Laboratory and Field Evaluations of Corrosion Resistance Reinforcement Virginia Concrete Conference Bridge Breakout Session March 4, 2011 9:00—9:30 a.m. Presented By: Stephen R. Sharp, Ph.D., P.E. Overview. Information from several research projects
Laboratory and Field Evaluations of Corrosion Resistance ReinforcementVirginia Concrete ConferenceBridge Breakout SessionMarch 4, 20119:00—9:30 a.m.
Presented By: Stephen R. Sharp, Ph.D., P.E.
Cost of Bars Range from $0.33 up to $3.50 / lb.
The Same Type of Steel Can Look Very Different
†Response measured using
coating thickness gage
Performed following Manufacturers Guidelines
Turn on x-ray fluorescence analyzer
Allow to warm up for 5 minutes
If XRF checks, proceed with analysis
if not, calibrate instrument and recheck
Alloy Identification Within Seconds
longer analysis time for greater accuracy
Total test time (warm-up + calibration)
less than 10 minutes
Provides alloy type,% confidence of alloy ID, list % elements detected, and confidence limit per element detectedLessons Learned: X-Ray Fluorescence
Care must be taken when accepting bars at the jobsite based on visual assessment and markings.
Cord width measurement
Rib spacing measurement
Rib height measurement
Bar diameter measurement
Rr = 0.80,
(From VTRC 04-R5)
The chromium content range listed eliminates all
candidate materials with a content greater than 10.9%
Loss of ASTM A276 decreased the number of UNS
designated stainless steel products by nearly 93%
End protection evaluation?Future Evaluation: Route 460 Over Route 29 Bypass, Campbell County
(From VTRC 04-R5)
Acknowledgements: Federal Highway Administration, VDOT Materials Division, VDOT Structure and Bridge Division, University of Virginia, Virginia Center for Transportation Innovation and Research, and Virginia Polytechnic Institute and State University