Fire spalling of concrete, as studied by NMR

Title: Fire spalling of concrete, as studied by NMR
Author(s): G.H.A. van der Heijden, L. Pel and O.C.G. Adan
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: 353 - 360
Total Pages: 8
Nb references: 17
Language: English

Abstract: The moisture transport in concrete subjected to fire is one of the most important processes with respect to fire spalling. The research on fire spalling of concrete is currently lacking experimental information of the moisture transport processes. We present combined moisture content and temperature profiles of one-sided heated concrete samples measured with our dedicated NMR setup. The concrete sample was equilibrated at a moisture content of 97 % RH. The moisture content can be measured quantitatively and non-destructively while heating up the sample one sided to 500 oC. We present the first experimental proof for the built up of a moisture peak in concrete, and the formation of a saturated layer. The temperatures meausured at the boiling front indicate a vapour pressure in the order of 1.8 MPa. A simple vapour transport model was successfully used to describe the speed of the
boiling front.

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