Experimental assessment of the contribution of synthetic fibers to the moisture release of concrete exposed to high temperatures
Title: Experimental assessment of the contribution of synthetic fibers to the moisture release of concrete exposed to high temperatures
Author(s): J.A. Capote, D. Alvear, O.V. Abreu and J. Crespo
Paper category : conference
Book title: 2nd International RILEM Workshop on Concrete Spalling due to Fire Exposure
Editor(s): E.A.B. Koenders and F. Dehn
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 103 - 112
Total Pages: 10
Nb references: 10
Abstract: Polypropylene fibres are being used effectively as an alternative to reduce the pore pressure in concrete exposed to fire. This reduction is done through various mechanisms of action, which include discontinuous reservoirs to accommodate the water vapour that is expanded and by the formation of continuous channels for the migration of steam and moisture. In the present work a methodology based on small-scale mass loss calorimetry tests inspired by thermogravimetric analysis is proposed. The test was set up to assess the contribution of the fibres to the moisture release and the temperature development in small concrete samples exposed to a fast unidirectional heating.
Result shows that the initial moisture condition and the fibres content play an important role in the material’s behaviour against thermal exposure. The addition of fibres improves up to 166 % the peak of mass loss rate and contributes to delay the increase in temperature.
Surface temperatures were slightly incremented as fibres dosage increase. Important mass loss rate gains were observed in the initial stages of thermal exposure before fibres vaporization.
Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00