混凝土骨料对承压试样裂纹扩展区的影响

The effect of concrete aggregate on the crack propagation of confined sample

混凝土材料的结构尺寸效应是将实验室测量结果外推应用于预测实际工程结构损伤累积破坏的一个关键问题。本文对具有不同骨料粒径的混凝土试样进行承压实验,观测试样微裂纹的演化特点,对混凝土材料的骨料对承压试样的裂纹扩展区的影响规律进行探讨。实验研究结果说明,骨料粒径大时试样表面产生宽而少的裂缝,骨料粒径变小时产生细而多的小裂缝。

The structure of concrete material size effect is a key issue to extrapolate laboratory measurements applied to predict the actual cumulative damage of engineering structures damaged. This project required concrete with different size of aggregate to confined experiment, observing the micro - cracks＇ evolution characteristics of the sample. The main task is to discuss the impact of the laws about the crack propagation of the confined aggregate materials of concrete specimens. Experimental results shows that the aggregate sample size is large and less wide surface cracks, aggregate size becomes smaller, thin and produce more small cracks.