Experimental Investigation of the Effect of Partial Replacement of Cement with Eggshell Ash on the Rheological Properties of Concrete

Afolayan J. O.

This research presents the experimental results of the effect of eggshell ash as a partial replacement of cement in concrete. The properties of concrete investigated include the compressive strength, workability and the setting time. The cement in the concrete mix were partially replaced with egg ash at varying percentages which includes 0%, 5%, 10%, 15%, 20%, 25% and 30% using a mix ratio of 1:2:4 and a constant water cement ratio of 0.55. The specimen produced for the various percentages of eggshell ash were cured for 7, 14, 21 and 28 days before carrying out the compressive strength test. The average compressive strength at  28days of curing for   5%, 10%, 15%, 20%, 25% and 30% are 31N/mm2 , 30N/mm2, 27N/mm2, 24N/mm2, 19N/mm2 and 15N/mm2 respectively. The results shows that increase in the percentage of Egg shell ash leads to decrease in the compressive strength. However at 15% replacement the compressive strength is 27N/mm2, which satisfied the require strength for grade 25 concrete in BS 8110.