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Ogbonna, C.
Department of Civil Engineering, Michael Okpara University of Agriculture, Umudike, P. M. B. 7267, Umuahia 440109, Abia State, Nigeria
Mbadike, E. M.
Department of Civil Engineering, Michael Okpara University of Agriculture, Umudike, P. M. B. 7267, Umuahia 440109, Abia State, Nigeria
Alaneme, G. U.
Department of Civil Engineering, Michael Okpara University of Agriculture, Umudike, P. M. B. 7267, Umuahia 440109, Abia State, Nigeria
ABSTRACT
The
frequent and incessant utilization of cement in construction-works has led to
environmental degradation through emission of oxides-of-carbon during its
production and usage. In this research, the use and characterization of
cassava-peel-ash (CPA) as admixture for concrete production were assessed with
the cementitious portion of the concrete mixture replaced partially with
proportions between 0% and 40% to reduce the quantity of cement consumption for
construction works. The durability and mechanical strength properties were
assessed for the varying replacement ratios compared with the control sample
and also at varying curing period from 3-days to 90-days to validate the effect
of pozzolanic-reaction at prolonged hydration stages in concrete. From the
experimental results, there were rise in percentage difference for the concrete
results with CPA replacements (5-40%) from 3.40-31.59%, 4.03-31.52%,
9.14-25.42%, 1.724-12.44% and 1.89-7.80% for 3, 7, 28, 60 and 90 days hydration
period respectively. These results indicate the gradual decrease in percentage
difference for the prolonged hydration period compared to the blended concrete
samples at initial stages of hydration which signifies the pozzolanic reaction
effect in mechanical strength development of CPA concrete. Statistical
computation was carried out on the derived experimental data using ANOVA and
Dunnett post-hoc test to determine the level-of-significant difference so as to
derive the optimum mixture combination for the cement-CPA blend with respect to
the control group results. From the statistical result, minimum
difference-of-means of -718 was obtained for 5%-replacement group while the
maximum difference-of-means of -4691 was obtained for 40%-replacement group to
validate the experimental findings which present the cement-CPA concrete’s
mechanical behaviour for construction purposes.
Keywords: Concrete Durability Property; Modulus of Elasticity; Pozzolan; Modulus of Rigidity; Supplementary Cementitious Materials.
https://doi.org/10.33922/j.ujet_v6i2_8
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Published
Friday, January 22, 2021
Issue
Vol. 6 No. 2, December 2020
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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