The effective utilization of secondary products obtained from coal ash is a major focus of researchers, addressing the global issue of ash dumping on the ground. Cenospheres are a novel material, inherently possessing significant physical and chemical properties that pave the way for numerous future technological advancements in construction. In present work cement is replaced by cenosphere with 2.5%, 5%, 7.5% and 10% to examine physical and mechanical properties of concrete. Because of the fineness of the cenosphere, concrete exhibits little gain in strength, but subsequently because of the lower quantity of calcium contained in the cenosphere, it loses strength substantially. For greater improvement in mechanical properties, calcium lactate of 0.010 mol/lit and 0.015 mol/lit is added in concrete mix along with cement replaced by cenosphere. The obtained result shows that, there is a 4.69% and a 4.80% drop in density when cenosphere is used to replace 10% of cement. Additionally, it results in increases in compressive strength of 4.09% and 8.40%, flexural strength of 2.86% and 6.34%, and tensile strength of 4.02% and 9.77%.