Experimental and analytical study on uniaxial compressive fatigue behavior of self-compacting rubber lightweight aggregate concrete

Abstract

In view of the excellent deformation capacity and energy absorption capacity, rubber particles had potential possibility to improve the fatigue properties of lightweight aggregate concrete (LC). However, the fatigue properties of LC containing rubber particles were not adequately understood. This paper focused on the effect of rubber particles on the uniaxial compressive fatigue properties of self-compacting rubber lightweight aggregate concrete (SCRLC). The results of uniaxial compressive fatigue tests indicated that fatigue life and fatigue strain of SCRLC added generally with increase of rubber particles substitution percentage, fatigue strain of SCRLC also raised with number of cycles increased. Analyses results indicated that the fatigue life of SCRLC conformed to two-parameter Weibull distribution. Based on the experimental results, fatigue equation of SCRLC was established by double logarithmic fatigue equation. From the curves of lgS-lgNf of SCRLC, it could be discovered that increasing of rubber particles substitution percentage in SCRLC resulted in a decrease of fatigue limit strength, but the stress level at fatigue life of 2 × 106 increased firstly and then decreased. The highest stress level of SCRLC would be obtained as rubber particles substitution percentage was 30%. By comprehensive consideration, under the same strength level, the fatigue properties of SCRLC was better than that of LC.