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Fibers 2018, 6(2), 30;

Indirect Tensile Behaviour of Fibre Reinforced Alkali-Activated Composites

CONSTRUCT, Faculty of Engineering (FEUP), University of Porto, 4200-465 Porto, Portugal
ISISE, Department of Civil Engineering, University of Minho, 4800-058 Guimarães, Portugal
Department of Engineering, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
Author to whom correspondence should be addressed.
Received: 19 February 2018 / Revised: 26 March 2018 / Accepted: 12 April 2018 / Published: 14 May 2018
(This article belongs to the Special Issue Geopolymer Based Fiber Reinforced Composites)
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There are currently still some sustainability-related issues that need to be tackled within the construction sector. Namely, cement production is accountable for nearby 5% of the worldwide total CO2-eq release. Therefore, environmentally viable and economically sustainable solutions need to be pursued in order to mitigate the use of Portland cement. The incorporation of industrial waste in concrete compositions, such as fly ash (from coal combustion in power stations) is a feasible alternative. The properties of these residues may be enhanced through alkaline activation, which is able to yield aluminosilicate-based materials with excellent physico-chemical properties. Nonetheless, these materials exhibit a brittle behaviour. Therefore, the present work addresses the study of alkali-activated composites reinforced with sisal fibres. For that purpose, alkali-activated Class F fly ash was mixed with natural fibres and the composite mechanical behaviour was assessed through both indirect tensile and compressive tests. Four different fibre contents, in wt % of fly ash (0, 0.2, 0.6 and 1%), two fibre lengths (13 and 50 mm) and four curing periods (14, 28, 56 and 112 days) were considered. Results confirm that the post-cracking response of these composites was improved with the inclusion of sisal fibres. In general, higher residual tensile strengths and dissipated energy were observed for the lengthier fibres, i.e., 50 mm. View Full-Text
Keywords: alkaline activation; natural fibres; fly ash; post-cracking behaviour alkaline activation; natural fibres; fly ash; post-cracking behaviour

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Almeida, F.; Cunha, V.M.C.F.; Miranda, T.; Cristelo, N. Indirect Tensile Behaviour of Fibre Reinforced Alkali-Activated Composites. Fibers 2018, 6, 30.

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