复合盐协同作用对水泥胶砂性能劣化的影响分析

Analysis of the Effect of Complex Salt Synergy on the Deterioration of Cementitious Sand Properties

硫酸盐和氯盐是我国盐渍土主要含盐成分,其地区公路经常发生盐胀、腐蚀、溶蚀等病害。掌握复合盐对水泥胶砂的侵蚀作用机理和影响规律对盐渍土地区工程建设有重要意义。采用双因素等重复性试验方差分析方法。选取硫酸盐的浓度和氯盐的浓度两个主要参数,研究两种盐浓度变化对试验结果的影响,以及两种盐之间交互作用对水泥胶砂力学性能的影响。研究表明,硫酸盐、氯盐以及两种盐交互作用对水泥胶砂的抗折和抗压强度均能产生显著性影响。在盐侵蚀环境中,氯盐对水泥胶砂前期抗折强度影响较大,硫酸盐对水泥胶砂后期抗折强度影响较大。

Sulphate and chloride salts are the main salt-bearing components of saline soils in China,and salt swelling,erosion and dissolution are often found on roads in their areas.It is important to grasp the mechanism of erosion effect of compound salt on cement mortar and the influence law for the engineering construction in saline soil areas.In this paper,a two-factor equal repetition test ANOVA method is used.The two main parameters of sulphate concentration and chloride salt concentration were selected to study the effect of the variation of the two salt concentrations on the test results,and the effect of the interaction between the two salts on the mechanical properties of cement mortar.It was shown that sulphate,chloride salt and the interaction between the two salts could have a significant effect on the flexural and compressive strength of the cement mortar.In a salt attack environment,the chloride salt has a greater effect on the Upfront strength of the cement mortar and the sulphate has a greater effect on the late intensity of the cementitious sand.