Spalling of concrete as studied by NMR

L. Pel, G.H.A. Heijden, van der, H.P. Huinink

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Samenvatting

During the past twenty years concrete has developed in both strength and durability. A downside to these improvements is the increased risk of explosive spalling in case of fire. Different factors such as heating rate, applied loading, permeability, and moisture saturation play an important role in spalling. One of the explanations for spalling is the pressure build up by evaporating moisture which is unable to escape. To study the moisture migration inside concrete during intense heating a dedicated Nuclear Magnetic Resonance (NMR) setup was built. With this setup one dimensional moisture profiles can be measured as function of time. For the magnetic field a 1.5 T medical scanner (Philips, Gyroscan) is used. The samples can be heated to temperatures up to 250 oC. Preliminary measurements on fired-clay brick and calcium-silicate brick have shown that during heating a receding drying front is observed. In the fired-clay brick the position of the drying front correlates with the position at which 100 oC is reached. However, in both the calcium-silicate brick and the concrete samples the drying front lags behind on the temperature. As a result water is superheated to a temperature above 100 oC, which could result in large pressures. Keywords: NMR concrete spalling moisture temperature
Originele taal-2Engels
TitelProceedings of the 2nd International Symposium on Advances in Concrete through Science and Technology, 11-13 September 2006, Quebec City, Canada
RedacteurenJ. Marchand, B. Bissonnette, R. Gagné, M. Jolin
Plaats van productieBagneux
UitgeverijS.A.R.L.
Pagina's2006-08-02-
ISBN van geprinte versie2-35158-003-6
DOI's
StatusGepubliceerd - 2006
Evenementconference; International Symposium on Advances in Concrete through Science and Technology ; 2 (Quebec) : 2006.09.11-13 -
Duur: 1 jan 2006 → …

Publicatie series

NaamRILEM proceedings
Volume51

Congres

Congresconference; International Symposium on Advances in Concrete through Science and Technology ; 2 (Quebec) : 2006.09.11-13
Periode1/01/06 → …
AnderInternational Symposium on Advances in Concrete through Science and Technology ; 2 (Quebec) : 2006.09.11-13

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