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High Performance Concrete in Texas Bridges
Author(s) and Affiliation(s):
Ned H. Burns, Shawn P. Gross and Michael O. Braun Department of Civil Engineering University of Texas at Austin, Austin, TX
Principal Investigator:
Ned H. Burns
Texas Department of Transportation and the Federal Highway Administration
Research Start Date:
July 1993
Expected Completion Date:
September 1999
Research Objectives:
The two bridges in this research have quite different cross sections (U-shape and I-shape) and are in two different parts of Texas (370 miles apart). Both research projects have the overall objective of monitoring actual performance using high performance concrete (HPC) with maximum concrete strength in the 13-15 ksi (41 to 103 MPa) range. Development of the mix designs for the actual concrete mixes used in the construction of both the prestressed concrete girders and the decks for these bridges was an important objective. Documentation of the actual strength achieved in the construction of the bridges, as well as the shrinkage and creep characteristics of HPC, is being obtained. Instrumentation installed in the bridges will monitor performance of HPC over the period of the project. Both projects use 0.6-in diameter strands on a 2 x 2-in (50 mm) grid layout. Data on the transfer length of these strands in pretensioned prestressed concrete members is an important objective. Tests also being conducted on development length, for 0.6-in strand.
Expected Products or Deliverables:
Two HPC bridges in Texas are being built in this project - one in Houston and the other in San Angelo. The actual performance of these bridges is being carefully monitored, and the actual long-term observed behavior of HPC will support improved design practice with this material.

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