keywords: Analysis of variance, crude oil,periwinkle shell ash, potable water
The present study investigated the compressive strength of periwinkle shell ash (PSA) blended cement concrete soaked in crude oil polluted water and portable water (control) media. Concrete cubes were prepared at 1:2:4 mix ratio by weight of cement with varying percentages of PSA replacement (0, 5, 10, 15 and 20%). Specimens were prepared from mix designed strength of 25 N/mm2. One hundred and twenty (120) samples of concrete cubes were cast. Sixty (60) set of samples were each cured in potable water and crude oil contaminated water. The concrete cubes were crushed for compressive strength at curing ages of 7, 14, 21 and 28 days, respectively. The results indicated that different curing media led to significant changes in the compressive strengths of concrete made from PSA blended with Ordinary Portland Cement (OPC). The control specimen (0% PSA) had the highest value at all ages in both media. The rate of strength development is significantly low in the crude oil contaminated water medium. The compressive strength decreased with increased percentage PSA replacement and increased with increasing age of curing for all level of PSA replacement. The two way analysis of variance showed that variations in PSA/cement content and curing age had significant effects on the compressive strength of concrete for samples cured in both control (portable water) and crude oil polluted water media (p < 0.05).
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