The influence of equal amplitude high stress repeated loading on the mechanical and deformation characteristics of rubber concrete

摘要

The reuse of waste rubber in concrete has become one of the focuses of environmentalists and researchers in recent years. Rubber concrete pavement is often deformed and damaged by the repeated loading of vehicles. In this paper, a series of experiments are carried out on the deformation of rubber concrete (RC) during equal amplitude repeated loading. It is discussed that the effect of rubber particle size (0.85 mm, 1-3 mm and 3-6 mm) and content (0%, 5%, 10%, 15% and 20%) of RC on the uniaxial mechanical properties and the total strain, elastic strain and plastic strain during repeated loading. The results show that with the increase of rubber content and particle size, the compressive strength and elastic modulus of concrete decrease. After 50 times of repeated loading, the decrease of compressive strength of RC is generally higher than that of NC, but The decrease in elastic modulus is lower than that of NC, which shows that the addition of rubber can slow down the loss of elastic modulus, and the decrease of elastic modulus first decreases and then increases with the increase of particle size and content. During repeated loading, the curves of total strain, elastic strain and plastic strain of RC are significantly higher than those of NC, which indicates that RC has larger deformation and elasticity, but the relative strain range is smaller than NC, showing better stability. The mechanical properties of each group of concrete are evaluated by the analysis of efficiency coefficient, the scoring order of each group is RCA-1 RCA-2 RCB-2 RCA-4 RC A-3 RCC-2 NC. The results show that the best content of rubber is 5%, and the best particle size is 0.85 mm. (C) 2020 Elsevier Ltd. All rights reserved.