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Open AccessArticle

Study of Strain-Hardening Behaviour of Fibre-Reinforced Alkali-Activated Fly Ash Cement

by Hyuk Lee 1,*,†, Vanissorn Vimonsatit 1,†, Priyan Mendis 2,† and Ayman Nassif 3
School of Civil and Mechanical Engineering, Curtin University, Perth, WA 6102, Australia
Department of Infrastructure Engineering, University of Melbourne, Parkville, VIC 3010, Australia
School of Civil Engineering and Surveying, The University of Portsmouth, Portsmouth, Hampshire PO1 2UP, UK
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2019, 12(23), 4015;
Received: 25 October 2019 / Revised: 27 November 2019 / Accepted: 29 November 2019 / Published: 3 December 2019
(This article belongs to the Special Issue Supplementary Cementitious Materials in Concrete)
This paper presents a study of parameters affecting the fibre pull out capacity and strain-hardening behaviour of fibre-reinforced alkali-activated cement composite (AAC). Fly ash is a common aluminosilicate source in AAC and was used in this study to create fly ash based AAC. Based on a numerical study using Taguchi’s design of experiment (DOE) approach, the effect of parameters on the fibre pull out capacity was identified. The fibre pull out force between the AAC matrix and the fibre depends greatly on the fibre diameter and embedded length. The fibre pull out test was conducted on alkali-activated cement with a capacity in a range of 0.8 to 1.0 MPa. The strain-hardening behaviour of alkali-activated cement was determined based on its compressive and flexural strengths. While achieving the strain-hardening behaviour of the AAC composite, the compressive strength decreases, and fine materials in the composite contribute to decreasing in the flexural strength and strain capacity. The composite critical energy release rate in AAC matrix was determined to be approximately 0.01 kJ/m 2 based on a nanoindentation approach. The results of the flexural performance indicate that the critical energy release rate of alkali-activated cement matrix should be less than 0.01 kJ/m 2 to achieve the strain-hardening behaviour. View Full-Text
Keywords: fibre reinforced; alkali-activated; strain hardening fibre reinforced; alkali-activated; strain hardening
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Lee, H.; Vimonsatit, V.; Mendis, P.; Nassif, A. Study of Strain-Hardening Behaviour of Fibre-Reinforced Alkali-Activated Fly Ash Cement. Materials 2019, 12, 4015.

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