Comparison on the properties of ITZs in fly ash-based geopolymer and Portland cement concretes with equivalent flowability

被引：121

作者：

Luo, Zhiyu ^{[1
]}

Li, Wengui ^{[1
]}

Wang, Kejin ^{[2
]}

Castel, Arnaud ^{[1
]}

Shah, Surendra P. ^{[3
]}

机构：

[1] Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia

[2] Iowa State Univ, Dept Civil Construct & Environm Engn, Ames, IA 50011 USA

[3] Univ Texas Arlington, Ctr Adv Construct Mat, Arlington, TX 76019 USA

来源：

CEMENT AND CONCRETE RESEARCH | 2021年 / 143卷

基金：

澳大利亚研究理事会;

关键词：

Geopolymer concrete; Interfacial transition zone (ITZ); Nanoindentation; Micromechanical properties; Microstructure;

D O I：

10.1016/j.cemconres.2021.106392

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper aims to compare the properties of interfacial transition zones (ITZs) in Portland cement (PC) concrete and geopolymer concrete. Portland cement and geopolymer pastes were designed with the equivalent flowability to provide similar mix and casting condition of ITZs. Two types of modelled ITZs were prepared to facilitate the nanoindentations across ITZs, microstructural characterization, and comparison on the properties of ITZs with less influential factors. The results showed that the interfacial bonding of ITZs between geopolymer matrix and aggregate is relatively stronger than the counterpart in the PC concrete. There is a high amount of crystalline hydration products in the ITZs of PC concrete, but a layer gel-rich paste with denser microstructures in the ITZs of geopolymer concrete. Additionally, the interface morphology and nanoindentation analysis indicate that the property of ITZs in the modelled geopolymer concrete is not poorer than that of the corresponding geopolymer paste.

引用

页数：14

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