01340083

Component

https://doi.org/10.3141/2251-13

http://scholar.google.com...shee&publication_year=2011

A sufficient concrete cover is essential to ensure the durability of reinforced concrete structures. Nondestructive testing methods that can measure the concrete cover are therefore promising tools. As a part of a research project funded by the Florida Department of Transportation, the capabilities and limitations of cover meter measurements in relation to this testing problem were investigated. Researchers designed a reinforced concrete test block on which properties such as rebar depth, size, and spacing and number of reinforcement layers were varied; the effects these variations had on the measurements were studied. The use of an automated testing frame consisting of two scanners that examined the test block from both sides ensured high positioning accuracy and constant quality in data acquisition and made possible the collection of the data along an extremely dense grid. In addition to the cover meter measurements, which referred only to the cover of the layer closest to the surface, ultrasonic pulse echo measurements were conducted, and a synthetic aperture focusing technique was applied to the data to make the rebars become apparent in refined B-scan images.

01361668

11-4008

English

pp 123-131

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167710

Print

Figures; Photos; References (8)

Data collection; Durability; Nondestructive tests; Reinforced concrete bridges; Reinforcing bars; Ultrasonic tests

Automatic scanning devices; Cover depth (Rebars); Pulse echo method; Synthetic aperture focusing technique

Florida

Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB, ATRI

Feb 17 2011 6:43PM

• Challenges of Skew in Bridges with Steel Girders
• Characterization of Strength and Durability of Ultra-High-Performance Concrete Under Variable Curing Conditions
• Controlled Low-Strength Material Used Around Buried Pipelines
• Design and Construction of Two New Retrofit Combination Steel and Concrete Bridge Rail Designs
• Evaluation of Load Rating and System Reliability of Movable Bridge
• Experimental and Analytical Evaluations of Confinement Reinforcement in Pretensioned Concrete Beams
• Fatigue Response in Bridge Deck Connection Composed of Field-Cast Ultra-High-Performance Concrete
• Nondestructive Detection of Delamination in Concrete Slabs: Multiple-Method Investigation
• Nonlinear, Effective-Stress Ground Motion Response Analyses Following AASHTO Specifications for Load and Resistance Factor Design Seismic Bridge Design
• Reducing Fatigue in Wind-Excited Support Structures of Traffic Signals with Innovative Vibration Absorber
• Relationships of Barge Bow Force–Deformation for Bridge Design: Probabilistic Consideration of Oblique Impact Scenarios
• Seismic Retrofitting of Cruciform-Shaped Columns by Jacketing with Fiber-Reinforced Polymer
• Structural Behavior of Waffle Bridge Deck Panels and Connections of Precast Ultra-High-Performance Concrete: Experimental Evaluation
• Transfer and Development Lengths and Prestress Losses in Ultra-High-Performance Concrete Beams
• Vibration Versus Deflection Control for Bridges with High-Performance Steel Girders