In this study, in order to investigate absorbing capacity for various expanded materials, falling-weight impact loading tests were conducted taking the kind of expanded material and falling height of weight as variables. After that, the impact loading tests with setting a core slab on upper surface of those expanded materials were conducted. The results obtained from these experiments are as follows: 1) relationships between transmitted impact stress and penetration strain behave similarly to each static loading test result irrespective of with/without core slab; 2) the larger the compressive strength of expanded material, the wider the distributed area of transmitted impact stress; and 3) putting core slab on the expanded material of high compressive strength, the absorbing capacity tends to be more increased.
