@article{01J00QR60FCEBQJ10230FSNE97,
  abstract     = {{Ultra High-Performance Concrete (UHPC) is widely acknowledged for its remarkable mechanical properties, owing to its compact microstructure. The response of UHPC to impact forces plays a vital role in ensuring the safety and longevity of structures, specifically in protective buildings, high-performance pavements and offshore concrete structures. In this context, this paper reports on an experimental investigation aimed at assessing the effects of stimulated autogenous self-healing of UHPC on the recovery of its performance under impact loadings. Drop weight tests were performed on UHPC slabs, with a 10 kg heavy impactor dropped from the height of 1 m on the centre of the specimens. Specimens were pre-cracked by repeated impacts up to 40% of their predetermined capacity. Pre-cracked specimens were exposed to different healing conditions, water submersion, 95% +/- 5% RH, and wet/dry cycling (12/12 h) either in water or in a NaCl solution. Self-healing was evaluated through rebound height, elastic stiffness recovery, natural frequency, and laser displacement measurements. High-speed cameras and Digital Image Correlation were used to capture rebound height and crack formation. Performance was assessed at time 0, pre-damaging, 1, 2, and 4 months. After the healing period, all specimens were tested to failure. Specimens exhibited an increasing healing efficiency when moving from 95% +/- 5% RH, over wet/dry cycling, to submerged conditions. Specimens healed continuously under submerged conditions exhibited a complete closure of surface cracks (50-150 mu m) and an 80% recovery in natural frequency. Furthermore, they showed a more than 10% increase in stiffness and energy dissipation capacity after four months of healing.}},
  articleno    = {{105239}},
  author       = {{Kannikachalam, Niranjan Prabhu and  Peralta, Paula Sofia Marin and Snoeck, Didier and De Belie, Nele and  Ferrara, Liberato}},
  issn         = {{0958-9465}},
  journal      = {{CEMENT & CONCRETE COMPOSITES}},
  keywords     = {{Self-healing,Impact test,Ultra high-performance concrete,Crystalline admixture,Autogenous self-healing,REINFORCED CEMENTITIOUS COMPOSITES,FIBER DISPERSION,MAGNETIC METHOD,PART 1,MICROFIBERS,ORIENTATION,POLYMER}},
  language     = {{eng}},
  pages        = {{19}},
  title        = {{Assessment of impact resistance recovery in Ultra High-Performance Concrete through stimulated autogenous self-healing in various healing environments}},
  url          = {{http://doi.org/10.1016/j.cemconcomp.2023.105239}},
  volume       = {{143}},
  year         = {{2023}},
}

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