Strength and durability performance of ultra-high-performance cementitious composite enhanced with carbon nanofibres

J. L.G. Lim, S. N. Raman, M. F.M. Zain, R. Hamid, F. C. Lai

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

Ultra-high-performance concrete (UHPC) is known for exhibiting excellent strength and a more durable matrix compared to conventional concrete. Typically UHPC consists of carefully selected constituent materials of: Ultrafine graded sand, silica fume (or other alternative binders), steel micro-fibres, and ordinary (or special blends) Portland cement. This study was initiated to synthesize a new blend of Ultra-high-performance cementitious composite (UHPCC) with compressive strength higher than 150 MPa under normal curing conditions, and to investigate the influence of two different sources of carbon nanofibres (CNF) on its strength, durability and microstructure properties. Several mix designs with different CNF percentages were designed, optimised and analysed to obtain the optimal proportion for the UHPCC, and their strength development were monitored up to 28 days. Subsequently, the durability performance of the selected UHPCC mixes were characterised though the rapid chloride permeability, Mercury Intrusion Porosimetry and water penetration tests. It was found that a stable dispersion with low CNF percentage (0.06%wt) was able to improve the water penetration, lower the rapid chloride permeability and reduced the pore sizes of the UHPCC matrix. The overall findings of the research assert that a stable dispersion of CNF contributes in positive effect on the strength and durability characteristics of UHPCC, and is feasible to enhance overall microstructure and contribute to a denser matrix. This study is part of the larger research programme to synthesize an innovative UHPCC mix for specialised applications for structures under impulsive loadings.

Original languageEnglish
Title of host publication6th International Conference on Durability of Concrete Structures, ICDCS 2018
EditorsP. A. Muhammed Basheer
PublisherWhittles Publishing
Pages227-232
Number of pages6
ISBN (Electronic)1849953945, 9781849953948
Publication statusPublished - 2018
Externally publishedYes
EventInternational Conference on Durability of Concrete Structures 2018 - Leeds, United Kingdom
Duration: 18 Jul 201820 Jul 2018
Conference number: 6th
https://www.rilem.net/agenda/sixth-international-conference-on-durability-of-concrete-structures-icdcs-2018-leeds-uk-1205

Conference

ConferenceInternational Conference on Durability of Concrete Structures 2018
Abbreviated titleICDCS 2018
Country/TerritoryUnited Kingdom
CityLeeds
Period18/07/1820/07/18
Internet address

Keywords

  • Carbon nanofibres (CNF)
  • Compressive strength
  • Durability
  • Nano-engineered
  • Porosity
  • Ultra-high-performance cementitious composites (uhpcc)

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