地质聚合物砂浆的性能及工程应用研究进展

Research Status and Development Trend of Geopolymer Mortar Properties

地质聚合物作为一类新型绿色无机胶凝材料,具有早强快硬、耐腐蚀性好、工业固体废弃物资源利用率高以及生态环保等显著优势,被视为是传统水泥基胶凝材料的理想替代品。为明确地质聚合物砂浆的各项物理力学性能和加固既有混凝土结构效果,就近年国内外学者对地质聚合物砂浆的研究,对地质聚合物砂浆力学性能、耐高温性、耐腐蚀性以及加固既有混凝土结构效果等方面进行了综述,并对地质聚合物砂浆未来发展趋势进行了概述。结论表明,地质聚合物砂浆的物理性能和结构形态受原材料Si/Al比、碱激发模数、胶砂比以及养护环境等因素不同程度的影响,加入天然纤维、矿物添加剂或减水剂等可改善地质聚合物砂浆的力学性能和工作性能。此外,地质聚合物砂浆和既有混凝土界面具有良好的粘结性能,能够有效修复加固既有混凝土结构。

Geopolymer,as a new type of green inorganic cementitious material,is equipped with significant advantages such as early strength and fast hardening,good corrosion resistance,high utilization of industrial solid waste resources and ecological environmental protec‐tion,so it is regarded as an ideal substitute for traditional cement-based cementitious materials.In order to clarify the various physical and mechanical properties of geopolymer mortar and the effect of reinforcing existing concrete structures,reviews the research on geopolymer mor‐tar by scholars at home and abroad in recent years,and provides an overview of the mechanical properties,high temperature resistance,cor‐rosion resistance and the effect of reinforcing existing concrete structures of geopolymer mortar,as well as the future development trend of geopolymer mortar.It is concluded that the physical properties and structural morphology of geopolymer mortar are affected to varying de‐grees by the Si/Al ratio of raw materials,alkali activator modulus,cement-sand ratio and the maintenance environment,and that the addi‐tion of natural fibers,mineral additives or water-reducing agents can improve the mechanical and workability properties of geopolymer mor‐tar.In addition,the geopolymer mortar and the existing concrete interface have good bonding properties,which can effectively repair and strengthen the existing concrete structure.