DURABILITY OF HEMP FIBRE REINFORCED CEMENTITIOUS MORTARS BY MEANS OF FIBRE PROTECTION AND CEMENT SUBSTITUTION WITH METAKAOLIN

Author(s): Bojan Poletanović (1), Katalin Kopecskó(2), Ildiko Merta (1)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 957-961
Total Pages: 6
Language : English

Abstract: The aim of this research was to investigate the influence of protection of hemp fibres (with linseed oil) and of partial substitution of cement in matrix with metakaolin (in mass ratio 10wt% and 15wt%) on the durability of hemp fibre mortars under severe environmental conditions of freeze/thaw cycles.Cementitious mortars reinforced with discrete short hemp fibres (Cannabis sativa L) were exposed to accelerated aging of 51 freeze/thaw cycles under laboratory conditions and by mean of the composites compression strength, flexural strength and energy absorption capacity in bending its durability assessed.
The results showed that the fibre protection with linseed oil effectively prevents the degradation of the composite after freeze/thaw cycles in term of its compression- and flexural strength, whereas still a significant loss in flexural toughness occur.
In case of partial substitution of cement with metakaolin the results are more promising, the degradation of the composites compression strength under freeze/thaw cycles was completely prevented. The loss in composites flexural strength was prevented only in case of higher substitution rate of cement with metakaolin (15wt%), whereas its flexural toughness still markedly decreased after freeze/thaw cycles.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00