The infrastructure of the country heavily depends on the construction material concrete. The primary ingredient in conventional concrete is cement, fly ash, or another cementitious substance. The need to explore alternative sources is driven by the challenges posed by global environmental warming, which stems from widespread factors, and the escalating costs associated with the extraction of cement from quarries. To replace cement, sand, and aggregate, numerous research investigations have been conducted. The Prosopis Juliflora Ash (PJA) as an additional cementitious component in cement mortar and concrete are examined in this experimental study. The amount of cement produced in the nation will decrease if Prosopis Juliflora (PJ) ash is used as an additional substitute. It will also encourage the use of sustainable materials for concrete and mortar. The objective of this research is to investigate the impact of incorporating PJA as a binding agent on the compressive strength, split tensile strength, and flexural strength of both concrete and cement mortar. In this research, Prosopis Juliflora Ash (commonly known as Seemaikaruvelam) was employed to substitute cement in both cement mortar and concrete, with varying proportions of 10%, 20%, 30%, 40%, and 50%.According to the results of this experiment, 30% of PJA has the requisite strength qualities. This experimental investigation provides valuable insights into the mechanical characteristics of concrete and mortar incorporating PJ ash and emphasizes its potential as a sustainable alternative in the construction industry.