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在相同配合比下的混凝土试件中加入4种不同含量的引气剂,用来模拟混凝土试件的初始缺陷程度,并在WAW-E2000万能试验机上进行混凝土试件的轴向拉伸试验,测出了混凝土在拉伸试验过程中的应力-应变全曲线,研究了不同含量的引气剂对混凝土的抗拉强度、变形特性与损伤特性的影响.试验结果表明:随着引气剂含量的增大,混凝土的应力-应变曲线逐渐变平缓,混凝土内的初始损伤程度相应增加,且抗拉强度随之降低,而峰值应变基本保持不变.
Four different kinds of air entraining agents were added to the concrete specimens with the same mixing ratio to simulate the initial defects of the concrete specimens. The axial tensile test of the concrete specimens was carried out on a WAW-E2000 universal testing machine, The full stress-strain curve of concrete during the tensile test was measured and the influence of different content of air-entraining agent on the tensile strength, deformation and damage characteristics of concrete was studied.The experimental results show that with the increase of air-entraining agent , The stress-strain curve of concrete gradually flattens, the initial damage degree in concrete increases correspondingly, and the tensile strength decreases, while the peak strain remains basically unchanged.