4.7 Article

Behavior and design of nano/micro-scale carbon modified multifunctional cementitious composites

Journal

CONSTRUCTION AND BUILDING MATERIALS
Volume 314, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.125506

Keywords

Nano; micro-scale carbon modification; Nanofluid additive; Graphene; Carbon fiber; Multifunctional

Funding

  1. National Key Research and Development Program of China [2018YFE0124900]
  2. National Natural Science Foundation of China [51861165204/51778370]
  3. Shenzhen Science and Technology Project [GJHZ20180928155819738]
  4. Regional Joint Project for Foundation and Applied Basic Research of Guangdong Province [2019A1515110746]

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This work introduces a novel design concept for nano/micro-scale carbon modified multifunctional cementitious composites, leveraging the advantages of graphene/PVA nanofluid additive to enhance mechanical properties and electrical conductivity while maintaining or even improving mechanical strengths under low resistivity.
This work proposes a design concept of nano/micro-scale carbon modified multifunctional cementitious composites based on the original fabrication method of combined graphene/PVA nanofluid additive, in which nano carbon material graphene was produced from low-cost graphite raw material and surface functionalized by PVA in water in a one-step preparation process, which can directly substitute water in the cement casting. Incorporating the complementary advantages of the bridging three-dimensional micron-scale carbon fiber and the pore filling and lubricating two-dimensional nano-material graphene, the composite modification can not only improve the mechanical properties of cementitious composites but also gift them with high electrical conductivity, whose electrical resistivity dropped to 0.72 k omega.cm compared to 13.12 k omega.cm of the blank. In particular, under such low resistivity, the mechanical strengths were not reduced as with the addition of other single carbon materials but were improved compared with the blank. The results of this work provide a novel approach for designing and developing multifunctional cementitious composites, which would be a promising building material for structural health monitoring.

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