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Evaluation of the Properties of Lightweight Concrete Using Periwinkle Shells as a Partial Replacement for Coarse Aggregate
OYEDEPO, OLUGBENGA JOSEPH
Abstract
The properties of lightweight concrete, such as aggregate impact value,
aggregate crushing value and compressive strength were assessed utilizing periwinkle shell
(PWS) as partial replacement for coarse aggregate. Standard mix of 1:2:4 with varying
percentages of 0%, 10%, 20%, 30%, 40%, 50% and 100% partial replacement of PWS using
water/cement (W/C) ratio of 0.55 was used. Seventy two cubes of 150 mm x 150 mm x 150
mm were casted; allowed to set for 24 hours before remolding, and were properly cured. The
strength characteristics of each cube were evaluated using Compressive Testing machine at
the curing ages of 7, 14, 21 and 28 days. The ACV and AIV obtained are 31.59% and 22.61%
respectively which is within the acceptable limit. An optimum compressive strength value of
16.79 N/mm2 and 16.71 N/mm2was obtained with the addition 20% and 30% partial
replacement of coarse aggregate with PWS in 28 days. These values are within 15-25
N/mm2and it is suitable for Lightweight concrete. The research demonstrates that the
utilization of PWS in structural/insulating lightweight concrete, at lower volume of
replacement, will reduce the utilization of granite in concrete. Thus, decreasing the production
cost of concrete and the ecological contamination brought about by the dumping of periwinkle
shell.© JASEM
Keywords
Lightweight Concrete; Periwinkle; Aggregate Impact Value; Aggregate Crushing Value; Compressive Strength; Environmental Pollution
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