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

Jialiang Wang, Sufen Dong, Zhenming Li, Mustafa Şahmaran, Siqi Ding, Baoguo Han

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
Article number123885
Pages (from-to)1-13
Number of pages13
JournalConstruction and Building Materials
Volume298
DOIs
Publication statusPublished - 2021

Keywords

  • Anti-impact
  • Cementitious composites
  • Dynamic damage model
  • Nano-boron nitride
  • Nano/microstructures

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