As the world urbanizes and industrializes, the demand for infrastructure development continues to rise, with concrete being the primary construction material globally. Since cement is the main component of concrete, its production has also increased. However, cement manufacturing poses significant environmental concerns, primarily carbon emissions. The cement mortar serves as the binding component in concrete and incorporating supplementary cementitious materials can help mitigate these issues. By adopting this approach, we can promote sustainable development in cities and communities, aligning with global efforts to reduce environmental footprint. Supplementary cementitious material such as RHA and Alcofine are used as binary and ternary blender in this paper. The mortar composition is optimized using a combination of alccofine and rice husk ash as supplementary cementitious materials, along with a natural aggregate by varying the waterbinder ratio by 0.4, 0.38 and 0.36 and to predict the compressive strength of the mix using mathematical modelling and machine learning algorithm. The objectives of this study are to investigate the effects of RHA and alccofine on the compressive strength. The research design involves a combination of experimental and analytical methods. It is expected that the results of this study will contribute to the development of sustainable and environmentally friendly construction materials. This project demonstrates the potential of sustainable mortar in reducing the environmental impact of the construction for achieving sustainable cities and communities (SDG 11).