The effects of permeable formworks with sucker liners on the physical properties of concrete surfaces

In this study, the effects of formwork, with drainage holes that are attached with different liners, on the physical properties of concrete surfaces are investigated. Nine formworks, three of them normal (reference) and six of them with drainage holes, were prepared. The three formworks, which had drainage holes, were attached with type I geotextile + hessian and the remaining three were attached with type II geotextile. Blow hole ratio, surface hardness by using the rebound hammer test, pull-off strength, carbonation, chloride penetration, sorptivity and abrasion resistance tests were measured on concrete blocks which were cast with the three types of formwork. It was observed that the concrete that was made with formwork attached with type II geotextile had better surface properties than that made with the reference formwork and formwork attached with type I geotextile + hessian. (C) 2001 Elsevier Science Ltd. All rights reserved.