Gas transfers and flow process through concrete maintained in temperature

Title: Gas transfers and flow process through concrete maintained in temperature
Author(s): R. Haniche, G. Debicki, A. Bouamrane, E. Zeltz
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
ISBN: 978-2-35158-118-6
e-ISBN: 978-2-35158-119-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 95 - 102
Total Pages: 8
Nb references: 18
Language: English

Abstract: Some experimental results on gas transfers through heated concrete (at a range of temperature [20° - 200°]) are presented in this paper. The tested concretes were high performance concrete (80-90 MPa), with silica fume, some percentage of polypropylene fibres being or not incorporate (the percentage of fibres vary from 1 to 2.5 kg/m3). A special device similar to a permeameter was used for the identification of fluid-transport properties of concrete. For the results, the used measurements are based on a “quasi permanent” flow rate of fluid through specimens maintained at constant temperature. The test, on a specimen, could take several weeks. The injected fluids under several pressures were an air in a first time through the dried specimen and a vapour in a second time for the same specimen at the same temperature degree. The tests with air shows the permeability evolution of the concrete without and with different percentage of polypropylene fibres when the temperature increases. While the tests with vapour provide information to better understanding the flow process in isotherm conditions, the entered vapour in the porous material condensed to liquid water which left the material under pressure gradient.

Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00