Abstract

Early-age cracks on concrete surfaces are one of the main routes through which aggressive agents penetrate into the concrete and threaten the long-term durability of structures. A test method capable of simulating early-age shrinkage cracks in 2-D cement paste samples under low-pressure condition is presented. The method is capable of characterizing evaporation parameters in two distinct stages of drying while monitoring sequential formation of shrinkage cracks. Using a gravimetric approach, the mass loss of the specimen is monitored continuously throughout the test as the sample is subjected to low pressure environment. Formation of microcracks are documented simultaneously using digital time lapse photography. The mass loss data is used in conjunction with specimen, size, and thickness to compute the evaporation rate from the surface. These results are used in turn using a diffusion based model to compute the effective moisture diffusivity as a function of fiber dosages. Effects of AR-glass fibers on evaporation parameters and shrinkage cracks are studied. Image analysis results indicate significant effects of fiber on controlling early-age shrinkage cracks.

Original languageEnglish (US)
Title of host publicationAmerican Concrete Institute, ACI Special Publication
Pages36-48
Number of pages13
Edition280 SP
StatePublished - 2011
EventAdvances in Fiber Reinforced Concrete Durability and Field Applications at the Spring 2011 ACI Convention - Tampa, FL, United States
Duration: Apr 3 2011Apr 7 2011

Other

OtherAdvances in Fiber Reinforced Concrete Durability and Field Applications at the Spring 2011 ACI Convention
CountryUnited States
CityTampa, FL
Period4/3/114/7/11

Fingerprint

Alkalies
Glass fibers
Cracks
Evaporation
Concretes
Special effects
Fibers
Microcracks
Ointments
Image analysis
Drying
Cements
Durability
Moisture
fiberglass
Monitoring

Keywords

  • AR-glass
  • Cement paste
  • Cracking
  • Evaporation
  • Fiber
  • Glass fibers
  • Moisture diffusivity
  • Plastic shrinkage

ASJC Scopus subject areas

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

Cite this

Bakhshi, M., & Mobasher, B. (2011). Simulated shrinkage cracking in the presence of alkali resistant glass fibers. In American Concrete Institute, ACI Special Publication (280 SP ed., pp. 36-48)

Simulated shrinkage cracking in the presence of alkali resistant glass fibers. / Bakhshi, M.; Mobasher, Barzin.

American Concrete Institute, ACI Special Publication. 280 SP. ed. 2011. p. 36-48.

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

Bakhshi, M & Mobasher, B 2011, Simulated shrinkage cracking in the presence of alkali resistant glass fibers. in American Concrete Institute, ACI Special Publication. 280 SP edn, pp. 36-48, Advances in Fiber Reinforced Concrete Durability and Field Applications at the Spring 2011 ACI Convention, Tampa, FL, United States, 4/3/11.
Bakhshi M, Mobasher B. Simulated shrinkage cracking in the presence of alkali resistant glass fibers. In American Concrete Institute, ACI Special Publication. 280 SP ed. 2011. p. 36-48
Bakhshi, M. ; Mobasher, Barzin. / Simulated shrinkage cracking in the presence of alkali resistant glass fibers. American Concrete Institute, ACI Special Publication. 280 SP. ed. 2011. pp. 36-48
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AB - Early-age cracks on concrete surfaces are one of the main routes through which aggressive agents penetrate into the concrete and threaten the long-term durability of structures. A test method capable of simulating early-age shrinkage cracks in 2-D cement paste samples under low-pressure condition is presented. The method is capable of characterizing evaporation parameters in two distinct stages of drying while monitoring sequential formation of shrinkage cracks. Using a gravimetric approach, the mass loss of the specimen is monitored continuously throughout the test as the sample is subjected to low pressure environment. Formation of microcracks are documented simultaneously using digital time lapse photography. The mass loss data is used in conjunction with specimen, size, and thickness to compute the evaporation rate from the surface. These results are used in turn using a diffusion based model to compute the effective moisture diffusivity as a function of fiber dosages. Effects of AR-glass fibers on evaporation parameters and shrinkage cracks are studied. Image analysis results indicate significant effects of fiber on controlling early-age shrinkage cracks.

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