This research books gives information about Eco-friendly mortar. In any construction, brick masonry is very much of used to make a walling units and in that cement mortar is one of the important ingredients. It makes up as little as 7% of total volume of brick masonry. Also, it prevent moisture and air penetration. The aim of this research is to replace the cement by carbon black powder in the proportion of 0%, 5%, 10%, 15%, 20%, 25% and 30% by weight. The compression strength test is carried out to evaluate the mechanical properties for 7, 14 and 28 days. Water absorption test, Spilt tensile strength test, Durability test are carried out to evaluate the properties for 28, 28 and 56 days respectively. As a result, this research work is concerned with the experimental investigation on strength of mortar and optimum percentage of the partial replacement by replacing cement via 0%, 5%, 10%, 15%, 20%, 25% and 30%. Keeping all this view, the aim of the investigation is the behavior of mortar while replacing cement with different proportions of carbon black powder by the optimum percentage of replacement.