地聚合物耐高温性能研究进展探析

Researchprogress on high temperature resistance of geopolymers

地质聚合物是一种由碱激发剂激发铝硅酸盐前驱体而成的新型环境友好型无机胶凝材料,其力学性能和耐久性能相比普通硅酸盐水泥更优异,被视作普通硅酸盐水泥的实用替代品。近年来,由于火灾频发,耐高温性能研究引起了广泛的关注。地聚物经过水化反应,得到的无定型态的硅铝网状三维凝胶网状结构,在高温作用下不易分解,因此相较于传统的硅酸盐水泥,拥有更优异的耐高温性能。为此,整理国内外相关研究,分析探讨地聚合物耐高温性能的影响因素、强度变化后的机理分析,以及提高地聚合物高温后力学性能的措施。在此基础上,提出研究展望,为地聚物水泥耐高温性能的进一步研究提供理论基础。

Geopolymer,an inorganic cementitious material of eco-friendly nature,is created by the activation of aluminosilicate precursors with alkali initiators.Its mechanical properties and durability are better than those of regular Portland cement,making it a viable substitute for the latter.In the past few years,the study on high temperature resistance has appeal to widespread attention owing to frequent fires.The amorphous silica-aluminum network zeolite-like three-dimensional structure makes the geopolymer have the characteristics of ceramics,which is not easy to decompose under high temperature,contributing to much better high temperature resistance than ordinary Portland cement.In this paper,relevant studies at home and abroad are sorted out,and the influencing factors of high temperature resistance of geopolymers,the mechanism analysis after strength changes,and the measures to improve the mechanical properties of geopolymers after high temperature are analyzed.On this basis,it then proposes a research prospect that provides a theoretical foundation for further exploration of high temperature resistance of geopolymer cement.