Method of Application of Two-Shot Shotcrete

摘要

PURPOSE: An application method of two-shot shotcrete is provided to minimize a rebound rate of wet-type shotcrete mortar. CONSTITUTION: The application method of two-shot shotcrete comprises the steps of: applying B-type shotcrete mortar composed of cement, fine aggregate, water and accelerator to construct a B-type shotcrete mortar layer of adhesive coarse aggregate to a thickness of 10 millimeters on the wall of a tunnel; applying A-type shotcrete mortar composed of cement, coarse aggregate, fine aggregate, water and accelerator to construct an A-type shotcrete mortar layer to a thickness of 40 millimeters; and repeating above steps twice.