Modelling early age drying in fibre-reinforced concretes

Tara Rahmani, Mehdi Bakhshi, Barzin Mobasher, Mohammad Shekarchi

Research output: Contribution to journalConference article

Abstract

Plastic shrinkage cracking due to a high rate of evaporation detrimentally affects durability and serviceability of concrete structures. The effect of different types of fibres to control these cracks, including steel, glass, polypropylene, and polyolefin fibres on the moisture loss and evaporation rates is investigated by performing ASTM CI579 tests. Using a dual stage methodology of constant drying rate period (stage I) and falling drying rate period (stage II), results are analysed. Moisture diffusivities are computed which in turn can be used for modelling the drying shrinkage and cracking under different environmental conditions. The formation of microcracks is documented using digital photography and processed by image analysis. The results show that moisture diffusivities at stage I drying are similar to each other between FRC and control samples. These magnitudes are approximately 50 times higher than diffusivities at stage II drying. The main difference is observed in stage II drying where the diffusivities in FRC are lower compared to plain concrete. Image analysis results indicate significant effects of fibres on controlling plastic shrinkage cracks.

Original languageEnglish (US)
Pages (from-to)141-150
Number of pages10
JournalAmerican Concrete Institute, ACI Special Publication
Volume2014-July
Issue numberSP 310
StatePublished - Jan 1 2014
EventJoint ACI-fib International Workshop on Fibre-Reinforced Concrete: From Design to Structural Applications, FRC 2014 - Montreal, Canada
Duration: Jul 24 2017Jul 25 2017

Fingerprint

Reinforced concrete
Drying
Fibers
Moisture
Image analysis
Evaporation
Plastics
Cracks
Polypropylenes
Steel
Polyolefins
Photography
Microcracks
Concrete construction
Durability
Concretes
Glass

Keywords

  • Cracking
  • Diffusivity
  • Drying
  • Fibre-reinforced concrete
  • Plastic shrinkage

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

Rahmani, T., Bakhshi, M., Mobasher, B., & Shekarchi, M. (2014). Modelling early age drying in fibre-reinforced concretes. American Concrete Institute, ACI Special Publication, 2014-July(SP 310), 141-150.

Modelling early age drying in fibre-reinforced concretes. / Rahmani, Tara; Bakhshi, Mehdi; Mobasher, Barzin; Shekarchi, Mohammad.

In: American Concrete Institute, ACI Special Publication, Vol. 2014-July, No. SP 310, 01.01.2014, p. 141-150.

Research output: Contribution to journalConference article

Rahmani, T, Bakhshi, M, Mobasher, B & Shekarchi, M 2014, 'Modelling early age drying in fibre-reinforced concretes', American Concrete Institute, ACI Special Publication, vol. 2014-July, no. SP 310, pp. 141-150.
Rahmani, Tara ; Bakhshi, Mehdi ; Mobasher, Barzin ; Shekarchi, Mohammad. / Modelling early age drying in fibre-reinforced concretes. In: American Concrete Institute, ACI Special Publication. 2014 ; Vol. 2014-July, No. SP 310. pp. 141-150.
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