Strengthening of Retrofitting Using Short Column

Abstract

This study incorporates an experimental investigation aimed at evaluating the effectiveness and suitability of high-performance ferrocement mortar mixes as a retrofitting material. The experimental program involves the development of a high-performance ferrocement mortar mix by incorporating 10% silica fumes, which is subsequently utilized in retrofitting short column specimens that were either intact or distressed to a certain level. The experimental setup encompasses the testing of six controlled specimens and six retrofitted specimens. The controlled specimens, measuring 100mm x 100mm in cross-section and 500mm in height, are cast using M25 conventionally vibrated concrete. These specimens are reinforced longitudinally with four bars of 6mm diameter and six lateral ties of 6mm diameter serving as transverse reinforcement. The jacket of the specimens is reinforced with mild steel welded wire mesh, sized at 50mm x 50mm and made of 1.16mm diameter wire. The retrofitted specimens undergo testing after 28 days of curing. The addition of silica fume is integral to the experiment, enhancing the dispersion of fibers and improving the strength properties of the mortar mix, particularly its impact resistance. Previous studies have demonstrated that the inclusion of silica fume increases compressive, split tensile, and flexural strength, thereby enhancing the overall performance of concrete under impact loading conditions. A detailed examination of curing conditions is conducted, with half of the specimens allowed to cure naturally while the remaining half are cured in a controlled environment within a curing tank. Nevertheless, the study underscores the necessity for further investigations to comprehensively understand the efficiency of cracking and its implications on the retrofitting process.