Abstract :
The mineral admixtures are generally industrial by products and their use can provide a major economic and environmental benefit.The relative performance of various supplementary cementitious material can be compared with that of Portland cement using the practical concept of efficiency factor ‘k’. The utilization of supplementary cementitious material is well accepted because of the several improvements possible in the concrete composites, the present study is an effort to quantify the strength of silica fume at various replacement levels and evaluate their efficiencies in concrete. This study reports the results of an experimental study, conducted to evaluate the strength and strength efficiency factor of hardened concrete, by partial replacing the cement by 5%, 10%, 15%, 20%, 25% of silica fume for M50 grade concrete at ages of 7days, 14days, 28days, 90days. The overall efficiency of silica fumes depending upon percentage replacement of silica fume and age of concrete. The optimum of silica fumes replacement as cementitious material characterized by high compressive strength and low heat of hydration. From this study we concluded that the grain size of silica fume is less than cement, and highly reactive properties causes improve the early strength over short period.
Keyword :
Silica fume, High Compressive strength.