水泥稳定砖与混凝土再生集料混合料的疲劳性能

Fatigue Performance of Cement Stabilized Recycled Brick and Concrete Aggregate（RBCA） Mixtures

关键词:  道路工程  砖与混凝土再生集料  疲劳特性  弯拉强度

Key words:  road engineering  recycled brick and concrete aggregate(RBCA)  fatigue property  flexural tensile strength

摘要:

研究了水泥稳定砖与混凝土再生集料（RBCA）混合料的无侧限抗压强度、劈裂强度与抗压回弹模量等基本物理力学性能，并开展了水泥稳定RBCA混合料的四点弯曲疲劳试验；基于Weibull分布确定了混合料的疲劳寿命预估模型，分析了RBCA掺量对混合料疲劳性能的影响.结果表明：随着RBCA掺量的增加，水泥稳定RBCA混合料的无侧限抗压强度、劈裂强度与抗压回弹模量均先增大后减小，弯拉强度也具有类似规律；相同级配与水泥剂量下，混合料的疲劳寿命随着RBCA掺量的增加而增大，且RBCA掺量较小时其混合料疲劳寿命增幅较大，后续增幅变小；加入RBCA可提高水泥稳定碎石混合料的抗疲劳性能.

Abstract:

The basic physical and mechanical properties such as unconfined compressive strength, splitting strength and compressive resilience modulus of cement stabilized recycled brick and concrete aggregate(RBCA) mixtures were studied. Four point flexural beam fatigue test on RBCA mixtures with different RBCA contents was conducted. A prediction model of fatigue life of RBCA mixtures based on Weibull distribution was determined and the influence on fatigue performance of mixtures with different RBCA contents was analyzed. The results show that all the unconfined compressive strength, splitting strength and compressive resilience modulus of cement stabilized RBCA mixtures increase at first and then decrease with increasing RBCA content, and the flexural tensile strength also has a similar rule. The fatigue life of the mixture for the same gradation and cement content increases with increasing RBCA content. The fatigue life of RBCA mixtures is increased greatly when the RBCA content is small. The addition of RBCA can improve the fatigue properties of cement stabilized macadam mixture.