Evaluation of concrete bridge mix designs for control of cracking, phase I.

Details

• Creators:
  Tremblay, Jason ; Wild, Jim
• Corporate Creators:
  Vermont. Agency of Transportation. Materials and Research Section
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Concrete bridges
  • Mix design
  • Cracking of concrete pavements
  • High strength concrete
  • Flexural strength
  • Compressive strength
  • Freeze thaw durability
  • Shrinkage
  • Bridge decks
• Publication/ Report Number:
  2014-09
• Resource Type:
  Tech Report
• Geographical Coverage:
  Vermont
• Corporate Publisher:
  Vermont. Agency of Transportation. Research and Development Section
• Abstract:
  Cracking of concrete is a common problem with concrete structures such as bridge decks, pavements and bridge ; rail. The Agency of Transportation (VTrans) has recently invested in higher performing concrete mixes that are ; more impervious and has higher early strength. VTrans has also begun to standardize on bare decks on bridge ; rehabilitation projects. Higher strength concrete is more susceptible to cracking. With more decks being ; constructed with exposed concrete, the risks of chlorides and other corrosives penetrating to the reinforcing may ; lead to early deterioration. Additional moisture within the concrete may compound the deterioration during freeze-thaw periods. These stressors lead to decreased strength, which results in increased maintenance to ensure ; safety and durability, a reduction in the overall aesthetics of the structures and a decrease in public confidence and ; support. With closer attention made to the concrete mix by the addition of key admixtures, concrete may be able ; to perform as desired with fewer resulting problems. ; With 22 different concrete mix designs produced and tested for various concrete properties, flexural and ; compressive strength, rapid chloride permeability and shrinkage, it is clear that there are seven candidate designs, ; given the measured data, which could outperform current VTrans standards. To ensure successful performance of ; new mix designs, further testing on each, with additional refining, a second phase of this project has been ; approved, with the same testing parameters, to refine the chosen mix designs further. The refining of designs will ; entail further optimization of aggregate gradations, as the industry has trended towards reporting benefits of this, ; lowering only cement content to achieve design strength within 10% at 28 days while other components remain ; unchanged in a mix, and include shrinkage control measures in most if not all mixes.
  More +
• Format:
  PDF
• Funding:
  RSCH016-710
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28277/dot_28277_DS1.pdf
• File Type:
  [PDF - 2.70 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2d84daf3e6cab70cb7319674bd707e52c559d81404660c010e58f20975a0b433