Dynamic increased reinforcing effect of graphene oxide on cementitious nanocomposite

Chen Yang Li, Shu Jian Chen, Wen Gui Li, Xiang Yu Li, Dong Ruan, Wen Hui Duan

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

The reinforcing effect of graphene oxide on cementitious materials under high strain rate remains largely unknown. Existing studies on microfiber reinforced cementitious composites showed that the dynamic increase factor (DIF) decreases due to these fibres. This study reports that the reinforcing effect of graphene oxide nanosheets can, in contrast, increase with strain rate. Tensile splitting and compression tests were conducted under both static and dynamic loadings. High strain rate, up to 1700 s−1 , is achieved using a split Hopkinson pressure bar apparatus. It is found that the DIF of graphene oxide nanocomposite only increase when the DIF is higher than a threshold which is about 780 and 30 s−1 for compression and tensile test respectively. The increased of DIF was correlated with the speed of crack development and pull-out of the graphene oxide nanosheets. Also, the pull-out or fracture of graphene oxide on fragmented sand was also found a possible contributing factor to the increased DIF. The findings of this study indicate the future potential of atomic-thin nanosheets for materials under extreme impact and blast loading.

Original languageEnglish
Pages (from-to)694-702
Number of pages9
JournalConstruction and Building Materials
Volume206
DOIs
Publication statusPublished - 10 May 2019

Keywords

  • Cementitious
  • Dispersion
  • Dynamic increase factor
  • Graphene Oxide
  • High strain rate

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