BEHAVIOUR OF SELF COMPACTING CONCRETE USING MANUFACTURED SAND AND FLYASH

Abstract

The main objective of this study is to explore the possibility of using Manufactured Sand (MS) and Flyash in Self Compacting Concrete(SCC). It investigates the making of SCC more affordable for the construction market by replacing high volumes of Portland cement by Fly ash & Natural Sand (NS) by Manufactured Sand. Six SCC mixtures were investigated in this study (i.e., 100%MS, 100%NS, 50%MS+50%NS for 30% flyash replacement and 100%MS, 100%NS, 50%MS+50%NS for 40% flyash replacement). The content of the cementitious materials was maintained constant (450 kg/m3), and the water/cementitious material ratios 0.4. The self-compacting mixtures had a cement replacement of 30% & 40% by fly ash. Tests were carried out on all mixtures to obtain the properties of fresh properties such as Slump flow, V-funnel, L-box and J-ring and hardened properties such as Compressive strength, Flexural strength and Split tensile strength. The SCC developed a 28-day compressive strengths ranging from 33.81 to 43.70 MPa. The results of the fresh properties of the mixes have shown that the use of MS gives good flow when compared to NS & the consumption of admixture for NS is more when compared to the use of MS and the results of the hardened properties of the mixes have shown that concrete mixes with partial proportions of MS and NS (i.e., 50%MS+50%NS) achieved a higher compressive strength at all test ages when compared to MS and NS alone.