IJIRST –International Journal for Innovative Research in Science & Technology| Volume 3 | Issue 10 | March 2017 ISSN (online): 2349-6010 All rights reserved by www.ijirst.org 168 Durability Studies on Concrete by using Groundnut Shell Ash as Mineral Admixture Dharani D Arivu Thiravida Selvan V Assistant Professor Assistant Professor Department of Civil Engineering Department of Civil Engineering SVS college of Engineering, Coimbatore, India SVS college of Engineering, Coimbatore, India Abstract This paper illustrates about the use of groundnut shell ash as a mineral admixture for partial replacement of cement. Chemical analysis for groundnut shell ash was carried out, it shows that it have better pozzolanic properties. Effect of groundnut shell ash for M25 grade of concrete was investigated. Cement is partially replaced with 10%, 15%, 20%, 25% and 30% of groundnut shell ash. Compressive strength test should be carried at 7 and 28 days of curing. The results shows that compressive strength of concrete increases at 10% replacement, after that it get decreases due to presence of potassium oxide in ash content which disrupts the concrete. The durability test shows that the GSA concrete is better resistance to acid, chloride and water absorption. Keywords: groundnut shell ash, compressive strength test, water absorption test, chloride attack test, Acid attack test _______________________________________________________________________________________________________ I. INTRODUCTION Concrete is one of the most popular materials in construction. When it is reinforced with steel, it has a higher load carrying capacity. Concrete is a heterogeneous material which is composed of aggregates bonded together with fluid cement . Cement is the binding material which contains lime, silica, alumina and iron oxide. But the production of cement does not meets our requirement and causes global warming due to releases of large amount of CO2 in the environment. To overcome such difficulties some natural agricultural wastes are used. The agricultural waste such as groundnut shell ash, sugarcane bagasse ash and rice husk ash etc are used. The use of groundnut shell ash will contribute to the production of higher quality concrete at lower cost and also reduces the environmental pollution. GSA has better pozzolanic property. It contains silica, lime, magnesium oxide, iron oxide and aluminium oxide. GSA when react with calcium hydroxide during hydration which forms additional calcium silicate hydrate gel. The pozzolanic activity of ash increases with increases of time. The addition of GSA in cement concrete may reduce drying shrinkage, water absorption, but increases the setting time. Increases of setting time are due to slow reactivity of GSA. The presence of GSA may block the existing pore structure of concrete and thereby increasing its strength and impermeability. GSA shows improved workability at lower replacement level, reduced permeability, and low heat of hydration and higher resistance to chemical attack and also smaller diffusion rate of chloride ions resulting in a higher resistance of steel from corrosion. The main object is to find a solution to reduce the environmental pollution due to cement manufacturing by using GSA. The chemical composition for groundnut shell is given below. Table – 1 Chemical Composition of Groundnut shell Ash Ingredient Percentage Loss of Ignition 7.85 Sand and Silica 53.50 Calcium Oxide 4.68 Magnesium Oxide 2.25 Iron Oxide 4.80 Aluminium Oxide 2.75 Alkalis 18.30 II. MATERIALS Cement Ordinary Portland Cement of 53 grade locally available is used in this investigation. The cement is tested for various properties as per the code IS: 4031-1988 and it is found to be conforming to various specification of IS: 12269-1987 having specific gravity of 3.15.
Durability Studies on Concrete by using Groundnut Shell Ash as Mineral Admixture
Apr 27, 2023
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