Blast-resistant performance of a two-stage concrete plate subjected to contact explosions. (30th October 2020) - Ichino, Hiroyoshi
Highlights: Localized failure of a two-stage concrete (TSC) subjected to explosions was examined. The blast-resistant performance of TSC and regular concrete are nearly equivalent. The ratio between TSC plate thickness and failure depth has been formulated. The choice of aggregate plays a critical role in the blast-resistance of TSC. Abstract: Threats posed by explosions due to terrorism or industrial accidents should be considered in the structural design of infrastructure and other valuable facilities. Protective structures, such as perimeter concrete walls, are effective at reducing explosive damage. Although two-stage concrete (TSC) has some advantages over conventional concrete in constructing such protective structures, studies concerning the behavior of TSC subjected to blast loads are very limited. In the current study, the effects of TSC strength, maximum diameter of coarse aggregate, and type of coarse aggregate are examined experimentally to determine how these parameters affect the local failure of a TSC plate subjected to contact explosion. For various TSC strengths and properties of coarse aggregate, critical values of spall occurrence as a function of plate thickness and charge mass are provided, and prediction equations of local failure depth are provided.