<![CDATA[Mortar is one of the construction materials that plays an important role in various building applications.. The increasing use of cement has caused a number of problems, such as high energy consumption and carbon dioxide (CO2) emissions, which have an impact on the environment and sustainability. This study aims to investigate the effect of using metakaolin as a partial replacement for cement at percentages of 10%, 20%, 30%, 40%, and 50%. This study employs an experimental method, with previous literature serving as a reference. The mortar specimens were cast in 50 mm cubic molds and tested for compressive strength at curing ages of 7, 14, 21, and 28 days.. A total of 96 specimens were used, with each variable comprising 4 specimens. The compressive strength of metakaolin-substituted mortar is compared with normal mortar. Partial cement replacement(10% & 20%) shows higher strength in comparison with normal mortal. 10% metakaolin replacement increase the mortar strength by 42,37%. However the replacement of metakaolin at 30%, 40%, 50% decrease the strength of the mortar , the lowest strength is at 50% replacement (61.86%.). Keywords: Mortar, Metakaolin, Cement Replacement, Compressive Strength]]>
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