EVALUATION OF MIGRATION CHARACTERISTICS OF OPC AND SLAG CONCRETE FROM THE RAPID CHLORIDE MIGRATION TEST

Abstract

In this study, the non-steady state chloride migration coefficient in concrete was measured using the rapid chloride migration (RCM) test. After completing the test, we established the specimen's chloride profile by collecting concrete powder samples at predetermined, controlled depths. In order to investigate whether the RCM (NT BUILD 492) can be applied to slag concrete, we made ordinary Portland cement (OPC) concrete and slag concrete with different water binder (w/b) ratios. The combined results from the concrete chloride profile and regression analysis demonstrated that the NT BUILD 492 RCM method can be successfully applied to slag concrete. In summary, a good correlation was observed between the initial 30 V current obtained from the RCM and the chloride migration coefficient obtained from RCM. Thus, the initial current can be used to determine the chloride migration coefficient obtained using the colorimetric method.