METHOD FOR EXPOSING AGGREGATE OF PRECAST CONCRETE SLAB

摘要

PROBLEM TO BE SOLVED: To provide a method to expose aggregate of precast-concrete(PC) slab of which the mortar components around the aggregate can be rapidly and uniformly removed. SOLUTION: As a method to expose the aggregate. The brush is forced to carry out at least two motion chosen from revolution around the revolutionary axial line which is nearly vertical to the PC slab and rotation, around a rotational axial line with an interval from the revolutionary axial line and, one-way movement in a plane the parallel to the PC slab in a state touching one surface of the PC slab. In this way, the mortar components are removed from one side of the PC slab in a fixed depth, and the aggregate is exposed.