In the multi-purpose environment simulation system, cement mortars that had dipped in Na_2SO_4 solution of different concentration carry on mass losing, volumetric deformation tests and SEM analysis under invariable temperature and variational humidity. 在多功能环境模拟系统中,对经不同浓度Na2SO4溶液浸泡后的砂浆试件进行了恒温变湿条件下的质量损失、线性收缩测试及SEM分析。