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This study aimed to determine the optimal composition of Rice Husk Ash (RHA) as a waste material replacing some of the cement and lime as a stabilizer for CSEB Bricks (Compressed Stabilized Earth Blocks) with maximum compressive strength for a curing time of 28 days. Conventional brick production carried out by the community is generally carried out by burning the bricks which produces atmospheric pollution and relatively large energy costs for making bricks. An alternative to unburned bricks to reduce energy use and carbon dioxide emissions is through CSEB production. However, the use of lime and cement as CSEB stabilizers makes the production cost of CSEB Bricks relatively more expensive. One solution is to replace some of the cement and lime materials with RHA as a stabilizer in producing CSEB Bricks. Testing includes the physical and mechanical properties of CSEB bricks mixed with cement + lime + RHA. From the results of the study, it was known that the effect of the stabilizers on the compressive strength of the prepared CSEBs were observed and determined after 28 days of 18 samples curing. The maximum compressive strength of CSEB was obtained as 3.98 N/mm² consisting of 5% cement, 2,5% lime, and 2,5% fly ash by weight and 20% of mixing water content by total weight of mixture.