Title:
A Prediction Method for Long-term Chloride Concentration Profiles in Hardened Cement Matrix Materials
Author(s):
T. H. Wee, S. F. Wong, S. Swaddiwudhipong, and S. L. Lee
Publication:
Materials Journal
Volume:
94
Issue:
6
Appears on pages(s):
564-576
Keywords:
chlorides; models; mortars (materials); portland cement;
DOI:
10.14359/341
Date:
11/1/1997
Abstract:
A method to predict long-term chloride concentration profiles in 100 percent ordinary portland cement (OPC) paste, mortar, and concrete with water-cement ratios in the range of a 0.4 to 0.6 is presented. This approach of using the semi-empirical models enables an engineer who performs core sampling to predict the future chloride concentration profile of concrete structures in the submerged zone. The variation in chloride binding, with respect to the amount of cement hydrates available as a function of time and with respect to the amount of free chloride ions present as a function of distance from the surface, is also incorporated in the modeling so that the mechanisms of chloride ingress are better represented. Good correlation is observed between analytical results obtained based on the proposed method and experimental data reported in the literature. This confirms the applicability and reliability of the proposed prediction method.