eng Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 2021-12-09 9 6 212 218 10.12691/ajcea-9-6-1 AJCEA2021961 article Ikechukwu Ezegbunem ik.iykeson@gmail.com 1 Adewale Olutaiwo 1 Bola Mudasiru 2 Moshood Seriki 3 Adebayo Olayemi 4 Department of Civil and Environmental Engineering, University of Lagos, Akoka, Lagos, Nigeria Department of Civil Engineering, Federal University of Agriculture, Abeokuta, Ogun State, Nigeria Civil Engineering Department, Lagos State Public Works Corporation, Nigeria Civil Engineering Department, Federal Airport Authority of Nigeria This experimental study focused on exploring the potential utilization of rubbercrete for construction purposes by improving its workability and mechanical properties using agriculturally based supplementary cementing materials- rice husk ash, snail shell powder, pulverized cow bone and cow bone ash. Fine aggregate (sand) was partially replaced by waste crumb rubber at 0%, 5%, 10%, 15% and 20%. These agriculturally based supplementary cementing materials were included in the concrete mix as admixtures at 0%, 1% and 2% of Portland cement. Tests such as slump test; 28th, 90th and 120th day compressive strength; as well as the 7th and 28th day flexural strength tests were conducted on fresh and hardened concrete to investigate the workability and structural performance of the modified concrete. Mix proportion of 1: 0.9: 2.8 and water-cement ratio of 0.35 for a characteristic strength of 40N/mm2 was adopted for this study. The test results obtained revealed that the addition of snail shell powder, pulverized cow bone and cow bone ash improved the unsatisfactory compressive strength of rubbercrete significantly at 28days and at 2% inclusion. http://pubs.sciepub.com/ajcea/9/6/1/ajcea-9-6-1.pdf agricultural wastes crumb rubber mechanical properties rubbercrete supplementary cementing materials