste per year, reaching 7.3 billion tons in 2030 [1]. The construction waste are mainly brick and concrete, which are treated as recycled aggregate and prepared as inorganic mixture for road pavement base. Ramesh et al [11] found that the split-tensile strength, the compressive strength, and the elastic modulus of recycled concrete with substitution rate of 30%, 50%, 70%, and 100% were lower than that of natural concrete, and the splitting tensile strength can be increased by 0.7% after incorporation of steel fiber. The flexural fatigue performance of common recycled concrete and silicon carbide recycled concrete in corrosion environment will be studied by experiments in this paper in order to obtain useful conclusions
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