Blast mitigation by a full-scale concrete wall

Blast mitigation by a full-scale concrete wall was evaluated. Cylindrically shaped TNT, weight of 80 kg was put on a wooden table, height of 0.6 or 0.8 m. Two kinds of concrete walls, height of 2.5 rn from the ground level and width of 4 m were prepared. The distance from the TNT to the wall was 2 m. The blast pressure was measured at a total of 12 points., at four distances in three directions. The directions were 20 degrees, 45 degrees, and 90 degrees, where 0 degrees was defined as the vertical from the TNT to the wall plane. The scaled distance from the TNT was 2. 4, 8, and 16 m center dot kg(-1/3). The peak pressure at direction of 20 degrees and scaled distance of 4 m center dot kg(-1/3) was remarkably mitigated. The peak pressure at direction of 20 degrees and scaled distance of 8 and 16 m center dot kg(-1/3) was almost the same as that without the wall. The peak pressure at direction of 45 degrees and 90 degrees was lower and higher, respectively, regardless of the distance. The impulse was mitigated at the point of direction of 45 degrees and 4 m center dot kg(-1/3). However, the obvious mitigation was not observed at all other points. Precise data. including typical blast wave profiles and the blast parameters, are presented in the text.