酸雨环境下约束混凝土本构关系试验

Experiment on the Constitutive Relation of Confined Concrete under Acid Rain Environment Erosion

摘要:

为研究酸雨环境下箍筋约束混凝土(以下简称约束混凝土)的应力应变关系，配置不同浓度的酸液，对配箍特征值分别为0195，0125的50个150mm×150mm×450mm钢筋混凝土棱柱体试件进行酸液周期浸泡侵蚀及轴压加载试验，研究了侵蚀程度、配箍特征值对混凝土峰值应力及峰值应变等力学性能的影响，得到约束混凝土的应力应变全曲线.结果表明：酸雨环境下，约束混凝土的受压应力应变全曲线呈扁平状；在配箍特征值相同的情况下，随着酸液浓度的增加，混凝土峰值应力呈线性降低，而峰值应变相应增大；在酸液浓度相同的情况下，混凝土峰值应力降低程度及峰值应变增大程度均随混凝土强度的增大而减小.

Abstract:

In order to study the stress strain relationship of stirrups confined concrete under acid rain environment erosion, the different concentrations of acid liquor was prepared to simulate the acid rain environment. 50 reinforced concrete specimens of 150mm×150mm× 450mm with stirrup characteristic value 0195 and 0125 were soaked by acid solution, axial compression loading experiment was carried out. The influence of erosion degree and stirrup characteristic value on the mechanical properties such as peak stress and peak strain of concrete were investigated and the stress strain curve of confined concrete was obtained. The experimental results show that the compressive stress strain curve of confined concrete is flat, in the case of the same stirrup characteristic value, with the increase of acid concentration, the peak stress of concrete decreases linearly, and peak strain of concrete increases. Under the same solution concentration, the decreased degree of peak stress and the increased degree of peak strain decreased with the increase of concrete strength level.