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本文对混凝土在高速荷载下裂缝的扩展及其断裂性能进行了试验研究．试验结果表明：裂缝扩展的最大速度及加速度随加载速率的增加而增加；动断裂切度随裂缝扩展速率增加而增加；对应于峰值荷载的裂缝扩展量也随加载速率的增加而增加．
In this paper, the crack growth and fracture behavior of concrete under high-speed loading were studied. The experimental results show that the maximum velocity and acceleration of crack propagation increase with the increase of loading rate, the dynamic fracture rate increases with the increase of crack propagation rate, and the crack expansion corresponding to peak load also increases with the increase of loading rate.