Effect of w/c ratio on workability and mechanical properties of high strength Self Compacting Concrete (M70 grade)

Abstract

This paper presents the results of an experimental research on the workability and mechanical properties of self-compacting concrete. The work focused on concrete mixes having Water/Cement ratios of 0.23, 0.24, 0.25, 0.26 and 0.27, with a Packing Factor of 1.12. The Concrete mixes contains different proportions of GGBS, Super plasticizers, water binder ratios and constant proportions of Cement, Micro Silica, VMA, Coarse aggregate and Fine aggregate for different Water Cement ratios. The percentage of Micro Silica added is 7% for all mixes. The mix proportions are obtained on the basis of NAN-SU mix design. All the mixes contain Cement of 574 kg/m 3 but with different total binder content. The workability tests performed in this research were as per EFNARC. Based upon the experimental results, for water cement ratio 0.25 fresh and hardened state properties of high strength self-compacting concrete are moderate.