PERFORMANCE OF SELF COMPACTING CONCRETE IN REINFORCED COLUMNS

Abstract

With the increasing use of self compacting concrete (SCC) in the construction field, it is necessary to study the performance of self compacting concrete in reinforced concrete columns. The purpose of this study is to compare the behavior of self-compacting concrete with same strength of normal vibrated concrete in columns and to study the effect of the various confinement parameters on self-compacting concrete reinforced columns. The parameters of the study were self-compacting concrete vs normal concrete, grade of concrete, longitudinal reinforcement, arrangement of reinforcement, yield strength of transverse reinforcement. The study included measuring load carrying capacity, gain in strength, ductility, stress strain curves and tie strain of confined SCC columns. The experimental programme consisted of casting 48 rectangular short column specimens of size 150mmx 15Omm>700 mm, that included plain and reinforced specimens. Two different configurations of transverse reinforcement were used. In one configuration, 4-120 bars were placed & the other arrangement consisted of 4-10I and 4-8D bars. Transverse reinforcement of 6 mm dia. of mild steel and of high yield strength was used. The pitch of transverse reinforcement was varied from 50 to 150 mm to impart high and low confinements. It was observed 8 bar configuration is more effective. than normal 4 bar configuration. The high yield strength can generate a high degree of confinement and gives, higher percentage' strength gain and ductility. The increase in grade of concrete for SCC, found to impart high/ strength and ductility. Hence, the overall performance of SCC. is much better than NC.