Proportion of high strength, high performance concrete with capability to reduce shrinkage

Abstract

     High strength, high performance concrete mixtures are usually produced with water/binder  0.4, where normal density aggregates are used. To achieve this¸(W/B) ratios in the range of 0.2  low W/B ratio and maintain proper workability it is necessary to use water reducing admixtures. Often this is not sufficient to produce very high strength concrete mixes with compressive strength above 80 MPa and therefore, it is necessary to add mineral admixtures such as silica fume, fly ash, and slag are used in order to increase the high performance of concrete. However, when concrete have low water to binder ratio the shrinkage don't avoid because the volume changes occur in concrete as a result of drying, self-desiccation, chemical reactions, and temperature change. For this reason, in this report some mixes of HS-HPC are designed with shrinkage reducing admixture (SRA) to aim reducing shrinkage of concrete.