Effect of Silica Fume and GranulatedBlast Furnace Slag on the Durability of Partially-Damaged Concrete

Abstract

ABSTRACT. This study investigates the effect of silica fume (SF) and ground granulated blast furnace slag (GGBFS) on the durability properties of concrete subjected to compressive damage.Portland cement wasreplaced by 10% SF and 60% of GGBFS as a replacement of Portland cement.Thirty-six concrete cylinders (100 x 200 mm) were subjected to three compressive preloading levels (50%, 75%, and 90% of the ultimate strength capacity).After 28 days of curing, the concrete specimens were experimentally tested for electrical resistivity, rapid chloride penetration (RCPT) and the chloride migration.The experimental results showed that the SF increases the compressive strength of concrete by 50% of control concrete.Besides, the GGBFS improves the durability of concrete with the highest electrical resistivity about 4 and 1.85 times the OPC and SF concrete results, respectively. The chloride permeability in GGBFS was found to be about 78% and 65% less than OPC and SF concrete, respectively. The chloride migration coefficient increases in the control samples subjected to 90% compressive damage.However, the replacement of Portland cement with SF and GGBFS improved the concrete durability when subjected to compressive damage up to 90% of the compressive strength