含气量与水胶比对混凝土抗盐冻性能的影响

Effects of water-binderratio and gas content on the frost-salt resistant ability of concrete

研究了水胶比不同而含气量相同与水胶比相同而含气量不同的情况下,混凝土抗盐冻破坏的能力。试验采用单面冻法,用动弹性模量、氯离子渗透系数、表面电阻率和界面过渡区扫描等方法进行评价。结果表明:混凝土经过盐冻后弹性模量降低较小,表面质量剥蚀量变化较大,且剥蚀量随着含气量的增大而减小;随着水胶比的降低剥蚀量减少。盐冻后氯离子渗透系数随着盐冻次数的增下先降低后升高,3%的盐溶液浓度对混凝土的破坏能力较大,由界面过渡期也可以看出3%的盐溶液浓度界面过渡区较宽。

The effects of water-binder ratio and gas content on the ability of damage resistant to the freeze-thaw cycles of concrete were studied.In the antifreeze experiment,the single-sided freeze-thaw method was used,and the dynamic elastic modulus,chloride ion permeability coefficient,surface resistivity and interfacial transition zone scanning were evaluated.The experimental results show that the elastic modulus of concrete decreases less after salt frost,the denudation of surface quality changes greatly,while the denudation decreases with the increase of gas content,and the denudation decreases with the decrease of water-binder ratio.After salt frost,the chloride ion permeability coefficient decreased first and then increased with the increase of the number of salt frost.The destructive capacity of 3%salt solution to concrete was grate.Fromthe interfacial transitional period,it can be seen that the salt solution concentration interfacial transition area of 3%is wider.