Effect of different sizes of coarse aggregate on the properties of NCC and SCC

Self-Compacting concrete (SCC) needs no external vibration and compacts fully under its self weight. This paper describes experimental work carried out to develop SCC and to study the effect of different sizes (i.e., 20mm; 16mm; 12.5mm and 10mm) of coarse aggregate (C.A) on the properties of SCC. Eight mixes were investigated for M30 grade concrete. The water-powder ratio was kept fixed throughout the SCC mixes. The superplasticizer (S.P)(Structuro 100) and viscosity modifying admixture (V.M.A)(Structo 480) dosages was determined from mortar trails. To achieve self-compacting properties, successive replacement of C.A by fine aggregate was adapted. Slump flow test, V-funnel test, J-ring test and L-box test on fresh concrete were carried out as per EFNARC guidelines. The compressive strength, split tensile strength and flexural strength of the concrete after 7, 28 &56 days curing were also investigated. The test results showed how Self-Compacting properties were achieved as different sizes of C.A.