不同环境中矿物掺合料混凝土抗硫酸盐侵蚀性能的研究进展

硫酸盐侵蚀是混凝土耐久性研究的热点之一。矿物掺合料的掺人改变混凝土内部的组成，细化了混凝土的孔结构，对混凝土抗硫酸盐侵蚀起着重要作用。掺合料的化学组成、细度、掺量等对混凝土抗硫酸盐侵蚀均有很大的影响。外界腐蚀环境的不同，矿物掺合料混凝土抗硫酸盐侵蚀的性能也有显著的差别。大量的研究表明，在连续浸泡的硫酸盐溶液中，矿物掺合料只要掺量适当能够提高混凝土抗硫酸盐侵蚀的能力。在干湿循环与硫酸盐溶液共同作用下，矿物掺合料混凝土抗硫酸盐侵蚀的能力有所争议，有些研究表明矿物掺合料能够提高干湿循环条件下混凝土抗硫酸盐侵蚀的能力；然而有些研究结果却呈现相反的结论，这需要进一步探索。

Research Progress on Sulfate Resistance of Concrete with Mineral Admixture in Different Environments

Sulfate attack is one of the hot topics in the study of concrete durability. The incorporation of mineral admix- tures changes concrete composition and refines pore structure of concrete, which plays an important role on the concrete re- sistance to sulfate attack. Chemical composition, fineness, dosage, etc. of admixture have great influence on concrete re- sistance to sulfate attack. When exterual corrosion environment is different, the resistance to sulfate attack of mineral ad- mixture concrete also has significant difference. Abundant studies manifest that mineral admixtures can significantly im- prove the ability of resistance to sulfate attack of concrete in continuous immersion of sulfate solution as long as the content is appropriate. In dry-wet circulation and sulfate solution condition, it is controversial that mineral admixtures of concrete resist to sulfate attack. Some studies have shown that mineral admixtures can improve the ability of resistance to sulfate attack of concrete, some studies, however, hold the opposite conclusion, which need further study.