Experimental Study on Cement and Fine Aggregate Replacement with Coal Bottom Ash in Seawater-Mixed Concrete

An experimental studywas carried out tostudy the properties of concrete madewith seawater as total mixing water, ground coal bottom ash binary cement and ashas sand replacement.The first stage mixes were prepared with three percentages (0, 10, 20 30) bottomash partial replacement binder.The second involved10 percent 25%,50%, 75% 100% replacing naturalsand. Properties investigated materials properties,binderchemical composition,concretehardened density,compressivestrength,and SEM. Test on hardened density was conductedon 7 28 days. Ground identified Class F, while has lowspecific high-waterabsorption compared to naturalsand.Concrete andcompressive strength decreased use fine aggregate. Compressive seen decrease CBA percentagerose, maximum value being 44.4 MPa for combination 10 25 ash.Series 10% (ground ash) reduces by roughly 51% maintaining a sufficient structural value.The findings this investigation showed that it is possible produce seawater-concrete, which incorporates ashin concrete.