Durability of fly ash-based alkali-activated mortars reinforced with short hemp fibres

Author(s): Bojan Poletanović (1), Ivan Janotka (2), Michal Bačuvčik (2), Ildiko Merta
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS2019) New Generation of Construction Materials
Editor(s): Marijana Serdar, Nina Štirmer, John Provis
ISBN: 978-2-35158-217-6,
Vol 1. ISBN: 978-2-35158-223-7
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Total Pages: 8
Language : English

Abstract: The aim of this research was to investigate the durability of hemp fibre reinforced alkali-activated mortars by means of the composites mechanical properties under accelerated agingof wet/dry cycles. The mortar matrix contained fly ash as a binder, sodium water glass as anactivator and sand with a particle size between 0.4 and 0.8 mm. As reinforcement hemp fibresof 10 mm in length and of volume ratio 1% in composite were used. The alkali-activatedmortars underwent accelerated aging (10 wet/dry cycles) and their mechanical properties priorto and after aging compared.
It was shown that under accelerated aging conditions of wet/dry cycles hemp fibre reinforcedfly-ash based alkali-activated mortars exhibit a significant decrease in their compressive- andflexural strength (36% and 34% respectively) as well as flexural toughness (34%). Thus inorder to ensure the long-term durability of these composites, hemp fibres should be protectedfrom degradation within the high alkaline matrix.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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