PALM KERNEL HUSK ASH (PKHA) AS AN ADMIXTURE (ACCELERATOR) IN CONCRETE
DOI:
https://doi.org/10.4314/njt.303.21Keywords:
palm kernel husk ash, admixture, accelerator, cement, compressive strength, setting time.Abstract
Almost all admixtures used in concrete production in Nigeria are imported. This study was carried out to determine the suitability of PKHA as an admixture, while still retaining the compressive strength characteristics. Results revealed that the setting time of the mixture of the PKHA and cement cube decreases as the percentage of the PKHA increases as compared to the setting time of pure cement cube which was the control test. Also, the cubes obtained by mixing various percentages of the PKHA and cement showed reduced compressive strength for the 7 and 28 days compressive strength tests respectively relative to those made with 100% Ordinary Portland Cement (OPC) which also served as the control test. The main contribution of this technical paper is that PKHA can reduce the setting time of concrete to the detriment of the strength. There was no appreciable change in color in the cubes produced from the mixtures of palm kernel husk ash and cement compared to the pure cement cube.
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