Damage and failure of rubberized self-compacting concrete (RSCC) under uniaxial tension are investigated by acoustic emission (AE) and digital image correlation (DIC) techniques. Four RSCC mixtures containing fine rubber particles with 0%, 5%, 10%, and 15% volume fractions are tested. The effect of rubber content on the macroscopic mechanical behavior, the AE parameters, the strain fields, and the damage developments are analyzed. It is demonstrated that the combined use of AE parameters and DIC strain maps provides an accurate estimation of different stages of damage evolution and that the crack propagation measured by DIC correlates strongly with all AE parameters. Modes of cracking are determined by analyses of average frequency (AF) versus rise time–amplitude (RA) values to demonstrate an additional feature of AE, which can be used for explanations of different behaviors under different loading conditions. It is shown that the substitution of fine aggregates with fine rubber particles leads to a reduction of stiffness, strength, and fracture toughness when the material experiences uniaxial tension. This has to be considered in the design of structures with RSCC.

中文翻译：

---

声发射和数字图像关联研究橡胶自密实混凝土拉伸断裂

通过声发射 (AE) 和数字图像相关 (DIC) 技术研究了单轴拉伸下橡胶自密实混凝土 (RSCC) 的损坏和破坏。测试了四种含有体积分数为 0%、5%、10% 和 15% 的细橡胶颗粒的 RSCC 混合物。分析了橡胶含量对宏观力学行为、AE 参数、应变场和损伤发展的影响。结果表明，AE 参数和 DIC 应变图的结合使用提供了对损伤演化不同阶段的准确估计，并且 DIC 测量的裂纹扩展与所有 AE 参数密切相关。开裂模式是通过分析平均频率 (AF) 与上升时间-幅度 (RA) 值来确定的，以证明 AE 的附加特征，可用于解释不同负载条件下的不同行为。结果表明，当材料经受单轴拉伸时，用细橡胶颗粒代替细骨料会导致刚度、强度和断裂韧性降低。在设计具有 RSCC 的结构时必须考虑到这一点。