<![CDATA[This study examined the compressive strength and porosity of PCC concrete and POFA concrete with the addition of silica fume soaked in peat water. POFA is used as a cement substitute with variations of 0% and 20% and the addition of silica fume is 10%. The design compressive strength is 20 MPa. Treatment of the specimens was carried out in normal water for 28 days and then immersed in peat water for 0, 7 and 28 days. The results of testing the compressive strength of concrete at 28 days of immersion in peat have increased 16.73% with 29.24 MPa in PCC concrete, 29.49% with 32.69 MPa in POFA 0% concrete and 17.58% with 25.77 MPa in POFA 20% concrete. The porosity value of PCC concrete at 28 days of peat decreased by 6.55%. A decrease in porosity values also occurred in POFA 0% concrete and POFA 20% concrete by 20% and 26.78% at 28 days of peat. Based on the test results, it can be concluded that replacing cement with POFA and adding silica fume to concrete has a positive impact on the compressive strength and porosity of concrete in peat water. Key words: Compressive strength, porosity, POFA, silica fume, peat water]]>
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