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The aim of this study was to investigate the properties of concrete with waste paper ash (WPA) as cement replacing material. The chemical composition of WPA was reported, and Portland cement was partially replaced with 0%, 5%, 10%, 15%, and 20% of WPA to explore its effect on both fresh and hardened properties of C -25 concrete. The result of this study indicated that the chemical compositions of WPA were not classified as Pozzolanic material. Setting times of blended cement paste with WPA were lengthened and its consistency was also increased. The cement paste with replacement up to 10% showed a normal consistency within the standard range. The workability of concrete was tested immediately after preparing the concrete mix, whereas the compressive strength was tested after 7 and 28 days of curing. The results indicated that the workability of concrete containing WPA decreases as the WPA content increases. This study also revealed that there is a significant improvement in Bikila Meko Joshua Ighalo ABOUT THE AUTHORS Bikila Meko Kejela is a lecturer and a young researcher in the Department of construction technology and management at Wolkite University, Ethiopia. He has a Bachelor of Science in Construction Technology and Management and a Masters in Science in Construction Engineering and Management. His major research interest includes advanced concrete engineering, alternative construction material, and green construction project management. Joshua O. Ighalo obtained a Bachelor's Degree in Chemical Engineering (2015) from the

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