Simulation of prepackaged grout bleed under field conditions : [summary].

Details

• Creators:
  Hamilton, H.R.
• Corporate Creators:
  University of Florida
• Subject/TRT Terms:
  Admixtures Bleeding (Pavements) Calcium Carbonate Field Tests Fillers (Materials) Grout Portland Cement Posttensioning Simulation Tubing
• Publication/ Report Number:
  BDK75-977-59
• Resource Type:
  Brief
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  Post-tensioning (PT) is a method of compensating
  
  for concrete’s weakness under tension by adding
  
  steel. Tubes (ducts) are cast into concrete
  
  components; after the concrete sets, high-strength steel cables (tendons or strand) are run
  
  through the ducts, secured at both ends, and
  
  tensioned by powerful jacks. The ducts are then
  
  filled with PT grout, which hardens, preventing
  
  corrosion and bonding the cables to the concrete.
  
  PT is a very successful and widely used method.
  
  However, its durability depends on the quality of
  
  the grout and its installation. Since grouting is a
  
  blind operation, some problems with grout only
  
  become apparent years later — as soon as two
  
  years in some cases. Voids or other irregularities in
  
  grout distribution or setting can lead to corrosion,
  
  which can lead to failure of the concrete
  
  component. In this report, University of Florida
  
  researchers focused on a problem which has been
  
  found in several bridges in Florida, soft grout —
  
  grout which has not hardened after many years
  
  and is often associated with corrosion.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:820eaa7f0ceccec672507eaa2d72a82d25d59bb3f695f42ed879587054476717
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27336/dot_27336_DS1.pdf
• File Type:
  [PDF - 835.52 KB ]