Karakteristik Beton Dengan Penambahan Silica Fume Pada Benda Uji Rigid Pavement

This research analyzes the effect of adding silica fume on the flexural strength, compressive strength, water absorption, and carbonation of concrete. Construction work in coastal areas must use waterproof concrete to prevent reinforcement corrosion caused by seawater seepage, which contains high salt levels and has the potential to decrease concrete's durability. Silica fume is a very fine pozzolanic material that fills small voids between cement particles, used to produce high-strength and high-durability concrete. In this study, silica fume was added at 15% of the cement's weight. The research method includes testing the physical properties of materials using aggregates from Tanjung Balai Karimun, as well as testing concrete samples at 7, 14, and 28 days in the laboratory. As a result, concrete with added silica fume soaked in seawater (BS-AL) showed the most optimal performance. BS-AL had consistent compressive strength and the highest flexural strength of 8.7 MPa at all testing ages. In addition, BS-AL also had the lowest absorption (0.116% - 0.166%), which indicates very good density and water resistance. The carbonation test showed no significant carbonation, as the inner part maintained a high alkalinity. This makes BS-AL concrete an ideal choice for maritime structures.