A review on Self Compacting Concrete

Abstract

Self-compacting concrete (SCC), which flows under its own weight and doesn’t require any external vibration for compaction, has revolutionized concrete placement. Such concrete should have relatively low yield value to ensure high flow ability, a moderate viscosity to resists segregation and bleeding and must maintain its homogeneity during transportation, placing and curing to ensure adequate structural performance and long term durability. Self-compacting concrete (SCC) can be defined as a fresh concrete which possesses superior flow ability under maintained stability (i.e. no segregation) thus allowing self-compaction that is, material consolidation without addition of energy. Self-compacting concrete is a fluid mixture suitable for placing in structures with Congested reinforcement without vibration and it helps in achieving higher quality of surface finishes. Self-Compacting Concrete (SCC) is a modern concrete technology that allows significant advantages compared to conventional concrete. Extreme workability, self-compaction without vibration combined with high concrete quality allows new and interesting applications for the competitive users and creative specifies of concrete. The advantages of SCC are important for the applicators (contractors) and concrete producers (Ready mixed concrete, Precast well as for the final users of the structure. Knowledge about its properties, design and production is essential for the successful use of SCC. Creativity is also necessary, because the use of this technology is just starting to spread and new, interesting applications for SCC are found every day. This paper will give some information about the advantages of SCC, typical applications, influence on the cost, technical properties, test methods and creating a typical mix design. Another focus is a selection of case studies which shows a variety of projects where SCC has been used successfully. As can be seen, advantageous applications for SCC are very diverse, the reasons for using SCC can be very different.

KEYWORDS: Self Compacting Concrete; Flyash; Workability; Plasticizer.