Nevy Sandra, Keiyu Kawaai, Andril Arafat, Muhammad Akbar Caronge, M.W. Tjaronge, Yaumal Arbi, Nidal Zuwida
This study examines the effects of using micro-silica as a partial cement replacement in mortar with normal and seawater, focusing on improving mechanical properties like compressive strength and ultrasonic pulse velocity (UPV), along with durability indicators such as electrical resistivity and corrosion potential. Mortar specimens were prepared with varying concentrations of micro-silica (5%, 7%, and 10%), and their performance was assessed after curing periods of 7, 28, and 90 days. Micro-silica increases compressive strength and lowers porosity owing to the pozzolanic reaction, which forms calcium silicate hydrate (C-S-H) and strengthens the concrete matrix. The optimum performance was at sea water-5% microsilica (SW-5MS), whereas larger quantities required more water and had worse hydration efficiency. For durability, micro-silica increased chloride-induced corrosion resistance, with SW-5MS outperforming accelerated corrosion and half-cell potential tests. However, prolonged exposure highlighted the need for further durability methods. If its proportions and curing conditions are tuned, micro-silica can produce high-performance, durable concrete for severe situations. © Springer Nature Switzerland AG 2025.
Department of Civil Engineering, Universitas Negeri Padang, Sumatra Barat, Indonesia; Civil and Environmental Engineering, Ehime University, Ehime, Japan; Department of Civil Engineering, Universitas Hasanuddin, Sulawesi Selatan, Indonesia
