Performance of lap splices in large-scale column specimens affected by ASR and/or DEF-extension phase.

Details

• Creators:
  Bracci, Joseph M.
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridges
  • Columns
  • Alkali silica reactions
  • Ettringite
  • Reinforced concrete
  • Deterioration
  • Recommendations
• Publication/ Report Number:
  FHWA/TX-15/0-5722-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas A&M Transportation Institute
• Abstract:
  A large experimental program, consisting of the design, construction, curing, exposure, and structural load ; testing of 16 large-scale column specimens with a critical lap splice region that were influenced by varying ; stages of alkali-silica reaction (ASR) and at least early-stage delayed ettringite formation (DEF), was ; conducted. This report details the developing expansion from late-stage ASR and at least early-stage DEF in ; the remaining eight specimens since September 2011 and the structural testing of two of these specimens ; during the three-year project extension phase. In comparison with the response of the control specimens, ; specimens exhibiting primarily ASR (and at least early-stage DEF) had similar initial stiffness and behavior ; up to first cracking, had about a 25 to 35 percent increase in post-cracking stiffness up to yielding, had about ; a 5 to 15 percent increase in yield strength, and showed no overall detrimental effects on the structural ; response. The increase in stiffness and strength can be explained by the resulting volumetric expansion of the ; concrete due to the ASR that engaged the transverse reinforcement for better confinement of the core ; concrete, and engaged the supplemental post-tensioning reinforcement and the column longitudinal ; reinforcement to generate additional axial compression load. Although the structural performance of column ; splice regions with varying levels of ASR and up to some DEF showed no detrimental effects, the ; vulnerability of the column splices with increased levels of DEF and other developing deterioration ; mechanisms, such as corrosion, could not be evaluated to date.
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• Format:
  PDF
• Funding:
  Project 0-5722
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28763/dot_28763_DS1.pdf
• File Type:
  [PDF - 16.55 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b9cee6c2550a1a515119915e7abc1af0c64324de78550c56e433626f34faf907