| An assessment was made of the accuracy and precision of ASTM Method C 114 for the analysis of chloride in cured cement paste and concrete.;Cement pastes with water-to-cement ratios of 0.45, containing known different amounts of chloride ranging from 0.0 to 8.0 percent by weight of dry cement, were prepared using ASTM Type I Ordinary Portland Cement. The samples were allowed to cure in a hydrostat for 7 and 28 days with and without rotation and then were analyzed for total chloride content using ASTM Method C 114. Complete extraction of chloride from the cement specimens was not achieved, showing the inability of the above method to bring all the chlorides into solution for analysis. For some of the samples containing high chloride content, the ASTM method under-reported the true values by as much as 70%. |
