In order to improve the failure state of over-reinforced beams and enhance their ductility, an innovative reinforcement method was proposed by adding ultrahigh performance concrete (UHPC) layer on top surface beam take advantage high compressive strength UHPC. The numerical simulation used carry out research. validity finite element model verified comparing it with experimental results, effecti...

The scope of this paper is to investigate the performance ultra-high fiber reinforced concrete (UHPFRC) slabs, under projectile impact. Mixture impact loading was examined using bullets with 7.62 mm diameter and initial velocity 800 m/s. UHPFRC, used in study, consists a combination steel fibers two lengths: 6 13 same 0.16 mm. Six composition mixtures were tested, four one (UHPC), without fiber...

We present the first systematic algorithm to estimate the maximum packing density of spheres when the grain sizes are drawn from an arbitrary size distribution. With an Apollonian filling rule, we implement our technique for disks in 2d and spheres in 3d. As expected, the densest packing is achieved with power-law size distributions. We also test the method on homogeneous and on empirical real ...

To better understand the failure behavior of cementitious materials during dynamic loading, microstructural damage initiation and development in an ultra-high-performance concrete (UHPC) a special type conventional (CC) with average aggregate size only 2–3 mm are comparatively studied using X-ray computed micro-tomography (micro-CT) technique. Quantitative measurements reconstructed 3D crack mo...

Abstract The application of Ultra High‐Performance Fiber Reinforced Concrete (UHPFRC) is increasing worldwide to repair and strengthen existing structures. One the main applications in bridge components, e.g., decks piers, but also floors residential or industrial buildings realize construction joints prefabricated members. To properly design a strengthening intervention with UHPFRC, bond betwe...

In the present study, performance of Reinforced Concrete (RC) beams which were strengthened with Ultra High Performance Fiber (UHPFRC) and dowels at interface was investigated. RC a length 2.2 m UHPFRC layers tensile side. Before application layers, between roughened. During testing, slips recorded using Linear Variable Differential Transformers (LVDTs). The tested under four-point flexural tes...