盐湖卤水侵蚀混凝土孔结构分析

Analysis of pore structure of concrete under the salt lake brine erosion

通过分析混凝土在(干湿循环+盐湖卤水侵蚀)共同作用下的孔结构特征变化,研究了侵蚀过程中混凝土孔结构的分布规律及其劣化发展过程。结果表明:侵蚀初期主要是混凝土中小孔隙和中孔隙数量增加、弦长扩展,含气量较低且主要由大孔隙和超大孔隙决定;侵蚀中后期孔结构分布发生较大变化,不同弦长孔隙数量均快速增加,孔隙连通及孔径增长使混凝土损伤劣化加快。

Under the combined action of wetting-drying cycles and salt lake brine erosion,the change of pore structure characteristics of concrete are analyzed,the distribution law of pore structure of concrete and its deterioration process are studied.The results showed that at the beginning of erosion,the number of small and medium pores of concrete is mainly increasing,the chord length is extending,the air content that is mainly decided by the macro and super pores is low.Erosion later,pore structure distribution changed greatly,the number of different chord length pores are increasing rapidly.Pore connectivity and aperture growth promote the damage and deterioration of the concrete.