Rheology limits for grout materials used for precast bent cap pile pockets in hot weather.

Details

• Creators:
  Kampmann, Raphael ; Roddenberry, Michelle D. ; Oertker, Stefan ; Ebbing, Christoph
• Corporate Creators:
  FAMU-FSU College of Engineering (Tallahassee, Fla.). Department of Civil Engineering ; Florida State University. Department of Civil and Environmental Engineering
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  ABC Connection Accelerated Bridge Bents Construction Grout, Pile Head-to-bent Cap Grouting Hot Weather Construction Hot Weather Grouting Pile-pocket Pile Caps Prefabricated Bridges Rheology Rheology Limits

  More +
• Publication/ Report Number:
  BDV30 TWO 977-16
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida Department of Transportation
• Abstract:
  While prefabricated bridge elements and systems (PBES) have been used for many years in Florida, The Florida Department
  
  of Transportation (FDOT) is currently developing local specifications for PBES to ad- dress the Federal Highway
  
  Administration (FHWA) Every Day Count (EDC) initiative. The construction on the first designated PBES project in Florida
  
  started in 2013 on the US90 between Tallahassee and Quincy. Individual pre-fabricated elements were pieced together and –
  
  if needed – grouted to complete the connection details. During the pilot project, grout material was wasted due to the
  
  restrictive temperature range and flow rate limitations, specified by the grout manufacturer, or due to inadequate sealing of
  
  the connection point. This research aimed to evaluate grouted pile pocket connections to assist the standardization pro- cess.
  
  Information was gathered through simulating different flow spaces (grout gaps) as well as varying grout consistencies and
  
  temperatures, while documenting the flow, final air voids, the temperature development during the hardening process, and
  
  final grout strength. For acceptance testing, contractors generally model the structural elements from plywood. Therefore,
  
  the pile head for the mockup specimens was made from plywood as well. However, to allow for grout flow observations, the
  
  pile pocket was constructed from acrylic glass. PVC pipes were installed on top of the pile-pocket model to aid the filling
  
  and ventilation process, simulating ducts used in field construction. Throughout the research, it was determined that the fresh
  
  grout temperature, the viscosity of the material and the thickness of the gap between the pile head and the bent cap does not
  
  significantly affect the quality of the grout flow and fillability. However, it was found that a tapered roof (7%) inside the pile
  
  pocket promotes proper ventilation for the displaced air and helps to avoid air entrapment above the pile head corners.
  
  Additionally, it was noted that the current construction tolerances may lead to critical hydration temperatures for massive
  
  (high volume-to-surface ratio) grout volumes under hot weather conditions. The research suggests more rigorous
  
  construction tolerances to achieve a desired maximum gap size opening of less than 4 in. (100 mm).
  
  
• Format:
  PDF
• Funding:
  037124
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:4e976234769c2790b7892ae633d7a934bedebadfab9d32a009c6a6001e89fe89
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31952/dot_31952_DS1.pdf
• File Type:
  [PDF - 3.55 MB ]