橡胶混凝土断裂性能试验研究
Experimental study on the fracture characteristics of crumb rubber concrete

开展了橡胶混凝土三点弯曲梁断裂试验，获得了不同试件尺寸和橡胶掺量下的裂缝断裂全过程曲线，对橡胶混凝土断裂能GF及裂缝扩展K-R阻力曲线进行研究。基于数字图像相关方法，获得了橡胶混凝土试件垂直于裂缝扩展方向的全场位移和应变信息，对裂缝扩展的损伤断裂演化过程进行研究。结果表明：随试件尺寸增加和橡胶掺量提高，断裂能均呈现出上升趋势；K-R阻力曲线随试件尺寸变化表现出明显尺寸效应，橡胶掺量在0%~14%设计范围内时，K-R阻力曲线与橡胶掺量关。
Based on the three-point bending beam fracture tests on the crumb rubber concrete with different specimen geometries and rubber volumes, the experimental curve of the whole fracture crack process was obtained, and the fracture energy and K-R resistance curve were studied. Through the digital image correlation method, the whole field displacement and strain distribution perpendicular to the direction of crack propagation were determined,from which the crack propagation and evolution process of fracture and damage can thus be examined. The results indicate that the fracture energy displays an increasing tendency with specimen geometry and rubber volume. The K-R resistance curve reveals the size effect by change of specimen geometries and shows no indicative relationship with 0%~14% rubber volume which was designed in this study.