Evaluation of Chloride Ingress into the HFA Concrete by a Steady-State Chloride Migration Test
Takafumi SUGIYAMA and Yukikazu TSUJI
Abstract:Chloride ingress into concrete with high strength lightweight aggregate made of fly ash (HFA aggregate) as the coarse aggregate was evaluated by a steady state migration test and chloride ponding test. It was found that the migration coefficient obtained from the migration test could represent appropriate ranking on chloride ingress into the concrete with different W/Cs. The effect of HFA aggregate on the chloride ingress was negligible and a similar migration coefficient to that of normal weight aggregate was given. In addition, an observation using EPMA showed no chloride ion present in the HFA aggregate itself after the migration test. Chloride ponding test also exhibited same ranking providing increased apparent chloride diffusion coefficients with increased W/C. Migration coefficients might be related quantitatively to the apparent diffusion coefficient with chloride binding isotherm being properly considered. Key Words:High strength lightweight aggregate made of fly ash, Chloride ingress, Migration test, Migration coeff., Chloride ponding test