Abstract: With increase in trend towards the wider use of concrete for pre-stressed concrete and high rise buildings there is a growing demand of concrete with higher compressive strength. Mineral additions which are also known as mineral admixtures have been used with cement for many years. One such material is micro silica which is produced in an electric arc furnace as a by-product of the production of elemental silicons or alloys containing silicon. The aim of the present work is to investigate the possibility of replacing the part of Portland cement by micro silica and fine aggregates by manufactured sand. Due to the storing issues, the waste negatively affects the environment. To solve this problem, an attempt was made to check the effectiveness of micro silica as a partial replacement of Portland cement. In the first phase the feasibility of micro silica with Portland cement was checked by preparing concrete mix of M30 grade and studying the effect of micro silica on mechanical properties of concrete. Portland cement was replaced by micro silica in percentages of 5% i.e., 5%, 10%, 15%, and 20% by weight of cement and evaluating the compressive strength, split tensile strength and flexural strength of concrete. Optimum replacement percentage of micro silica was obtained as 15%. In the second phase the behavior of properties of concrete with optimum micro silica content and various percentage of replacement of natural sand with manufactured sand was studied. Fine aggregate was replaced up to 70% by manufactured sand and evaluating its compressive, split tensile strength and flexural strength of concrete. The optimum percentage of the manufactured sand and optimum micro silica content was found to be 15% Micro silica + 50% Manufactured sand. The concrete with this percentage of micro silica and manufactured sand shows more compressive, tensile and flexural strength compared to conventional concrete.
Keywords: Micro silica; Manufactured sand; Partial replacement; Concrete strength.
Title: An Experimental Investigation on the Strength of Concrete by Partial Replacement of Cement with Micro Silica and Natural Sand with Manufactured Sand
Author: Puneeth G T., Mamatha A
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
Research Publish Journals
