Cementitious　and　recycled　materials　that　have　the　potential　to　improve　various　properties　of　concrete　have　attracted　the　attention　of　many　researchers　recently.　Different　types　of　cementitious　and　recycled　materials　seem　to　possess　certain　unique　properties　to　change　cement　concrete.　This　experimental　study　aims　to　investigate　the　impact　of　ground　granulated　blast　furnace　slag　(GGBFS)　and　corn　cob　ash　(CCA)　as　a　partial　replacement　material　for　Portland　cement　(PC)　and　fine　aggregate　(FA),　respectively,　on　fresh　and　hardened　concrete　properties,　as　well　as　the　embodied　carbon　of　concrete.　The　concrete　mix　was　blended　with　5-20%　of　GGBFS　and　10-40%　of　corn　cob　ash,　both　individually　and　combined.　A　total　of　300　concrete　specimens　were　made　to　achieve　the　targeted　strength　of　25　MPa　at　a　0.50　water/cement　ratio　and　cured　at　28　days.　It　is　observed　that　the　workability　of　fresh　concrete　is　lowered　as　the　dosages　of　GGBFS　and　CCA　increase　in　the　mixture.　Moreover,　the　compressive　and　split　tensile　strengths　are　augmented　by　10.94%　and　9.15%,　respectively,　at　10%　of　GGBFS　by　the　weight　of　PC　at　28　days.　Similarly,　the　compressive　and　split　tensile　strengths　are　augmented　by　11.62%　and　10.56%,　respectively,　at　30%　of　CCA　by　the　weight　of　FA　at　28　days.　Moreover,　the　combined　use　of　10%　of　GGBFS　as　a　cementitious　ingredient　along　with　30%　of　fine　aggregate　replaced　with　CCA　in　concrete　provides　the　highest　compressive　and　splitting　tensile　strength,　with　16.98%　and　13.38%　at　28　days,　respectively.　Furthermore,　the　density　and　water　absorption　of　concrete　were　reduced　with　increasing　dosages　of　GGBFS　and　FA　in　concrete　at　28　days.　In　addition,　the　embodied　carbon　and　energy　were　also　reduced　as　the　replacement　content　of　GGBFS　along　with　CCA　increased　in　concrete.　It　is　concluded　that　10%　of　GGBFS　and　30%　of　CCA　are　the　optimum　percentages　for　structural　applications　to　reduce　the　use　of　cement　as　well　as　the　cost　of　the　project.