Experimental Investigation to Check the Effect of Fineness of Supplementary Cementious Material on Properties of Concrete

In order to control the demand for the use of Portland cement as well as to increase the durability of structure, although commercial admixtures are available, that imparts additional cost for the construction projects. The use of supplementary cementitious material in production of concrete can result in major saving of energy and cost. It also helps to improve strength, durability, impermeability and chemical resistance of concrete, because material is finer than cement. The present study focuses on the evaluation of the influence of fineness of supplementary Cementous material on properties of concrete. The present study investigates the effects of fineness of Ground Granulated Blast furnace slag and micro silica on M-30 grade concrete. The experimental program is designed to find the compressive, flexural and split tension strength of concrete by partially replacing the cement in concrete production. The replacement levels of cement by GGBS and Micro silica are selected as 30 % and 10% respectively for constant water cement ratio of 0.4. Current experimental study shows that replacement of cement by GGBS and micro silica gives higher strength due to different finesse. For all mixes the average strength of 28 days for respective test specimen is found to be increase by 20% for GGBS and 30% for micro silica.