201 Effective Utilization of Slag Sand and Ground Granulated Blastfurnace Slag for the Production of Green and Sustainable Concrete M. C. Nataraja*, A. R. Amrutha, G. Chaitra, H. G. Leela, A. M. Rakshith, S. D. Sneha Department of Civil Engineering, Sri Jayachamarajendra College of Engineering, Mysore - 570 006, Karnataka, India. Received 1 st March 2016; Revised 20 th April 2016; Accepted 25 th April 2016 ABSTRACT Concrete can be made sustainable using alternatives to cement, fine aggregate, and coarse aggregate. In this study, slag sand is used as a complete replacement to natural sand and is physically characterized for its properties as per relevant IS codes of practices. Ground granulated blast-furnace slag is used as an alternative to cement, two replacement levels namely 30% and 60% for cement is carried out in this experimental investigation. Fresh concrete properties are determined by conducting compaction factor and slump tests, hardened properties namely compressive strength and split tensile strength at 7 days and 28 days are also determined. M20 grade concrete mix is proportioned as per IS: 10262-2009, all the alternatives have been tried, and test results for various combinations are compared. Key words: Sustainable concrete, Slag sand, Ground granulated blast-furnace slag, Strength studies. 1. INTRODUCTION Sustainability generally means having no negative impact on the environment. Green building refers to both a structure and processes that are environmentally responsible and resource-efficient throughout the building life cycle. Building materials typically considered as green includes products that are non- toxic, renewable, reusable, or recyclable. 900 kg of CO 2 are emitted for the production of every tonne of cement. Ground granulated blast-furnace slag (GGBFS) which is a waste from blast furnace in ironwork industry being used as an alternative to cement helps in effective utilization of industrial by-products which would otherwise end up in a landfill. Thus, saving land filling space and also reduces CO 2 emission thus lowering carbon footprint and greenhouse gas emission. A lot of damage has been caused to the ecosystem by carrying out dredging operations on the sand beds leading to depletion of ground water level, lowers stream bottom, threat to nearby structures such as bridges due to undermining effect which may go up to its depth of excavation, bank erosion, and also leads to destruction of aquatic life. The recent controversy in India over sand mining has put spotlight on the need to substitute the natural fine aggregates. Slag sand is being used as an alternative to fine aggregate which in turn leads to effective utilization of industrial by-products. 2. LITERATURE REVIEW In the work of Saxena et al. [1], the compressive strength was carried out on concrete cubes 150 mm size, with sand replaced by iron slag at 5 levels (0, 15, 30, 45, and 60%). Result shows that the iron slag added to the concrete has the greater strength than the plain concrete. • In the work of Quasrawi et al. [2], the slag is used as fine aggregate replacing the sand in the mixes partially or totally. Ratios of 0, 15, 30, 50, and 100 %are used. Best results are obtained for replacement ratios of 30-50% for tensile strength and 15-30% for compressive strength. • In the work of Kumar and Kumar [3], concrete M20 and M30 grades for 0, 25, 50, 75, and 100% replacement cubes were also prepared, respectively. Results show that blast furnace slag can be used as an alternative to natural sand up to 60-75% in mortar and concrete, respectively. 3. RESEARCH IMPORTANCE As per literature review being done there are a lot of works which are being carried out on the concrete properties using slag sand alone. In this work, the properties of concrete when GGBFS and slag sand are being used in combination are determined. Since there is environmental issue in India against sand mining from river beds, cost of the sand which is one of the prime material for construction as shooed up, keeping *Corresponding Author: E-mail: [email protected] Indian Journal of Advances in Chemical Science Available online at www.ijacskros.com Indian Journal of Advances in Chemical Science S1 (2016) 201-205
Effective Utilization of Slag Sand and Ground Granulated Blastfurnace Slag for the Production of Green and Sustainable Concrete
Apr 25, 2023
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