Autogenous shrinkage, microstructure, and strength of ultra-high performance concrete incorporating carbon nanofibers

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Abstract

The mix design of ultra-high performance concrete (UHPC) is complicated by the presence of many "ingredients." The fundamental packing density allows a simpler mix design with fewer ingredients to achieve optimum packing density and dense microstructure. The optimum particle grading increases the flowability of UHPC and eliminates entrapped air. This study presents a simplified particle grading design approach that positively influences the strength, autogenous shrinkage, and microstructure characteristics of UHPC. Carbon nanofibers (CNFs) of superior mechanical properties were added to enhance the strength of UHPC and to reduce its autogenous shrinkage. In addition, ground granulated blast-furnace slag (GGBS) was used as a cement replacement material to reduce the amount of cement in UHPC mixes. Test results showed that the presence of homogeneously dispersed CNF increased the compressive strength and compensated the autogenous shrinkage of UHPC. The findings indicated that an ideal particle distribution, which is close to the modified Andreasen and Andersen grading model, contributed to achieving high compressive strength and CNFs were capable of providing nano-bridges to compensate the shrinkage caused by GGBS.

Original languageEnglish
Article number320
JournalMaterials
Volume12
Issue number2
DOIs
Publication statusPublished - 21 Jan 2019

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High performance concrete
Carbon nanofibers
Microstructure
Slags
Compressive strength
Cements
Concrete mixtures
Mechanical properties
Air

Keywords

  • Autogenous shrinkage
  • Carbon nanofibers (CNFs)
  • Compressive strength
  • Entrapped air
  • Flowability
  • Microstructure
  • Nanostructure
  • Particle grading
  • Ultra-high performance concrete (UHPC)

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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