Durability of hemp fibers in the alkaline environment of cement matrix

Author(s): I. Merta, K. Kopecskó, E.K. Tschegg
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 671 - 679
Total Pages: 8
Language: English

The application of natural fibres as fibre reinforcement in cementitious matrices such as concrete has launched extensive research interest in recent decades. The main concern, however, is the durability of fibres in the alkaline environment of cement.
In this research project the durability of hemp fibres in the alkaline environment of cement matrix in terms of tension strength loss has been experimentally investigated. The objective was to find the most effective protective agent which will reduce water absorption of fibres and, in a long-term preserves the tension strength loss of fibres. The protective substances used to saturate the fibres providing the water resistance protection were: linseed oil, linseed oil with catalyst, paraffin, and beam wax. The protected and unprotected hemp fibres were than immersed in saturated lime solution and Lawrence solution simulating the alkaline environment. Accelerated aging tests have been carried out in order to simulate a time elapse of 2 and 15 year. The tension strength of the fibres has been measured and the results compared.
Linseed oil with catalyst seemed to offer the best protection against the alkaline environment, since there was up to 10% loss in tensile strength within a time of simulated 2 years. The most ineffective protective agent was paraffin and beam wax where an average tension strength loss of about 60% within 2 years has been obtained.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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