EXPERIMENTAL STUDY OF NANO SILICA AND SILICA FUME CONCRETE COLUMN SUBJECTED TO CORROSION

The contemporary study scrutinizes the use of nano silica and silica fume in concrete. Nano silica and silica fume are highly pozzolanic nature. To improve the mechanical properties of concrete for M30 and M40 with the use of silica fume (5%, 7.5 %, 10 %, 12.5 %) and nano silica (1%, 2%, 3%, 4%) as the partial replacement of cement were studied. Corrosion of steel in ordinary concrete is continually growing and causes problem. This affects the performance and durability of concrete structural elements. Normally concrete act as a physical barrier to the aggressive environment for the reinforcing steel because of its high alkalinity. The corrosion of reinforcing steel in ordinary concrete occur due to lack of quality control in mixing, planning and consolidation an entrapping of air in the concrete, resulting in reliability permeable concrete. When the structures are exposed to corrosive environment, premature failure of R.C columns due to corrosion leads to ultimate structural failure. In order to overcome this situation to an exent possible, Corrosion resistance for conventional and nano silica and silica fume concrete column were studied by using accelerated corrosion technique.