Understanding Chloride Percentages
Richard D. GaynorI
Appears on pages(s):
chlorides; concretes; prestressed concrete; reinforced concrete; specifications; tests.
During the past few years, there has been a dramatic change in the atti-tude of specifiers and concrete technologists toward the use of calcium chloride in concrete. Traditionally, admixtures containing chlorides have been banned from use in prestressed concrete, and increasingly it has been recognized that they should not be used in concrete over galvanized metal decks. In 1977, ACI Committee 201 in the Guide to Durable Concrete rec-ommended the limits shown in Table 1 for the water-soluble chloride ion con-tent of concrete, expressed as a percentage of weight of the cement. In 1983, the ACI Building Code 318-83 adopted the similar, but somewhat more liberal, limits in Table 2.