硫酸盐浸烘腐蚀淡化海砂混凝土的试验研究

Study the corrosion of drying-wetting sulfates on washed sea sand concrete

对淡化海砂混凝土在5%Na2SO4(质量分数,下同)、5%MgSO4+3.5%NaCl两种腐蚀溶液中干湿循环的损伤过程进行研究。结果表明:Na2SO4溶液浸烘循环中,混凝土的损伤表现为动弹性模量先下降后上升最后加速下降;腐蚀溶液中Mg2+与SO24-共同作用下,混凝土的损伤表现为动弹性模量随腐蚀时间先降低,后稳定发展,即将破坏时迅速下降。

The damage process and microstructure of washed sea sand concrete, attacked by solutions of 5% Na2SO4 （by mass, same below） ,5% MgSO4 ＋ 3.5% NaC1 with method of drying-wetting cycle are studied. The resuhs show that the elastic modulus of concrete attacked by Na2 SO4 behaviors in a decreasing stage followed by improved stage finally fell rapidly. For the concrete exposed to solution composed of Mg2＋ and SO ,its relative dynamic elastic modulus decreased firstly, then kept stable, finally decreased rapidly to failure.