Effect of Aggregate Size on the Spalling of High-Strength Wall Panels Exposed to Hydrocarbon Fire
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 12
Abstract
Concrete spalling has been widely accepted as being caused by a thermomechanical process resulting from high thermal gradients, as well as a moisture-clog process attributable to the buildup of pore-water pressure. The effect of aggregate size on the influence of concrete spalling of tilt-up wall panels after exposure to a hydrocarbon fire is studied in this paper. Six reinforced high-strength concrete wall panels in dimension, loaded by self-weight only and consisting of 7-, 14-, and 20-mm aggregate sizes were exposed to the hydrocarbon fire curve for a period of 120 min. The specimens were approximately 70 MPa at the test date and were instrumented with in situ thermocouples to predict steam pressures based on thermal diffusivity calculations. The degree of spalling was quantified by mass loss with both solid mass and water mass being independently calculated. The concept of nominal spalling depth was introduced as a new way of quantifying the degree of spalling. The results show that aggregate size is an influencing parameter in regard to concrete spalling, with the degree of spalling ranging from 13 to 33%, respectively. Spalling is more prominent for smaller-size aggregates because of the facture-zone process.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 21, 2016
Accepted: May 31, 2017
Published online: Sep 25, 2017
Published in print: Dec 1, 2017
Discussion open until: Feb 25, 2018
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