普通混凝土和橡胶混凝土弯曲损伤过程的声发射研究

研究了不同强度的普通混凝土及橡胶混凝土在静态弯曲加载条件下的抗弯性能及其破坏过程的声发射性能.力学性能测试结果表明，橡胶混凝土的抗折强度高于同等抗压强度的普通混凝土.采用声发射系统对加载全程进行了信号采集.结果表明，随着普通混凝土强度的提高，弯曲过程中的声发射信号的活度减小，而信号的强度增大.橡胶混凝土的声发射信号的活度和强度均小于普通混凝土.对声发射信号的强度和活度的分析表明，在相同加载条件下，橡胶混凝土的损伤程度比相同抗压强度的普通混凝土小，这与两种混凝土反映出的宏观性能的差异是一致的.应用声发射信号定位研究了混凝土的损伤区域，定位分析结果与实际观察结果一致.

Investigation of the Damage Process of Ordinary Concrete and Rubberized Concrete Under Bending Load by AE

The bending performances of different ordinary concretes and rubberized concrete by AE technology were investigated. Acoustic emission signals were also collected to analyze the damage process under bending test. The rupturing strength of rubberized concrete was found to be greater than that of the ordinary concrete with the same compressive strength. The AE result shows that the activity of AE signals is weaker for higher strength ordinary concrete, but the intensity is higher. It is also found that both the activity and the intensity of rubberized concrete are lower than the ordinary concrete, which demonstrates that the damage degree in rubberized concrete is lighter than in the ordinary concrete under static bending load, and this may account for the higher bending strength of rubberized concrete. The results of AE location analysis corresponds well with the actual damage area observed during the test.