Understanding the effect of nano/micro-structures on anti-impact of nano-boron nitride filled cementitious composites


Wang J., Dong S., Li Z., ŞAHMARAN M. , Ding S., Han B.

CONSTRUCTION AND BUILDING MATERIALS, vol.298, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 298
  • Publication Date: 2021
  • Doi Number: 10.1016/j.conbuildmat.2021.123885
  • Title of Journal : CONSTRUCTION AND BUILDING MATERIALS
  • Keywords: Cementitious composites, Nano-boron nitride, Nano, microstructures, Anti-impact, Dynamic damage model, REACTIVE POWDER CONCRETE, SI-29 MAS-NMR, C-S-H, COMPRESSIVE BEHAVIOR, CARBON NANOTUBE, STEEL FIBER, PERFORMANCE, MORTAR, TEMPERATURE, MODEL

Abstract

This paper aims to investigate the effect of nano/micro-structures on anti-impact property of nano-boron nitride (nano-BN) filled cementitious composites, and to predict the dynamic mechanical behavior of the composites by introducing a damage constitutive model. It is found that nano-BN can fundamentally modify the micro-and even nano-structures of cementitious composites, and therefore greatly improve the anti-impact property of the composites at the macro level. Specifically, nano-BN refines the pore structure (especially at nano-scale) of composite matrix and increases its compactness. Furthermore, by enhancing polymerization state of silicate tetrahedron in C-S-H gel, nano-BN improves the micromechanical properties of hydration products at different micro-zones. Consequently, dynamic mechanical property of cementitious composites at macro-level is enhanced, and the energy absorption capacity is improved. In addition, dynamic damage model indicates that nano-BN inhibits the damage of cementitious composites, but its inhibition form changes with the strain rate. (c) 2021 Elsevier Ltd. All rights reserved.