Title: Effect of maize cob ash as supplementary cementitious material on the mechanical properties of concrete

Authors: Orlando R. Bagcal; Melito A. Baccay

Addresses: Construction Science and Management, Department of Engineering Technology, Tarleton State University, St. Felix St., Box T0400, Stephenville, Texas, USA ' Civil Engineering Department, College of Engineering, Technological University of the Philippines, Ayala Blvd., San Marcelino St., Ermita, Manila, Philippines

Abstract: In this study, the effect of maize cob ash (MCA) as a supplementary cementitious material on the mechanical properties of concrete was evaluated. Maize cob ash as a pozzolanic material was partially used to replace cement ranging from 0% to 20% by weight in increment of 5% with varying water-cementitious ratios of 0.44 and 0.56. The results of this study indicated that the strength of concrete decreased as the amount of maize cob ash in the concrete mix increased. Generally, it can be concluded that maize cob ash can be utilised as partial replacement for cement in concrete at a suitable amount and can be used for building walls and other minor construction works. It was also established in the study that the optimum amount of 6.43% maize cob ash cement replacement could be used for structural members with compressive strength of 25 MPa.

Keywords: cement; cementitious materials; compressive strength; maize cob ash; MCA; mechanical properties; tensile strength; concrete.

DOI: 10.1504/IJMATEI.2019.10021332

International Journal of Materials Engineering Innovation, 2019 Vol.10 No.2, pp.83 - 97

Received: 23 Apr 2018
Accepted: 17 Jun 2018

Published online: 22 May 2019 *

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