International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2015): 6.391 Volume 5 Issue 10, October 2016 www.ijsr.net Licensed Under Creative Commons Attribution CC BY Properties of Geopolymer Concrete Produced by Silica Fume and Ground-Granulated Blast-Furnace Slag Ahmed Mohmed Ahmed Blash 1 , Dr. T.V. S. Vara Lakshmi 2 1 Civil Engineering, University College of Engineering & Technology, Acharya Nagarjuna University India 2 Assistant Professor, Department of Civil Engineering, University College of Engineering & Technology, Acharya Nagarjuna University India Abstract: In the construction industry, the main production of Portland cement causes the emission of air pollutants which results in environmental pollution. Geopolymer Concrete (GPCs) is a one type class of concrete based on an inorganic alumino- silicate binder system compared to the hydrated calcium silicate binder system of concrete. It possesses the advantages of rapid strength gain, elimination of water curing, good mechanical and durability properties and is eco-friendly and sustainable alternative to Ordinary Portland Cement (OPC) based concrete. This paper presents, to investigate the compressive strength of the Geopolymer concrete produced by replacement of Ground-granulated blast-furnace slag (GGBS) with SF (Silica fume) by 0%,20%,40%,60%,80% and 100% , and its studies carried out in varying molarity. The alkaline liquids were used in this study for the geopolymerization are sodium hydroxide (NaOH) and sodium silicate (Soi 2 ). The geopolymer concrete specimens were tested for their compressive strength at the ages of 7, 14 and 28 days under two types of curing (water curing and room curing). Experimental investigations have been carried out on workability, the various mechanical properties of GPCs. Keywords: Geopolymer, Concrete, GGBS, SF, Sodium Silicate, Sodium hydroxide. 1. Introduction In the today‘s world, concrete plays an important role in the construction works like dams, buildings, roads etc. It is made with cement and other additives or aggregates are mixed. These additives are either natural or artificial, but the constant use of natural additives has lead to exhausting of this very important source. Thus the use of alternative aggregate is a natural step towards solving part of the depletion of natural aggregate and the alternative aggregate processed from waste materials would appear to be an even more good solution [1,2,3]. The search of the alternative material for concrete-making started much before more than half a century. The main objective of the reuse of material is to minimize the impact of human activities on the environment and the planet. Use of inorganic industrial by products in concrete-making will lead to sustainable concrete design. The industrial as well as other wastes such as copper slag, oil palm shells, wood waste ash, fly ash, granite sludge, cement kilns dust, steel chips, silica fume, rice husk ash etc. were used in concrete to improve the properties of concrete and to reduce the cost [5,6]. The production of Portland cement worldwide is increasing 9% annually. Portland cement (PC) production is under critical review due to high amount of carbondioxide gas released to the atmosphere and Portland cement is also one among the most energy-intensive construction material [17]. The current contribution of green house gas emission from Portland cement production is about 1.5 billion tonnes annually or about 7% of the total greenhouse gas emissions to the earth’s atmosphere. Today, the world is facing the environmental pollution as a major problem. But the production of cement means the production of pollution because of the emission of CO 2 during its production. On the other side the demand of concrete is increasing day by day for its ease of preparing and fabricating in all sorts of convenient shapes. So to overcome this problem, the concrete to be used should be environmental friendly [2]. To produce environmental friendly concrete, it is necessary to replace the cement with the industrial by products such as fly ash, GGBS etc. Disposal of FA is a growing problem, as only 15% of FA is currently used for high value addition applications like concrete and building blocks, the remaining being used for land filling. The SF increases the strength in case of hardened concrete. Another alternative but promising utility of SF in construction industry that has emerged in recent years is in Geopolymer concrete [3,4]. Geopolymer technology can be appropriate process technology utilize all classes and grades of SF and therefore there is a great potential for reducing stockpiles of waste SF materials. The present study considers SF utilization in production of geopolymer concrete since it can accommodate a major portion of the ash produced [7,8]. Geopolymer concretes’ (GPC) are a type of Inorganic polymer composites, to form a substantial element of an environmentally sustainable construction and building products industry by replacing/supplementing the conventional concretes. The term geopolymer was first introduced by Davidovits in 1970s to name the three- dimensional alumino-silicates material, which is a binder produced from the reaction of a source material or feedstock rich in silicon (Si) and aluminum (Al) with a concentrated alkaline solution [5]. The source materials may be industry waste products such as fly ash, slag, red mud, rice-husk ash Paper ID: ART20162136 319