Abstract
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.
Highlights
Self-Compacting Concrete (SCC) is a highly flow-able concrete type that spreads and compacts into every corner of a formwork purely under the action of its own weight without the need for any form of mechanical vibration
The compositions of ordinary Portland cement, limestone powder and rice husk ash as shown in Table III revealed that calcium carbonate filler has an excellent binding properties comparable with that of cement
SCC design mixes of grade M60, M65 and M70 prepared with 10 mm and 20 mm coarse aggregates exhibited lower slump spreads than the SCC mix produced with 6.3 mm coarse aggregates
Summary
Self-Compacting Concrete (SCC) is a highly flow-able concrete type that spreads and compacts into every corner of a formwork purely under the action of its own weight without the need for any form of mechanical vibration. It was first developed in Japan in the year 1988 due to the drastic reduction in the number of skilled workers and site operatives that the Japanese construction industry experienced in the 1980’s [1]. In the preparation and mixing of SCC, it is necessary to make use of plasticizers (water reducers) so as to ensure high mobility of the concrete mix and to prevent segregation of the concrete mix. The resultant effect of the reduced water content in the concrete mix is increased strength and durability in the concrete
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