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The findings of a study on concrete mix design using calcined clay pozzolona from (Lasjan) Pampore in Jammu and Kashmir (India) as a partial replacement for cement in structural applications are presented in this paper. Many scientific studies have looked into the impact of calcined clay on the strength qualities of typical Portland cement concrete. In our work, a part of cement is being replaced by calcined clay with 0 to 30% to form binder pastes and concrete. The M25grade concrete was prepared and compressive strength was investigated against the plain concrete. The various other testslike setting time tests and normal consistency tests were also implemented for blended concrete and compared with plain concrete. Concrete with calcined clay pozzolona as a partial replacement for cement had a long time to set. It also shows a drop in compressive strength growth at early periods like 7 and 28 days. However, when compared to plain concrete, the compressive strength increases dramatically after 28 days. This study recommends up to 20% replacement of cement in M25 grade concrete by calcined clay, for effective results in compressive strength. [ABSTRACT FROM AUTHOR]