부산대학교 도서관

Reactive powder concrete (RPC) structures may be subjected to impact or blasting loading over their service life. However, eco-friendly fibers such as basalt fibers can enhance the damage resistance of concrete. This paper presents impact loading experiments on basalt fiber reinforced reactive powder concrete (BFRRPC) within a strain rate range of 100.5–322 s−1, examining the mechanical properties, energy evolution, and failure characteristics of BFRRPC. The results indicate that adding 1.0% basalt fiber significantly improves the dynamic compressive strength of RPC. At strain rate range of 100.5–118.5 s−1, the transmission energy and dissipated energy of RPC with 1.0% basalt fiber content increase by 59.2% and 26.8%, respectively, compared to RPC without fiber content. Shear cracks and tensile cracks coexist in the failure process of BFRRPC. The addition of basalt fibers promotes the formation of shear cracks, with the degree of tensile and shear cracking positively correlated with the loading level. Basalt fibers enhance impact resistance and reduce fractal dimension of RPC. The fractal dimension of BFRRPC is positively correlated with specific dissipated energy. However, under the same loading level, BFRRPC with 1.0% basalt fiber dissipates more energy by breaking or pulling out fibers between matrix cracks, rather than generating a large number of fragments. This leads to a lower fractal dimension and higher specific dissipated energy. On this basis, the study explores the effect of basalt fiber on the dynamic increase factor (DIF) of RPC, discusses the applicability of the Comite Euro-International du Beton (CEB) model in BFRRPC, and conducts a modified analysis of this model.