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通过制配水泥胶砂试件进行硫酸盐侵蚀试验,研究了水灰比、养护龄期、侵蚀溶液浓度、侵蚀龄期等对硫铝酸盐水泥混凝土抗硫酸盐侵蚀能力的影响;并采用宏观观测和扫描电镜(SEM)、能谱(EDS)微观观测方法,分析和揭示其抗硫酸盐侵蚀机理,并与高抗硫硅酸盐水泥和普通硅酸盐水泥的抗硫酸盐侵蚀性能进行了对比。结果表明,硫铝酸盐水泥胶砂试件可以抵抗高浓度硫酸盐的侵蚀,且随着水灰比的降低、养护龄期的延长,其抗硫酸盐侵蚀能力会进一步得到提高;硫铝酸盐水泥混凝土较高的抗硫酸盐侵蚀能力,主要取决于混凝土的高密实度和化学侵蚀内因的减少。侵蚀发生在开口孔隙内,侵蚀产物是团簇状钙矾石(AFt),硫铝酸盐水泥具有显著高于高抗硫水泥抗硫酸盐侵蚀的能力。
Sulfate erosion tests on cement mortar were carried out to study the effect of water-cement ratio, curing age, concentration of erosion solution and erosion age on the sulfate resistance of sulphoaluminate cement concrete. Macroscopic Observation and scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) microscopic observation methods, analysis and revealing its anti-sulfate attack mechanism, and with the high anti-sulfur Portland cement and ordinary Portland cement sulfate corrosion resistance were Compared. The results show that the samples of sulphoaluminate cement mortar can resist the erosion of high concentration sulphate, and the resistance to sulphate attack will be further enhanced with the decrease of water-cement ratio and the prolongation of curing age. The sulphoaluminate The high salt sulfate concrete resistance to sulfate attack depends mainly on the high compactness of the concrete and the reduction in chemical attack. Erosion occurs in the open pores and the erosion product is clustered ettringite (AFt), which has a significantly higher resistance to sulphate attack than highly sulphurized cements.