In this research work, the effect of Calcium Carbonate Filler was studied on the compressive strength and the workability of self-compacting Concrete (SCC) at different grades (M60, M65 and M70) and different coarse aggregate sizes (6.3mm, 10mm and 20mm). Calcium Carbonate Filler (Limestone powder) and Rice Husk Ash (RHA) were added in percentages of 2.5% and 5% to check its effect on the workability and strength properties of SCC and Normally Vibrated Concrete. Experimental investigations were carried out on SCC and normally vibrated concrete (NVC) samples of grade M60, M65 and M70 using different aggregate sizes of 6.3mm, 10mm and 20mm. The workability test results obtained showed values within specification. The compressive and Tensile strengths for SCC (with powder and 2.5% RHA) are higher than that with powder and 5% RHA and NVC. Generally, the use of Calcium Carbonate Filler improved the strength and densities for SCC design mix and decreased its workability. It is concluded that the use of SCC with designed Fillers ratio and RHA (≤5%) will improve the strength properties of SCC.
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