_____________________________________________________________________________________________________ *Corresponding author: Email: Ekboateng1@gmail.com; J. Eng. Res. Rep., vol. 24, no. 8, pp. 1-11, 2023 Journal of Engineering Research and Reports Volume 24, Issue 8, Page 1-11, 2023; Article no.JERR.97513 ISSN: 2582-2926 The Effect of Using Waste Automobile Tires and Palm Kernel Shells as Coarse Aggregates in Concrete on Tensile Strength and Failure Modes Eric Boateng a* , Charles K. Kankam b , Anthony K. Danso a , Joshua Ayarkwa a and Alex Acheampong a a Department of Construction Technology and Management, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana. b Department of Civil Engineering, KNUST, Kumasi, Ghana. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JERR/2023/v24i8833 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/97513 Received: 08/01/2023 Accepted: 12/03/2023 Published: 16/03/2023 ABSTRACT The use of waste materials as aggregates in concrete is hailed by many as a huge step towards addressing the overreliance on granite stones as aggregate in concrete. It also offers a strategic eco-friendly means of disposing these wastes to minimize their impacts on the environment. This study assessed the tensile strength and modes of failure of concrete that utilizes waste automobile tire chips and palm kernel shells (PKS) as partial to full replacement of the conventional crushed granite stones as coarse aggregates in concrete. Portland cement concrete with the mix ratio: 1: 1.5: 2.5 (cement: sand: granite coarse aggregate) based on the mass of the constitient materials was prepared as control from which twenty additional mixes were generated by replacing portions of the granite stones with PKS and tire aggregates while the sand and w/c ratio were kept constant. Original Research Article