EVALUATION OF AIR-PERMEABILITY OF COVER CONCRETE BY SINGLE CHAMBER METHOD | |
| Conference | 31st Our World in Concrete and Structures (OWICs) - 2006 |
| Authors | K. Imamoto* Ashikaga Institute of Technology, Japan K. Shimozawa, General Building Research Corporation of Japan, Japan M. Nagayama, General Building Research Corporation of Japan, Japan J. Yamasaki, Asanuma Corporation, Japan S. Nimura, Osaka Institute of Technology, Japan |
| Handle | 100031023 |
| Key Words | Air permeability, Non-destructive Testing, Cover concrete, Single-chamber, Vacuum |
| Abstract | The permeability of cover concrete strongly affects the durability of reinforced concrete (RC) structures. This paper deals with a single-chamber method to evaluate the air-permeability of the cover concrete. It is based on methods originally developed by Schönlin and Hilsdorf[1] and Berissi et al. f[2] In Japan, over 400 thousand new RC buildings are constructed each year. Here we describe a simplified air-permeability test method which can be performed by contractors. This method is modified to obtain the robust air-tightness between the chamber and the concrete surface and also to evaluate the moisture content of concrete. In this study, the air-permeable area and the variance of air permeability of full sized concrete walls are experimentally investigated. Tests results indicated that the air permeable area estimated by this method was within 15 to 20mm from the surface of concrete. Consequently it can be used to successfully evaluate the representative air-permeability of cover concrete. Coefficients of variances of A.P.I.s of full sized concrete walls ranged from 33 to 34%, indicating that this test method can evaluate the air-permeability of cover concrete on site. |
| Full Text |  100031023 |
| Link to this page | www.cipremier.com/100031023 |
