Explosive incidents causing damage to infrastructures have been increased in recent years. To protect people and facilities from explosions, it may be effective to employ a blast-resistant wall. Prepacked concrete has some advantages over the conventional concrete in constructing such protective walls. In this study, the characteristics of local failure of prepacked concrete plates subjected to contact explosions are examined. In these experiments, specimens with a thickness ranging between 50 and 120 millimeters are blasted by 6 to 60-grams C-4 explosive. From the results, it is found that a spall failure of prepacked concrete is prevented when the scaled wall thickness is greater than 3.6 cm/g1/3. Blast-resistant performance of the prepacked concrete is nearly equivalent to that of the conventional concrete from the perspective of preventing spall failure.
