The Effect of Styrofoam Artificial Lightweight Aggregate (ALWA) on Compressive Strength of Self Compacting Concrete (SCC)

Self-compacting concrete (SCC) is a fresh concrete that is able to flow and fill up the formwork by itself without the need of a vibrator to compact it. One of the reasons that causes the damage of a building structure during an earthquake is the heavy weight of its structural members which are from the high density of the material used such concrete material. Lightweight aggregate is one of the solutions to reduce the weight of the structure. Therefore, the SCC using the artificial lightweight aggregate (ALWA) is one of the solutions to reduce the self-weight (dead load) of a structure. This research was conducted to investigate the impact of the use of ALWA in conventional concrete and SCC in terms of its compressive strength and modulus of elasticity. To study the impact of the use of ALWA in SCC, several variation of percentage of ALWA as a substitution to the natural coarse aggregate was examined. The proportions of ALWA as a replacement to the coarse aggregate were ۰%, ۱۵%, ۵۰%, and ۱۰۰%. The test specimens were the cylindrical concrete of ۲۰۰ mm in height and ۱۰۰ mm in diameter for both compressive strength and modulus of elasticity tests. The results of the compressive strength test indicated that the higher the percentage of ALWA used in SCC, the lower the compressive strength of the concrete. The addition of ALWA as a substitution to the natural coarse aggregate to conventional concrete and SCC was found optimum at ۱۵% replacement with the compressive strength of conventional concrete and SCC of ۲۱.۱۳ and ۲۸.۳۳ MPa, respectively. Whereas, the modulus of elasticity of the conventional concrete and SCC were found to be ۲۰,۸۴۳.۹۹ and ۲۳,۷۱۷.۷۷ MPa, respectively.

Keywords:

Artificial Lightweight Aggregate , Compressive Strength , Modulus of Elasticity , Self-Compacting Concrete , Styrofoam