Abstract
This study experimentally analyzed a decrease in the punching shear load-carrying capacity of the deteriorated RC slabs subjected to the salt and frost damages from anti-freezing agent sprayed on the slabs. The results of a surface analysis using the EPMA indicate that the effect of chloride ion concentrations on the corrosion of re-bar far exceeded the critical chloride ion concentration of re-bar, or 1.2 kg/m3. In addition, the results of deterioration diagnosis of re-bar obtained from the core sampling show that the deterioration levels of compression and tension re-bars were in the early and partly in the late acceleration phase, respectively. Further, the results of the test under running vibration loads express that the maximum load-bearing capacity of the RC slabs that sustained the damage decreased by 15% at the maximum as compared with that of the undamaged RC slabs.
