Field Evaluation of Elliptical Fiber Reinforced Polymer Dowel Performance (Proj. 5)

Project Details
STATUS

Completed

START DATE

07/22/02

END DATE

06/30/05

RESEARCH CENTERS InTrans, CP TECH, CTRE
SPONSORS

Federal Highway Administration
Hughes Brothers

Researchers
Principal Investigator
Max Porter

Faculty Affiliate

Co-Principal Investigator
James K. Cable

Faculty Affiliate

Student Researcher(s)
John Harrington
Anthony Post
Nathan Pierson

About the research

Fiber reinforced polymer (FRP) composite materials are making an entry into the construction market in both buildings and pavements. The application to pavements so far has come in the form of joint reinforcement (dowels and tie bars). FRP resistance to salt corrosion in dowels has made it an alternative to standard epoxy-coated steel dowels for pavements. Iowa State University has completed a large amount of laboratory research to determine the diameter, spacing, and durability of FRP dowels.

This report documents the performance of elliptical FRP dowels installed in a field situation. Ten joints were monitored in three consecutive test sections, for each of three dowel spacings (10, 12, and 15 inches) including one instrumented dowel in each test section. The modulus of dowel bar support was determined using falling weight deflectometer (FWD) testing and a loaded crawl truck. FWD testing was also used to determine load transfer efficiency across the joint. The long-term performance and durability of the concrete was also evaluated by monitoring faulting and joint opening measurements and performing visual distress surveys at each joint. This report also contains similar information for standard round, medium elliptical, and heavy elliptical steel dowels in a portion of the same highway. In addition, this report provides a summary of theoretical analysis used to evaluate joint differential deflection for the dowels.

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