In this study, acoustic emission (AE) was used to monitor the whole process of tensile and fracture of the self-compacting rubber concrete (SCRC) under four-point bending. The AE activities of SCRC during the stretching and fracture process were analyzed by statistical methods to correlate the process of crack propagation with changes in mechanical properties. And by comparing the tensile and fracture properties, the change patterns of crack mode, the cumulative events and energy of AE in the bending process of SCRC with different rubber particles content, the influence of the incorporated rubber particles on the propagation of microcracks, and the macroscopic fracture mechanism were analyzed. Studies showed that with the incorporation of rubber particles, the ductility of the concrete before and after cracking was improved. Due to the weak bonding surface between the rubber particles and the matrix, the microcracks began to propagate at low-stress levels and developed steadily throughout the stretching process. As the rubber content increased, more rubber components participated in the tensile and fracture process. Because of the elastic stretching of rubber particles, the tensile deformation capacity and fracture properties of the concrete have been improved. And in the whole process of tensile and fracture, the cracking of the weak cemented surface of the matrix and the pulling of the rubber particles were more likely to cause shear mode cracks.

中文翻译：

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基于声发射的自密实橡胶混凝土裂缝扩展及断裂过程定量统计分析

在这项研究中，声发射（AE）被用来监测自密实橡胶混凝土（SCRC）在四点弯曲作用下的拉伸和断裂全过程。通过统计方法分析了 SCRC 在拉伸和断裂过程中的 AE 活动，以将裂纹扩展过程与机械性能的变化联系起来。并通过比较不同橡胶颗粒含量的 SCRC 弯曲过程中 AE 的拉伸和断裂性能、裂纹模式的变化模式、AE 的累积事件和能量、掺入的橡胶颗粒对微裂纹扩展的影响，以及宏观断裂机理进行了分析。研究表明，随着橡胶颗粒的掺入，混凝土开裂前后的延性得到改善。由于橡胶颗粒与基体之间的弱结合表面，微裂纹开始在低应力水平下传播，并在整个拉伸过程中稳定发展。随着橡胶含量的增加，更多的橡胶组分参与了拉伸和断裂过程。由于橡胶颗粒的弹性拉伸，提高了混凝土的拉伸变形能力和断裂性能。并且在整个拉伸和断裂过程中，基体弱胶结面的开裂和橡胶颗粒的拉动更容易产生剪切模式裂纹。更多的橡胶组分参与了拉伸和断裂过程。由于橡胶颗粒的弹性拉伸，提高了混凝土的拉伸变形能力和断裂性能。并且在整个拉伸和断裂过程中，基体弱胶结面的开裂和橡胶颗粒的拉动更容易产生剪切模式裂纹。更多的橡胶组分参与了拉伸和断裂过程。由于橡胶颗粒的弹性拉伸，提高了混凝土的拉伸变形能力和断裂性能。并且在整个拉伸和断裂过程中，基体弱胶结面的开裂和橡胶颗粒的拉动更容易引起剪切模式裂纹。