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Saudi Journal of Civil Engineering (SJCE)
Volume-5 | Issue-07 | 183-191
Original Research Article
Statistical Evaluation of the Effect of Organic Admixture on the Mechanical Properties of Wood Shavings-Concrete for Building Construction
Akpokodje OI, Agbi GG, Uguru H
Published : Aug. 5, 2021
DOI : 10.36348/sjce.2021.v05i07.001
Abstract
The quest for green concrete is on the rise globally, due to the environmental hazards (emission of CO2 and particulate matters) usually associated with cement and coarse aggregate production. This study was carried to evaluate the possibility of enhancing the mechanical properties of wood shavings-concrete with cassava starch solution. Sets of concrete were produced with wood shavings at the rate of 1%, 1.5%, 2%, 2.5%, 3%, 3.5% and 4% (by weight of the coarse aggregate). 2% (by weight of the cement) dried cassava starch was employed as organic admixture during the concrete production. Conventional mix ratio of 1:2:4, and water to cement ratio (w/c) of 0.6 was also adopted for the concrete production. The slump of the fresh mortar, and the density, compressive and flexural strengths of the hardened concrete were tested in accordance to ASTM International procedures. Results obtained from the laboratory tests revealed that the wood savings had negative impact on the mechanical properties of the concrete. The compressive and flexural strengths of the concrete decreased, as the quantity of the wood shavings increased from 0% to 4%. When compared to the results obtained from concrete produced without cassava starch, it was observed the cassava starch enhanced the compressive and flexural strengths of the concrete produced. Regression analysis of the obtained results affirmed that wood shavings and cassava starch can influenced the mechanical properties of concrete, as concrete produced with cassava starch had higher a Pearson correlation coefficient, than the concrete produced without cassava starch. Results obtained from this study showed the feasibility of producing lightweight green concrete, by using low volume of wood shavings and cassava starch as admixture.
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