This paper describes research on the effect of chloride migration and chloride diffusion into mortar specimens when the limestone mineral addition in cement was increased from 4.5% to 15% and when limestone mineral addition was used in conjunction with cement kiln dust at up to 5% of the limestone mineral addition. The research also considered the effect of replacing cement with fly ash or slag. Both chloride migration and diffusion results indicated that limestone additions up to 10% did not adversely affect the chloride ingress. Cement kiln dust and the combination of limestone and kiln dust had no significant effect. Supplementary cementitious materials were effective at reducing the chloride ingress.
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