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A conceptual proposal for retrofitting old dams such as the Old Aswan dam in Egypt is by using a shrinkage-reduced concrete mix. Cracking potential is closely related to the shrinkage rate rather than the shrinkage magnitude. In this paper three types of cement are used, Ordinary Portland cement, Sulphate Resisting cement, and Slag cement. The concrete mixes have three different cement contents with and without admixture. The results show that the increase of cement content tends to increase drying shrinkage. For the three types of cement, the maximum shrinkage of concrete mixes with 350 kg/m 3 )590 Lb/yd) cement content is 35%-55% less than the maximum shrinkage of concrete mixes with higher cement contents. For Sulphate Resisting cement concrete mixes, adding 1% superplasticizer of cement content results in decreasing shrinkage up to 38% compared with mixes without admixture.

A Shrinkage-Reduced Concrete Mix Design for Rehabilitation of Old Dams