地质聚合物的土木工程耐久性能的研究进展

Recent Development of Research on Durability of Geopolymer for Civil Structural Applications

地质聚合物是由硅铝酸盐材料通过碱激发形成,具有网络结构和无定形性质的胶凝材料。由于地质聚合物具有优于普通硅酸盐水泥的力学性能,并且制备过程中CO_2排放量较少等优点,被认为是硅酸盐水泥的良好替代品。尽管相当部分的研究者认为地聚物的耐久性也要好于普通硅酸盐水泥,但其他研究者对此持怀疑态度并认为很多方面还需进一步的研究。本文回顾了近几年有关地聚物耐久性研究的现状和进展,总结和讨论了地聚物的吸水性、碳化、硫酸盐侵蚀、酸腐蚀、碱-集料反应和氯离子渗透等耐久性能及其作用机理的研究成果,并提出了现有研究存在的主要问题。

Geopolymer is a kind of cementitious materials with network structures and amorphous phase, which can be synthesized by activating aluminosilicate through alkaline solution. Due to the mechanical properties of geopolymer are better than those of ordinary portland cement, and the C0 2 emissions in production process are less than the latter, the geopolymer is regarded as a promising substitute for ordinary portland cement. Many researchers believe that the durability of geopolymer for civil structural applications is better than that of OPC, however some other researchers remain sceptical of that and consider the durability of geopolymer needs further studies. Based on most of the available literatures, the present paper reviews the researches on durability of geopolymer in civil engineering application, including the gas permeability and water absorption, the carbonization, the sulfate corrosion, the acid corrosion, the alkali aggregate reaction, and the chloride ingress. In addition, the mechanisms of the material resisting the attacks were summarized, and the problems in the current researches were discussed.