EFFECT OF DIFFERENT TYPES OF LIGHTWEIGHT AGGREGATE ON STRENGTH AND MODULUS OF ELASTICITY OF CELLULAR CONCRETE

الملخص

The objective of this study is to improve the properties of structural foamed concretes by adding fine and coarse lightweight aggregate. The materials that used in this study were fly ash as fine material and various types of lightweight aggregate (Leca, porcelanite). The mechanical properties included fresh and hardened density, compressive strength and elasticity modulus were tested in this study. The results show increases in compressive strength and modulus of elasticity by increasing the percentage of fine aggregate (fly ash). The optimum percent is 50% for fine aggregate (fly ash). The compressive strength decreases with increasing the percentage of lightweight coarse aggregate. The modules of elasticity increase by increasing the replacement percentage of fly ash. The addition of lightweight coarse and fine aggregate effect on the percentage of foam needs to be added to the mix for the desired density. Type of aggregate has a significant effect on compressive strength and modulus of elasticity for foamed concrete. Flyash increased compressive strength by about (39%). Lightweight aggregate decrease in compressive strength about (2-50) %. Flyash increase in modulus of elasticity about (10-56)% and lightweight aggregate increase in modulus of elasticity about (1-20)%. Fly ash and lightweight aggregate (Leca and Porcelanite) improved the properties of foamed concrete.