JPS6420102A - Surface treatment method of concrete structure - Google Patents

Abstract

PURPOSE:To enable improvement of a surface layer of the concrete structure into a good formation and to improve adhesive strength of a concrete structure to a matter to be stuck, by a method wherein framing is performed by the concrete form work lined with a sheet whose surface is of an uneven state and water absorbing properties, concrete is placed within the concrete form work and marks of unevenness of a water absorbing sheet are molded on the surface of the concrete. CONSTITUTION:A concrete form work 1 is manufactured by fixing an odd-shaped water absorbing sheet 3 to a concrete form work surface of a form work body 2 by making use of a fixing pin or nail, and the concrete form work 1 is mounted by facing on a longitudinal direction of an abutting position becoming an expected surface of a joint surface of deposition. Concrete 4 is placed within the concrete form work 1, vibration is applied to the concrete 4 and the concrete 4 is tamped by pushing the concrete 4 with a push rod. Then the expected surface of a joint of the concrete 4 is molded into an uneven state by following after unevenness of an odd-shaped water absorbing sheet 3 of the concrete for work 1. Surplus water which comes up to the surface of the expected surface of the joint of the concrete 4 is absorbed by the odd-shaped water absorbing sheet 3 and collected. In addition, bubbled which come up to the surface of the expected surface of the joint of the concrete are discharged outside of the concrete form work 1 through a microscopic hole 31 group of the odd-shaped water absorbing sheet 3 and a surface layer part of the expected surface of the joint of the concrete 4 is improved into a favorable formation where water-cement ratio is high.