International Journal of Latest Research in Engineering and Technology (IJLRET) ISSN: 2454-5031 www.ijlret.com || Volume 03 - Issue 01 || January 2017 || PP. 01-14 www.ijlret.com 1 | Page SELF COMPACTING CONCRETE WITH SLAG AS COARSE AGGREGATE Dr. G.C. BEHERA* a , RANJAN KUMAR BEHERA b , a prof. & Head, Civil Engineering Department, Gandhi Engineering College, Bbsr,752054, India b asst. Prof. Civil Engineering Department, Bhadrak Institute Of Engineering And Technology, Bhadrak-756113, Odisha, India Abstract: Self compacting concrete requires no external or internal compaction as it is leveled and compacted under its own weight. Self compacting concrete is highly engineered concrete with much higher fluidity without segregation and bleeding. The three main requirement of self compacting concrete are filling ability, passing ability and resistance to segregation. Plenty of availability natural resources in the past have become a dream for present day engineering society due to large scale consumptions. To overcome the problem of scarcity of natural aggregates and to save the environment from the pollution of dumping, civil engineers opined that there is significance potential for reuse of slag in value added application to maximize economic and environment benefit. Here an attempt has been made in this investigation to determine the strength characteristics of slag for application in self compacting concrete (SCC). It is found that ACI-1985 predicts closely to the test values while the others overestimate in 7 days test. The predicated values by Yun Wang Choi (2004) and Hueste et al (2004) overestimate while ACI-1985, ACI- 1992, and ACI-1995 underestimate the test results in 28 days. Flexural strength is found to be increasing with increasing in the percentage of slag. ACI-1992,overestimate the values, IS-456-2000 and ACI-1985 well predicts the test values while Foster F Z-1995 underestimates the values. 1.0 Introduction: Development of new technology in the field of material science is progressing rapidly. In last three decades, a lot of research has been carried out throughout the globe to improve the performance of concrete in terms of strength and durability qualities. Consequently concrete has no longer remained a construction material consisting of cement, aggregate, and water only, but has becomes an engineered custom tailored material with several new constituents to meet the specific needs of construction industry. The growing use of concrete in special architectural configurations and closely spaced reinforcing bars have made it very important to produce concrete that ensures proper filling ability, good structural performance and adequate durability. In recent years, a lot of research was carried out throughout the world to improve the performance of concrete in terms of its most important properties, i.e. strength and durability. Concrete technology has under gone from macro to micro level study in the enhancement of strength and durability properties from 1980‟s onwards. Till 1980 the research was focused only to flow ability of concrete, so as to enhance the strength however durability did not draw lot of attention of the concrete technologists. This type of study has resulted in the development of self compacting concrete (SCC), a much needed revolution in concrete industry. Self compacting concrete is highly engineered concrete with much higher fluidity without segregation and is capable of filling every corner of form work under its self weight only (Okamura 1999) [1] . Thus SCC eliminates the needs of vibration either external or internal for the compaction of the concrete without compromising its engineering properties. For several years, the problem of the durability of concrete structures has been a major problem posed to engineers. To make durable concrete structures, sufficient compaction is required. Compaction for conventional concrete is done by vibrating. Over vibration can easily cause segregation. In conventional concrete, it is difficult to ensure uniform material quality and good density in heavily reinforced locations. If steel is not properly surrounded by concrete it leads to durability problems. This is the problem mainly with heavily reinforced sections where a very high congestion of reinforcement is seen. In this case, it becomes extremely difficult to compact the concrete. Then what can be done to avoid honeycombing? The answer to the problem may be a type of concrete which can get compacted into every corner of form work and gap between steel, purely by means of its own weight and without the need for compaction. This is the concept behind self compacting concrete(SCC). The SCC is an engineered material consisting of cement, aggregates, water and admixtures with several new constituents like colloidal silica, pozzolanic materials, and chemical admixtures to take care of specific requirements, such as, high-flow ability, compressive strength, high workability, enhanced resistances to chemical or mechanical stresses, lower permeability, durability, resistance