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Chimmaobi, O.
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
In
this research study, cassava peel ash (CPA) which is an agricultural/industrial waste was
incorporated in the concrete mixture as a supplementary cementitious material
(SCM) thereby encouraging recycling and reuse of solid waste derivatives in
construction works to achieve sustainable engineered infrastructural
development and eco-efficient environment. The cementitious portion of the
concrete mix were partially replaced by varying proportions of CPA ranging from
0-40% while tests were carried out on the concrete samples at fresh and
hardened state to derive its workability, setting time, compressive and
flexural strength behavior. The concrete’s mechanical strength was determined
at hydration periods of 3, 7, 28, 60 and 90days respectively; to produce a
concrete mixture of coarse and fine aggregates, water, cement and CPA. The
physicochemical properties of CPA were obtained so as to characterize the
elemental chemical composition the admixture and the results indicated a good
pozzolanic behavior with Al2O3
+ SiO2 + Fe2O3 summing to 81.83 %. The
mechanical strength test results indicate rise in percentage
difference as CPA replacement ratio increased from 5-40% with a score of
7.2-46.2% and 18.18-86.19% for the compressive and flexural strength property
respectively. Similarly, the workability and setting time test result showed
increase in percentage difference as CPA replacement ratio increased from 5-40%
with a score of 17.08-54.2%,
5.6-81.14%
and 0.84-28.57% for slump, initial and final setting time properties
respectively. Furthermore, the concrete’s mechanical properties were observed
to increase generally with relative increase in the concrete hydration period.
The pozzolanic-activity-index (PAI) of CPA is 75.8% which is an indication that
it has high pozzolanic properties. From the results, the optimum combination
level of 5-10% replacement of the cement by CPA can be used to produce a better
and more desirable concrete. Correlation analysis were deployed to
statistically assess the mechanical properties response with the control
results; the analysis
results showed a consistent decrease in the correlation value from
0.9988-0.9678 and 0.9942-0.97594 for 5-40% replacement of the cement by CPA for the compressive
and flexural strength respectively.
Keywords: Concrete Compressive Strength; Concrete Flexural Strength; Supplementary Cementitious Materials; Cassava-Peel-Ash
https://doi.org/10.33922/j.ujet_v6i2_2
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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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