期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 47, 期 -, 页码 990-1000出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.06.002
关键词
Tunnel pavements; Bitumen; Fire behaviour; Cone calorimeter; Nano-clay modification; Flame retardant fillers
Fires in highway tunnels produce high temperatures, heat radiation, low visibility, and several toxic and dangerous gases. Thus, materials used in tunnel structures should be designed in order to limit such problems. The present work addresses the formulation of asphalt mixtures with fire retardant properties based on: (i) the substitution of traditional mineral filler with specific flame retardants (FR) like aluminium hydroxide (ATH) and magnesium hydroxide (MH); (ii) the use of asphalt binders nano-modified with organo-clays. The fire behaviour and the smoke release properties of the mixtures were evaluated by means of cone calorimeter test. Among the FR fillers, ATH gave the most encouraging results in terms of heat and smoke releases. The simultaneous use of FR and nanocomposite asphalt binder gives a synergic effect which significantly changes and improves the fire behaviour of the mixtures. (C) 2013 Elsevier Ltd. All rights reserved.
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