用AE技术研究集料尺寸对混凝土断裂性能的影响

Study of the Influence of Aggregate Size on Fracture Properties of Concrete by Acoustic Emission Technique

分别利用声发射（ＡＥ） 及其三维定位技术研究了最大集料尺寸（ｄｍａｘ）对混凝土断裂性能和裂缝尖端断裂过程区的影响．实验结果表明，随ｄｍａｘ 增大，混凝土断裂能增大，且声发射事件数与断裂能（ ＧＦ） 也有着很好的对应关系．集料粒径越大，对裂缝扩展的偏转作用越显著，形成的断裂过程区越大．

Influence of aggregate size on fracture properties of concrete was studied by means of AE technique,and three dimensional acoustic emisssion technique was applied to observe the phase of the fracture process of concrete.The results show that the fracture energy increases with increasing the maximum aggregate size.Moreover,there is a good corresponding relationship between AE counts and fracture energy.The larger the coarse aggregate size,the more remarkable deflection in the development of crack,and the wider fracture process zone is created.