Evaluation of Chloride Penetration in Concrete by Resistivity
Keitaro KABECTakafumi SUGIYAMACKenichiro NAKARAI and Yukikazu TSUJI
Abstract:In present paper the applicability of resistivity of concrete for evaluating chloride penetration is discussed. The resistivity of concrete was measured using an AC power source with 15 voltages and 950Hz. Effective diffusion coefficient of chloride ions in concrete was also determined by chloride migration test that is specified by JSCE G571-2003. Normal concrete with varied W/Cs, fly ash concrete and concrete with high strength lightweight aggregate made of fly ash were studied. Theoretical formula was applied to estimate apparent diffusion coefficient of chloride ions using measured resistivity values. In this calculation the transference number of chloride ions in concrete was determined empirically based on the resistivity tests and the migration tests. Key Words:Resistivity, Migration, Diffusion coefficient of chloride ions, Fly ash concrete, High strength fly ash aggre gate(HFA)