ABSTRACT
In recent years, reinforced concrete slab of a highway bridge is reported deteriorated by the salt damage. The deterioration due to salt damage, deterioration of the slab near the top surface is remarkable. The main inspection method is a visual inspection and hammering test, and obtaining quantitative results is difficult. This report, we have investigated for focusing on impact acoustics method is one of the non-destructive inspect method to detect the deterioration of the RC slab from the top surface of asphalt concrete pavement. Result of studies, by using the impact acoustics method, it was confirmed that it may be considered a deterioration of RC slab inside.
