Material and glass-fibre-reinforced polymer bond properties of geopolymer concrete

Minhao Dong, Wei Feng, Mohamed Elchalakani, Gang Kevin Li, Ali Karrech, M. Neaz Sheikh

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Geopolymers are recognised for their environmental benefits and excellent chloride and sulfate resistance. However, information on the material characteristics and bond behaviour of geopolymers based on fly ash (FA) and slag is still relatively scarce. This paper presents a comprehensive study on the integration of two modern construction materials – geopolymer concrete (GPC) based on FA and ground granulated blast-furnace slag and glassfibre-reinforced polymer (GFRP) bars. The aim of the study was to assist concrete structural design by identifying the key preparation parameters such as hardening and bond behaviour. It was found that the hardening of the GPC was much faster than that of ordinary Portland cement (OPC) concrete at an early age and the stress–strain curves, elastic moduli and splitting tensile strengths of the GPC were accurately predicted by existing models developed for OPC concrete. The GFRP bars in the GPC outperformed those in the OPC concrete in terms of normalised bond strength. The GPC reinforced with both GFRP and steel rebars exhibited similar bond–slip curves to the OPC concrete. Overall, the behaviour of the GFRP-reinforced GPC was found to be analogous to that of the OPC concrete while providing adequate compressive, tensile and bond strength for the construction of foundations of low-rise buildings.

Original languageEnglish
Pages (from-to)509-525
Number of pages17
JournalMagazine of Concrete Research
Volume72
Issue number10
DOIs
Publication statusPublished - 1 May 2020

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