INNOVATIVE USE OF FINELY GRADED LIMESTONE FOR IMPROVING THE FRESH PROPERTIES OF SELF-CONSOLIDATING CONCRETE INCORPORATING UNTREATED RICE HUSK ASH
This research examines the potential for improving the properties of high-performance self-compacting concrete (SCC) by incorporating residual-unprocessed rice husk ash waste (RHA) using finely graded limestone (FL) of varying fineness levels (FL1, FL2, and FL3 have mean particle sizes of 4.05 mm, 9.02 mm, and 18.05 mm, respectively). FL was utilized as a type 1 ordinary Portland cement (OPC) substitute at concentrations of 20% and 40% by weight, and RHA was used as a fine aggregate replacement material at a concentration of 20% by weight. The SCC mixtures were designed with a controlled slump flow of 725 ± 25 mm. In this study, the workability in the fresh state and mechanical properties of the blends of OPC and FL were investigated using the slump flow time, V-funnel flow time, flow diameter from the J-ring test. The results show that the use of FL1, FL2, and FL3 can reduce the water content of the powder (OPC and FL). Remarkably, the resulting concretes maintain their slump flow, flow through a V-shaped box, and flow through the obstacles used to assess the J-ring test, thus satisfying the criterion declared by EFNARC. When FL is incorporated at 20–40% by weight, its rheological characteristics and compressive strength benefits become sufficiently significant and the inclusion of FL in SCC is both useful and practical.
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