Abstract
As shortening the construction period is demanded and the number of expert craftsmen is decreasing, the using of self-leveling material as the floor substrate is increasing. Highly-strengthed self-leveling material is developed in recent years is able to be used as coated floor substrate. However, when a crack occurs in concrete slab, a crack also occurs in finishing coat because self-leveling material don't have crack followability. Therefore, we examined that ensure the crack followability of self-leveling material by the buffer layer between concrete slab and self-levering material.