Shock Wave Propagation Through Heterogeneous Cementitious Composites

Abstract

Because of the current geopolitical situation, research on improving the resistance of the civil and transport infrastructure to blast or impact loads has gained considerable attention in recent years. This paper presents the results of full-scale blast experiments designed to characterize the resistance of steel-fibre-reinforced concrete full-scale bridge decks subjected to near-field blast loading. Twenty-five kilogrammes of TNT charges were placed on steel chairs in the middle of each slab. The specimens were concrete slabs 6 m in length, 1.5 m in width and 0.3 m in thickness. Following, slabs with multiple placements of basalt mesh were used. The basalt mesh was placed at the half of both upper and lower concrete cover and three times in between both layers of panel reinforcement. To conclude, slabs with deformable layer were used. The layer was made of shredded textiles slabs, 80 mm thick. These slabs were placed in the middle of the slab cross section. The experimental programme was recorded by high-speed cameras, and the recordings were supplemented by PDV (Photon Doppler Velocimetry) measurements of the acceleration of the bottom surface of the studied specimens. Conclusions are drawn from the utilization of the PDV measurements to studying of shock wave propagation through heterogeneous cementitious composites.