Effect on permeability of concrete made with successive recycled aggregate and silica fume

Abstract

The explosion in population has led to urbanization and industrialization, necessitating the need for massive and typical structures. Hence the construction technologists are continuously striving to make use of alternative materials in manufacturing of concrete. This study presents the use of successive recycled concrete aggregate (SRCA) which was obtained from the old concrete made with recycled concrete aggregate (RCA). The mechanical and permeability properties were determined by replacement of natural coarse aggregates (NCA) with SRCA at 0%, 25%, 50%, 75%, and 100% with and without use of 10% silica fume (SF). Tests such as compressive strength, water penetration, and capillary suction were conducted. Improved results were obtained up to 25% replacement of NCA with SRCA in the presence of 10% SF. The loss in permeability can be compensated up to some extent with the addition of 10% SF clubbed with replacement of NCA with SRCA.