www.ijraset.com Volume 3 Issue V, May 2015 IC Value: 13.98 ISSN: 2321-9653 International Journal for Research in Applied Science & Engineering Technology (IJRASET) © IJRASET 2015: All Rights are Reserved 487 Experimental Investigation on Elastic Properties of Concrete Incorporating GGBFS .Vijayalaxmi D.B 1 , Ajay H. A. 2 , Ranjith A. 3 , Sandya D. S. 4 1,2 P.G. Student, 3,4 Assistant Professor 1,2,3,4 Department of Civil Engineering, Adi Chunchanagiri Institute of Technology, Chikmagalur, Karnataka Abstract - Concrete is the most widely used man made construction material in the construction field all over the world. Concrete is made up of fine aggregates, coarse aggregate, cement and water for hydration of cement. Fine aggregates and coarse aggregates acts as filler material and cement acts as binding agent in concrete. In concrete cement plays a very important role in gaining strength but the major problem by the production of cement is liberation of large amount of CO 2 (green-house gasses) which is very dangerous to the environment. According to many researchers, the best way to overcome this problem is to use optimum amount of cement and its maximum replacement by pozzolana or cementitious materials such as fly ash, GGBFS (Ground granulated blast furnace slag), metakaolin etc. In the present work GGBFS is used as replacement material. The optimum replacement of GGBFS with cement is characterized by high compressive strength, low heat of hydration, resistance to chemical attack, better workability, good durability and cost-effectiveness. Also, an attempt has been made in predicting the elastic properties of GGBFS concrete as per various design standards and new relationships has been proposed. Keywords: Ground granulated Blast furnace slag (GGBFS), modulus of elasticity, modulus of rupture, super-plasticizer and sustainability. I. INTRODUCTION Concrete is the most widely used man made construction material in the construction world. Concrete is made up of fine aggregates, coarse aggregates, cement and water for hydration of cement. Fine aggregates and coarse aggregates acts as filler material and cement acts as a binding agent in concrete. In concrete cement plays a very important role in gaining the strength, but the major problem by the production of cement is the liberation of large amount of CO 2 (green-house gasses) which is very dangerous to the environment. According to many researchers, the best way to overcome this problem is to use optimum amount of cement and its maximum replacement by pozzolana or cementitious materials such as fly ash, GGBFS, metakaoiln etc. In the present work GGBFS is used as a replacement material. The optimum replacement of GGBFS with cement is characterized by high compressive strength, low heat of hydration, resistance to chemical attack, better workability, good durability and cost-effectiveness [5]. The continuous hydration of un hydrated cement components to form more hydration products in addition to the reaction of GGBS with the liberated lime to form more C-S-H leading to increasing compressive strength[6,7]. The modulus of elasticity, modulus of rupture and compressive strength are very crucial properties of concrete, these are the basic parameters essential for estimating deflection in reinforced concrete structures. Design codes of various countries have derived empirical relations between elastic modulus, modulus of rupture and compressive strength of concrete at 28 days [9, 10, 11, 12, and 13]. In the present case an attempt has been made to study the design codes of various countries and establishing new relations. The Indian code of practice (IS: 456) recommends the empirical relation between the modulus of elasticity and cube compressive strength of concrete as follows: E C = 5000 √f c The American code defines the relationship between modulus of elasticity and cylinder compressive strength for calculating deflection as follows: E C = 4734 √f c’ The New Zealand code defines the relationship between modulus of elasticity and cylinder compressive strength for calculating deflection as follows: E C =4734 (√f c’ + 6900) The euro code recommends the empirical relation between the modulus of elasticity and cylinder compressive strength of concrete as follows: E C =9500 (√f c’ + 8) 0.33 The british code of practice (BS-8110) recommends the empirical relation between the modulus of elasticity and cube compressive strength of concrete as follows: