基于酸雨和碳化耦合作用的混凝土耐蚀性能分析

Analysis of concrete corrosion resistant performance based on the coupled action of acid rain and carbonization

通过配合比设计优化,研究不同矿物掺合料品种和掺量对混凝土性能的影响,并对大量试验数据进行考查,分析混凝土在酸雨和碳化耦合条件下的侵蚀规律与中性化规律。结果表明:在酸雨和碳化侵蚀作用下,混凝土强度均有所降低,降低最大值达27%,而且中性化深度均随龄期增加而增大。对于不同的侵蚀模式,其影响规律为:S模式<ST模式<TS模式<T模式。在受侵蚀试件内部,pH值中间大,表面小,同一深度其pH值随侵蚀周期的增加而逐渐减小。

With environment deterioration,the harm of acid rain on the durability of concrete has been paid more and more attention.By optimizing of mix design,this paper researched influence of the variety and content of mineral admixtures on concrete properties,and by variance analysis and regression of extensive quantity of experimental data,the carbon and corrosion law of concrete in acid rain and carbon coupling conditions was studied.The results show that the concrete strength decreases when the concrete is eroded in coupling conditions of acid rain and carbon corrosion,while the depth of neutralization increases with age.For different erosion pattern,the influence law is： S modeST modeTS modeT mode.Within the eroded specimen,pH value was high in the middle,while it was low on the surface,and the pH value of the same depth decreased when the erosion cycle increased.