Cement concrete partially replaced with waste materials

Abstract

The study's objectives are to lower the amount of corncob sawdust waste materials and lower the price of concrete. The workability and compressive strength characteristics of varying percentages of corn cob ash, sawdust ash, and cement concrete, as well as the mixing ratios of 1:1:1.5:3, 1:1:1:2, and water-cement ratios of 0.5, which later increased to 0.6, were examined and compared. The effect of sawdust ash and corn cob ash on the workability of fresh concrete was evaluated using a slump test. Ninety concrete cubes of 150 x 150 x150 mmwere cast, with the weight percentages of corn cob ash and sawdust ash to Portland cement being varied by 0%, 10%, and 15%. The concrete cubes were put to the test at days 7, 14, 21, 28, and 56. The corncob and sawdustash were found to be good pozzolans. Concrete becomes less workable as the ashes content increases, as seen by the decline in the slump value as the CCA andSDAcontents increased. As the days of curing rose and decreased, the compressive strength of the concrete cubes increased. The greatest compressive strength was recorded at 56 days for 0% and 10% of CCA (M25) at 24.9 N/mm2 and 22.4 N/mm2, individually, and 24.9 N/mm2, 23.9 N/mm2 for SDA (M25).Although just 10% CCA andSDAsubstitution is necessary to provide the greatest benefit of strength improvement, it was concluded that using CCA andSDAas a partial substitute for cement in concrete will boost waste to wealth initiative, especially in plain concrete works and non-load bearing structures.