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旨在研究混凝土在应力和碳化共同作用下的损伤机理。试验采用无应力、拉应力、压应力3种试件进行了快速碳化试验。测量了受力在0,0.15,0.3,0.45,0.6,0.75倍拉/压设计强度下的混凝土的碳化深度。实验结果表明,拉、压应力分别加快和减缓了混凝土碳化速率,且应力越大,对混凝土碳化的影响也越大。说明应力对混凝土碳化耐久性的影响是显著的。与此同时,在考虑应力影响系数的情况下,结合使用条件建立了大气环境中应力状态下混凝土碳化深度的预测模型。通过计算值和实验值的计算对比,证明了该模型的有效性。
The purpose is to study the damage mechanism of concrete under the combined action of stress and carbonization. The test uses no stress, tensile stress, compressive stress of three kinds of specimens for rapid carbonation test. The depth of carbonation of the concrete under 0,0.15,0.3,0.45,0.6,0.75 times the tensile strength was measured. The experimental results show that the tensile and compressive stress speed up and slow down the carbonization rate of concrete, respectively. The bigger the stress is, the greater the impact on concrete carbonation. The effect of stress on the carbonation durability of concrete is significant. At the same time, considering the influence coefficient of stress, the prediction model of carbonation depth of concrete in stress state under atmospheric condition was established. By comparing the calculated value with the experimental value, the validity of the model is proved.