Partial replacement of fine aggregate by steel slag and coarse aggregate by walnut shell in concrete

Abstract

Global warming and environment destruction have become the major issue in recent years. Emission of greenhouse gases from industries has impact on climate change. Preventing the depletion of natural resources and enhancing the usage of waste materials has become a challenge to the scientists and engineers. A number of studies have been conducted concerning the protection of natural resources, prevention of environmental pollution and contribution to the economy by using this waste material. Steel slag is an industrial by-product obtained from the steel manufacturing industry. This steel slag damages and affects the environment and it is difficult to decompose. If this product is used in the concrete, it influences both the mechanical and physical properties of concrete along with its durability. Walnut shell is lingo cellulosic material forming the thin endocarp or husk of the walnut shell fruit. It is very hard and takes years and years to decompose or breakdown. To solve the problem in effective manner steel slag and walnut shell is used in concrete by replacing natural aggregates. In this study, the replacement was done with fine aggregate by steel slag for different proportions of 0%, 10%, 20%, 30%, 40%&50% and coarse aggregate by walnut shell at constant proportion of 20%. M30 grade of concrete is used for a water cement ratio of 0.45. Seven mixes were prepared by partially replacing Steel Slag as fine aggregate and Walnut Shell as coarse aggregate and tested for mechanical properties such as Compressive Strength, split tensile strength and flexural strength and durability properties such as water absorption, acid attack and sulphate attack and the results were discussed elaborately.