<![CDATA[Lakapera is one of the villages in Gu District, Central Buton Regency, Southeast Sulawesi. The people of Lakapera Village, Southeast Sulawesi Province, often use aggregates from the sea and mountains found in the village. This is due to the absence of a river in Lakapera Village which results in the use of sea sand aggregate and crafted stone of mountain stones as building materials. The purpose of this research is to provide information about the condition of aggregate characteristics from Lakapera Village that can be used as a mixture material in making concrete and to obtain how strong it is produced. The test piece process was made by replacing part of the local aggregate using sea sand and crushed stone from Mount Lakapera Village with a mixture percentage of 5%, 15%, and 30% on the 7, 14, 21, and 28 days of concrete age. Based on the result, the material characteristics of all aggregates are safe to use as concrete materials. The results showed that the compressive strength obtained decreased by a percentage of 2,20% of the test specimen (70:30%), from the initial compressive strength of 18,7MPa, in the 28 day concrete age test. The compressive strength of concrete using mixed materials 0%, 5%, 15%, and 30% at the 28-day age concrete was 19,50MPa with a percentage of 104,28% (Test specimen 100:0%), 18,75MPa or 100,29% (Test specimen 95:5%), 18,47MPa or 98,79% (Test specimen 85:15%), and compressive strength of 18,28MPa or 97,80% (Test specimen 70:30%) of the planned compressive strength.]]>
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