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Following a 25-1 fractional factorial design concept, an experiment was planned ; sixteen experimental mixes were calculated from a basic mix (cement : sand : aggregates : fly ash = 1 : 1.3 : 2.6 : 0.8 and W/C ratio of 0.37) and determined changes (cement = 0.1 ; sand = 0.1 ; aggregates = 0.2 ; fly ash = 0.04 and changing W/C ratio by 0.01) using Taguchi's orthogonal array. Samples were made from each data point. Compressive strength and water absorption were determined after each of two curingdoaj:7ebaec3a1b6246f8aa7b447e7da2aaff fatcat:w6kye6qbu5gcbl6kxppkifxhmm