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Arabian Journal for Science and Engineering

, Volume 44, Issue 2, pp 1403–1413 | Cite as

Effect of Multiwalled Carbon Nanotubes on Sensing Crack Initiation and Ultimate Strength of Cement Nanocomposites

  • Fahad Al-MufadiEmail author
  • Hany A. Sherif
Research Article - Mechanical Engineering
  • 18 Downloads

Abstract

Sensing crack in multiwalled carbon nanotube (MWCNT)-reinforced cement under compression stress was investigated to aid in the temporal detection of crack initiation. Cement-based nanocomposite specimens were prepared with fixed proportions (e.g., water/cement ratio and sand/cement ratio) and varying concentrations of MWCNTs (0.01%, 0.02%, 0.1% and 0.2% by weight of cement). Microstructure was analyzed by means of a scanning electron microscope to show crack bridging and EDX spectroscopy to confirm the existence of MWCNTs in cement paste. Crack monitoring was presented through the variation of the temporal slope of electrical resistance during compression stress of nanocomposite samples. It is shown that temporal slope variation can be used as an index for crack warning owing to its well-defined patterns with distinct peaks that correlate with crack initiations and propagation. A significant increase in ultimate compressive strength with MWCNT concentration more than 0.1 wt% with respect to cement was observed.

Keywords

MWCNT–cement composite Polarization Crack initiations Crack sensing 

Abbreviations

AC

Alternating current

CNTs

Carbon nanotubes

CNFs

Carbon nanofibers

DC

Direct current

FCR

Fractional change in resistance

MWCNT

Multiwalled carbon nanotube

s/c

Sand-to-cement ratio

w/c

Water-to-cement ratio

List of symbols

F

Compressive force (N)

\(\Delta F\)

Change of force (N)

\(R_{0}\)

Initial electrical resistance of the cement composite (\(\Omega )\)

R(t)

Absolute electrical resistance at time t (\(\Omega )\)

\(\Delta R\)

Change of electrical resistance (\(\Omega )\)

t

Time (s)

\(t_\mathrm{d}\)

Time delay between measured compressive stress and electrical resistance (s)

\(\Delta t\)

Sampling time interval (s)

\(\beta \)

Slope of normalized electrical resistance with the time (\(\hbox {s}^{-1})\)

\(\kappa \)

Normalized electrical resistance

\(\sigma \)

Compression stress (MPa)

\(\psi \)

Sensitivity of cement composite at fracture (defined as the electrical resistance change \(\Delta R\) due to force change \(\Delta F\)), (\(\Omega \)/N)

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Notes

Acknowledgements

The authors wish to express their gratitude and sincere appreciation to the authority of King Abdul Aziz City for Sciences and Technology (KACST) for financing this research work.

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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringQassim UniversityBuraidahSaudi Arabia

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