Modification of Test Process of PERMIT Ion Migration Test and its Application to Determinate Effect of Methods to Improve Chloride Penetration Resistance of Cover Concrete

摘要

A modification of the testing procedure was adopted to improve the PERMIT ion migration test method, a non-destructive method to evaluate the quality of concrete in real structures. The steady state migration test procedure was reanalyzed from the viewpoint of electrolysis. The peak current obtained in the PERMIT ion migration test correlated well with the chloride diffusivity, the theoretical relationship between these was discussed and an equation for calculating the effective chloride diffusivity in concrete from the peak current was determined. The new process was found to be quicker and more effective than the typical process of the PERMIT ion migration test and to simplify the test procedure. As an application example, the effect of different controlled permeability formworks for improving the resistance of cover concrete to the penetration of chloride ions was investigated using the modified PERMIT ion migration test.