United States Department of Transportation
i
Determination of In-Situ Compressive Strength of Precast Concrete Girders
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2017-12-15
[PDF-3.15 MB]
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Edition:Final Report 03/01/16 - 12/15/17
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Abstract:Verification of field compressive strength of precast concrete girders from 52 bridges in seven counties in California are presented. Nondestructive Testing (NDT) methods used are Proceq’s Silver Schmidt Rebound Hammer and Ultrasonic Pulse Velocity (UPV) and James Instruments’ Windsor Pin and Windsor Probe Systems. NDT tests were performed on concrete walls, slabs, and cylinders constructed under ambient and laboratory curing conditions at San Jose State University. Data from the laboratory testing in combination with data supplied by the manufacturer of the NDT equipment were utilized to develop strength prediction charts for the different bridge girders. Concrete cores from five selected bridges were taken, and compressive strength and NDT tests were performed and analyzed. Results obtained from the cores with the bridge prediction data were compared to verify accuracy of the predictions. The America Concrete Institute (ACI) 209 equation was utilized, and modified equations are proposed for more accurate bridge strength predictions.
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