Analysis on the Carbonation of Concrete Based on Investigation of Existing Buildings

Optimal Maintenance Plan for RC Members by Minimizing Life-Cycle Cost Including Deterioration Risk Due to Carbonation

“…In the simulation, corrosion is considered to have occurred when the probability of corrosion initiation exceeds 10%, with a level of confidence of 90% (failure probability of 10%) to be consistent with the prediction of corrosion initiation based on ASTM C876 1991. In the probabilistic analysis, the carbonation coefficient and concrete cover are treated as lognormal random variables with coefficients of variation of 45% (Kawanishi et al 2006) and 20% (Kato et al 2005), respectively. sion in these two stages is assumed to be the same, and this rate is treated as a lognormal random variable with a mean equal to 0.06%/year (percentage weight loss) (Tottori et al 2004) and a coefficient of variation of 50% (Takahashi et al 2005).…”

Evaluation and Prediction Method on Neutralization of Supplied Long-term Hydraulic Concrete Structure

“…(2) is not always available for the prediction of neutralization if neither inspection data nor drawing and specifications were remained. Furthermore, Kawanishi et al have reported that constant a was changed under some distinctive environmental conditions [2]. As the mix, proportion of hardened concrete is impossible to estimate accurately, it is necessary to clarify the influence of supplemental environment to neutralization of concrete in order to improve the precision on evaluation and prediction of neutralization.…”