Impact Performance of Thin Prefabricated Ultra-High- Performance Concrete Façade

Ultra-high-performance concrete (UHPC) has gained popularity for use as facades due to its high strength, durability, ductility, thermal mass, formability, and various resistances (water, heat, light, and so on). Newly developed color variants provide a variety of color choices that conceal the steel fiber on its surface and corrosion thereof, which can have a negative effect. This study aims to evaluate impact resistance of thin UHPC panels having steel fibers with color variants. Impact performance of white colored UHPC was compared with that of non-colored panels and granites in terms of specimen thickness. Depending on material used, peak compressive strain was differentiated. Strain history was recorded for each test and compared with scabbing theory. Spalling shape was determined using the impact resistance of the target. Shear plug occurred when the specimen had clear insufficient impact resistance. Both white colored and non-colored UHPC panels exhibited excellent impact performance. Unlike granites, brittle failure did not occur. Keywords: color concrete; impact performance; scabbing theory; ultra-high-performance concrete.