Pore structure profile of ambient temperature-cured geopolymer concrete and its effect on engineering properties

被引:3
|
作者
Negahban, Ehsan [1 ]
Bagheri, Ali [1 ]
Sanjayan, Jay [1 ]
机构
[1] Swinburne Univ Technol, Ctr Sustainable Infrastruct & Digital Construct, Dept Civil & Construct Engn, Hawthorn, Vic 3122, Australia
基金
澳大利亚研究理事会;
关键词
Geopolymer concrete; Ambient-temperature curing; Microstructure; Porosimetry; SEM; ASH-BASED GEOPOLYMER; ONE-PART GEOPOLYMER; FLY-ASH; MECHANICAL-PROPERTIES; DRYING SHRINKAGE; SIZE DISTRIBUTION; SODIUM-HYDROXIDE; SLAG; STRENGTH; CEMENT;
D O I
10.1016/j.conbuildmat.2023.133311
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Ambient temperature-cured geopolymer concrete (GPC) with solid alkali activators are attracting attention as an eco-friendly alternative to OPC-based concrete (OPCC) for industrial applications. This research investigates the pore structure and microstructural characteristics of GPC via porosimetry and micrography and strives to connect the micro-scale characteristics to macro-scale engineering properties. The dominance of slag and low water content resulted in a denser and more homogenous microstructure in the binder with fewer microcracks and voids. Furthermore, a refined pore structure was observed when the fly ash/slag ratio was 60/40. The porosimetry analysis demonstrated that OPCC possessed a uniform pore structure with a similar porosity profile throughout the concrete cross-section. GPC showed a descending pore gradation profile from top to bottom. The difference in the pore structure profiles can explain the previously witnessed shrinkage behaviour of GPC and OPCC in restrained conditions.
引用
收藏
页数:24
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