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:
  Bridge Decks Compressive Strength Concrete Bridges Cracking Of Concrete Pavements Flexural Strength Freeze Thaw Durability High Strength Concrete Mix Design Shrinkage
• 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.
  
  
• Format:
  PDF
• Funding:
  RSCH016-710
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2d84daf3e6cab70cb7319674bd707e52c559d81404660c010e58f20975a0b433
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28277/dot_28277_DS1.pdf
• File Type:
  [PDF - 2.70 MB ]