SUITABILITILTY OF SESAME PLANT POWDER AND METAKAOLIN ON THE STRENGTH PROPERTIES OF SELF CURING CONCRETE 1
Abstract
Self-curing concrete offers a promising alternative by maintaining internal moisture for hydration without external curing, thereby achieving the required performance. Therefore, in this study, sesame plant powder (SPP) is obtained from fresh Sesamum indicum plants, dried, ground with a ball grinder, and sieved through a 150-micron sieve, while metakaolin (MTK) is obtained from Kaolin, calcined at 800 °C, sieved through a 150-micron sieve, and used as a partial replacement for cement. Results from the laboratory show that SPP has 27.60% SiO2, 4.15% Al2O3, 2.50% Fe2O3, and loss of ignition 58.0%, while MTK has SiO2 48.92%, Al2O3 43.46%, Fe2O3 0.51%,> 70%, and LOI 1.69%. Fine aggregates (FA) and coarse aggregates (CA) have fineness modulus of 2.01 and 6.55, respectively. Specific gravities FA is 2.67, CA is 2.68, for SPP is 2.18, and that for MTK 2.61. Cement was partially replaced with 0%, 10.5%, 11%, and 11.5% by weight of SPP and MTK, which are Control (C), R1, R2 and R3. The setting time and consistency for 0% to 11.5% mixes are initially 47min to 55min, and the final setting time was 262min to 302min, with consistencies of 27% to 30%. The slump test workability was low, while the compaction factor test result was 0.92 to 0.90. A 1:2:4 concrete mix by weight was used to produce 100x100x100mm cubes and 100x100x500mm beams; they were externally and self-cured at 7, 14, 28, 56, and 90 days. Results revealed that control concrete had the highest density and showed a steady increase in compressive strength from 19.09N/mm2 at day 7 to 34.80N/mm2 at 90 days, but R1 surpassed C at 90 days, with 35.01N/mm2. R1 has the optimum flexural strength of 10.25N/mm2 and at age 90. Therefore, optimum performance was observed at 0.5% SPP and 10% MTK. It enhances self-curing and promotes sustainable construction practices, providing a cost-effective solution for concrete production in arid and water-scarce sub-Saharan regions.
KEYWORDS: Compressive Strength, Metakaolin, Self-curing concrete, Sesame Plant Powder, Sustainable construction.
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