侵蚀方式对硫酸根离子在混凝土中传输的影响

对连续浸泡和干湿循环 2 种侵蚀方式下硫酸根离子在混凝土中的传输过程进行了比较研究。选取混凝土强度等级为 C40 ，采用室温下自然干燥方式，硫酸钠侵蚀溶液的浓度为 800,6 000,50 000 mg/L 。当侵蚀龄期分别达到 30,90 ，180 ，360,580 d 时，采用钻芯、分层切片、研磨提取水泥石粉末样本进行化学分析，测定不同深度处混凝土的硫酸根离子含量。结果表明：总体上看干湿循环与连续浸泡相比更具有加速硫酸根离子向混凝土内传输的作用，使同深度处硫酸根离子含量增加；浓度较低的侵蚀溶液硫酸根离子具有更易于向混凝土深处传输的趋势，使较深处硫酸根离子含量增加；浓度较高的侵蚀溶液更偏于按着由表及里破坏的方式对混凝土产生侵蚀，使高含量的硫酸根离子聚集在浅层混凝土中。

Influences of Erosion Modes on Sulfate-ion Transportation in Concrete

The erosion modes of both continuous immersion and wetting-drying cycles were selected to study their effects on the transportation process of sulfate-ion in concrete.The strength grade of concrete was C40,the natural dry mode in room temperature was used.The concentration of sodium sulfate solutions were 800 mg/L,6000 mg/L and 50 000 mg/L respectively.With the erosion ages of 30 d,90 d,180 d,360 d and 580 d,the samples were made by drilling core,cutting into slices and grinding into powder,and tested by th...