Investigating the influence of con-cob ash as a partial replacement of cement in pavers
Angura, Derrick Steven
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Agricultural wastes are dumped in landfills or left on land which constitutes a nuisance. This study presents the results of the investigation of Corn Cob (agricultural waste) Ash (CCA) as a partial replacement of cement in paver blocks. Using varying percentages of 0%, 15%, 20%, and 25% with curing days of 7, 14 ,and 28 days. The mix proportion of 1:2:3 of a mold size of 200x100x80mm. from the results, corn cob Ash is can be said to be a pozzolan of class F based on chemical composition, due to the physical properties of corn cob ash it was found that it can be used as supplementary cementitious material. The results show that density decreased as the percentage of CCA increased in the paver blocks. This may be because OPC has a higher specific gravity (3.15) than CCA (2.15). The water absorption decreased with an increase in the CCA content and increased with an increase in the curing period. The lowest value of water absorption was obtained for the paver blocks containing 25% CCA which provided 7.1% and 7.3% water absorption at 7 days. From the results, it can be seen that paver blocks with 0% CCA content had the highest compressive strength because the cement proportion was the highest. In addition, the results showed that for the same age of the paver blocks, compressive strength decreased as the percentage of CCA/OPC content increased.