CONCRETE HARDENING RETARDER AND CONSTRUCTION METHOD FOR WASHING CONCRETE SURFACE USING THE RETARDER

摘要

PROBLEM TO BE SOLVED: To provide a construction method for washing a concrete surface making it possible for any one to perform the operation for exposure to air of the aggregate in concrete simply without needing skill.;SOLUTION: The construction method for washing the concrete surface comprises spraying a concrete hardening retarder on an unhardened concrete surface after completion of concrete placing to delay the hardening of the thin layer concrete portions, and removing cement mortar of the unhardened thin layer portions after the inside of concrete is hardened to expose the aggregate to air. The concrete hardening retarder is prepared by mixing a liquid concrete hardening retarder with artificial sand, heating, drying and granulating.;COPYRIGHT: (C)2006,JPO&NCIPI