单轴压缩下不同含水率水泥混凝土的能量演化特征

Energy Evolution Characteristic on Cement Concrete with Different Water Content under Unaxial Compression

能量演化贯穿于混凝土破坏的全过程。为探究含水率对受载混凝土能量演化特征的影响规律,对泡水0 h、6 h和24 h的C45水泥混凝土试样进行了单轴加载试验。结果表明:混凝土含水率越高,混凝土的刚度、相对抵抗变形和破坏的能力逐步下降;不同含水率混凝土的弹性能密度随应力比率呈幂指数增加;混凝土含水率越高,其储能极限越小,破裂所需要的耗散能越少;混凝土的能量分配形式相似,且混凝土含水率对能量分配影响不明显。在机场道面工程设计时,应加强排水设计,减轻含水率对其劣化的影响,延长道面使用寿命。

Energy varies during the whole process of concrete deformation and failure. In order to investigate the effect of water content on rock energy variation, axial loading tests were conducted for C45 cement concrete samples which were soaked in water for 0 h, 6 h and 24 h. The results show that with the increase of the water content of concrete, the stiffness, relative to the ability of resist deformation and damage of concrete decrease gradually. The elastic energy density of concrete with different water content increases exponentially with increasing of the stress ratio. The higher the water content, the smaller the energy storage limit, and the less dissipated energy required for fracture. The energy distribution of concrete is similar, and the influence of water content on energy distribution is not obvious. In the design of airport pavement engineering, the design of drainage should be strengthened to reduce the influence of water content on deterioration and prolong the service life of pavement.