The article presents the causes and effects of explosive concrete spalling, which can occur in transport tunnels during a fire. This phenomenon poses a serious threat to rescue teams and significantly reduces the strength and safety of the structure. Particular attention is paid to the use of polypropylene fibers as an additive to concrete as an antidote to explosive spalling of concrete exposed to high temperatures.Transport tunnels are the domain of highly developed countries, most often with mountainous terrain. In Poland, apart from the Warsaw metro tunnel, such facilities have not been widely present so far, but recently, tunnels are increasingly being used in larger Polish cities and industrial agglomerations to reorganize and improve traffic. In addition to the undoubted benefits for road transport, underground transport facilities create serious problems resulting from the need to ensure safety for their users, including fire safety. Disasters in tunnels, especially when accompanied by a fire, are difficult for rescue services to control in a short time.
The Main School of Fire Service, Faculty of Fire Safety, POLAND, Warsaw 01-629, Slowackiego 52/54. (…)
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Source: Logistyka Magazine
The risk of explosive concrete spalling during a fire in transport tunnels – PDF file for download