Detection Of Voids In Prestressed Concrete Bridges Using

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Detection of Voids in Prestressed Concrete Bridges Using ...

Detection of Voids in Prestressed Concrete Bridges using Thermal Imaging and Ground-Penetrating Radar. Research Report . Project DTFH61-05-C-00008, Task No. 8 . DETECTION OF VOIDS IN PRESTRESSED CONCRETE BRIDGES USING THERMAL IMAGING AND GROUND-PENETRATING RADAR . by . David G. Pollock, Ph.D., P.E. Associate Professor . Kenneth J. Dupuis . Graduate

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Detection of Voids in Prestressed Concrete Bridges Using ...

19/12/2008  Ground-penetrating radar (GPR) inspection was conducted on fourteen concrete specimens between August and October 2007. Based on the GPR surveys conducted in this study, it is apparent that the detection of post-tensioning strands and simulated voids within grouted ducts embedded in concrete is possible with a 1.5 GHz GPR system.

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"Detection of Voids in Prestressed Concrete Bridges using ...

Ground-penetrating radar (GPR) inspection was conducted on fourteen concrete specimens between August and October 2007. Based on the GPR surveys conducted in this study, it is apparent that the detection of post-tensioning strands and simulated voids within grouted ducts embedded in concrete is possible with a 1.5 GHz GPR system.

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Detection of Voids in Prestressed Concrete Bridges Using ...

Detection of Voids in Prestressed Concrete Bridges Using Thermal Imaging and Ground-Penetrating Radar. Thermal imaging and ground-penetrating radar was conducted on concrete specimens with simulated air voids. For the thermal imaging inspections, six concrete specimens were constructed during the month of June 2007 to simulate the walls of post-tensioned box girder bridges. The

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Detection of Voids in Prestressed Concrete Bridges Using ...

Detection of Voids in Prestressed Concrete Bridges Using Thermal Imaging and Ground-Penetrating Radar

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"Detection of Voids in Prestressed Concrete Bridges using ...

Thermal imaging and ground-penetrating radar was conducted on concrete specimens with simulated air voids. For the thermal imaging inspections, six concrete specimens were constructed during the month of June 2007 to simulate the walls of post-tensioned box girder bridges. The objective was to detect simulated air voids within grouted post-tensioning ducts, thus locating areas where the post ...

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Detection of Voids in Prestressed Concrete Bridges using ...

Detection of Voids in Prestressed Concrete Bridges using ...

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Detection of Simulated Voids in Grouted Ducts using ...

The concrete slab specimens were constructed to simulate typical walls (webs) of concrete box girder bridges. Simulated voids with thicknesses of 1.5 in. to 4 in. and lengths (parallel to the tendon direction) ranging from 2 in. to 6 in. were located adjacent to steel prestressing strands in 4 in. diameter grouted HDPE ducts. The simulated voids were placed at depths of 2 in. to 6 in. beneath ...

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FINITE ELEMENT ANALYSIS OF PRESTRESSED CONCRETE VOIDED ...

circular, 41 in. diameter, voids extend-ing to within approximately 5 ft of the centerlines of support. End supports consist of four individ-ual flexible bearings. Both interior sup-ports consist of two circular columns each with pot bearings. The bridge deck is prestressed by eight sets of four post-tensioning cables arranged be-tween the voids.

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Detection of Sizes and Locations Air Voids in Reinforced ...

Detection of Sizes and Locations Air Voids in Reinforced Concrete Slab using Ground Penetrating Radar and Impact-Echo Methods ... Reinforced concrete is widely used in bridge construction in Malaysia1. The bridge deck is the most important structural component that is necessary to safely transfer the heavy traffic loads to the other members. The safety of a deck is important to be

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Detection of Voids, Soft Grout and Tendon Corrosion - NDT ...

Bridge owners recognize voids and soft grout in internal post tensioning ducts of bridges as a potential cause of tendon corrosion and a serious issue that they need to address. Nondestructive sonic/ultrasonic testing complimented with a drilling and bore scope inspection program can provide engineers with the specific locations of voids and soft grout, approximate volume of voids and an ...

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Axle detection on prestressed concrete bridge using bridge ...

22/02/2017  The experimental B-WIM test using FAD sensors by previous researchers on prestressed concrete I girder bridge yielded reliable responses; however, the frequency of vehicle parameter detection was questionable. On the prestressed concrete bridges, when the vehicle paths are near girders, the load gets transferred to the girder thus affecting the vehicle axle detection. Therefore, to

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Damage Detection and Condition Monitoring of Pre-stressed ...

Pre-stressed Concrete Bridges by using Vibration-based Health Monitoring Techniques K.S.D.M. Fernando, D.M.C.D. Dissanayake, M.A.K.M. Dharmasiri and A .J. Dammika Abstract: Damage detection plays a vital role in bridges as the structural performance of the bridges decreases progressively throughout their service life due to many deterioration processes. Although damage detection is

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Time Domain Reflectometry for Void Detection in Grouted ...

01/01/2003  The presence of voids is a serious problem in grouted posttensioned bridges because voids greatly reduce the corrosion-protective capabilities of the grout. Current methods for void detection suffe...

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Review of Active IR Thermography for Detection and ...

The method has been applied to the identification of internal voids, delaminations, and cracks in concrete structures such as bridge decks highway pavements parking garages, pipelines and other applications [10,20–22]. The ASTM standard [23] for detecting delaminations in concrete bridge decks using IRT was developed. This standard defines ...

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Detection of Voids in Prestressed Concrete Bridges using ...

Detection of Voids in Prestressed Concrete Bridges using Thermal Imaging and Ground-Penetrating Radar. David G. Pollock [0] Kenneth J. Dupuis [0] Benjamin Lacour [0] Karl R. Olsen [0] Cited by: 1 Views 1. Code: Data: Get fulltext within 24h. View via Publisher. Other Links . Bibtex. Mark. Full Text (Upload PDF) PPT (Upload PPT) Similar. Reference. Cited ...

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Detection of Simulated Voids in Grouted Ducts using ...

The concrete slab specimens were constructed to simulate typical walls (webs) of concrete box girder bridges. Simulated voids with thicknesses of 1.5 in. to 4 in. and lengths (parallel to the tendon direction) ranging from 2 in. to 6 in. were located adjacent to steel prestressing strands in 4 in. diameter grouted HDPE ducts. The simulated voids were placed at depths of 2 in. to 6 in. beneath ...

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FINITE ELEMENT ANALYSIS OF PRESTRESSED CONCRETE VOIDED ...

circular, 41 in. diameter, voids extend-ing to within approximately 5 ft of the centerlines of support. End supports consist of four individ-ual flexible bearings. Both interior sup-ports consist of two circular columns each with pot bearings. The bridge deck is prestressed by eight sets of four post-tensioning cables arranged be-tween the voids.

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ANALYSIS AND DESIGN OF VOIDED SLABBRIDGE

with permanent void formers or it can be precast prestressed concrete box beams post tensioned transversely to ensure continuity in the transverse direction. Fig. 1 Typical Voided Slab Bridge If the voids are in excess of 60%,their behavior becomes cellular .Incorporating voids in the deck increases the cost due to the complexity involved in the reinforcement designed to resist transverse ...

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Damage Detection and Condition Monitoring of Pre-stressed ...

Damage detection plays a vital role in bridges as the structural performance of the bridges decreases progressively throughout their service life due to many deterioration processes. Although damage detection is performed mainly through periodic visual inspection, due to its immense drawbacks, researchers have focused increasing attention to the potential of using vibrationbased structural ...

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Damage Detection and Condition Monitoring of Pre-stressed ...

Pre-stressed Concrete Bridges by using Vibration-based Health Monitoring Techniques K.S.D.M. Fernando, D.M.C.D. Dissanayake, M.A.K.M. Dharmasiri and A .J. Dammika Abstract: Damage detection plays a vital role in bridges as the structural performance of the bridges decreases progressively throughout their service life due to many deterioration processes. Although damage detection is

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Detecting Bridge Corrosion with a Robotic Magnetic-based ...

The research done in FHWA's NDE Laboratory in collaboration with the University of Wisconsin‐Milwaukee has led to the development of a state-of-the-art magnetic-based corrosion detection system for use in prestressed concrete bridge girders. The system has benefitted from incorporating the latest technology, design, fabrication, and software engineering techniques. FHWA

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Damage detection in prestressed concrete bridges based on ...

Damage detection in prestressed concrete bridges based on static load testing, sagging and modal parameters, using measurements and model updating: Language : English: Author, co-author : Schommer, Sebastian [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >] Publication date : 14-Jul-2017 : Institution : University of

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Review of Active IR Thermography for Detection and ...

The method has been applied to the identification of internal voids, delaminations, and cracks in concrete structures such as bridge decks highway pavements parking garages, pipelines and other applications [10,20–22]. The ASTM standard [23] for detecting delaminations in concrete bridge decks using IRT was developed. This standard defines ...

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BRIDGE ASSESSMENT METHODS USING IMAGE PROCESSING

NEXCO-West has developed a concrete crack detection technology using high quality digital image and image processing software (MATSUMOTO et. al.(2009) ). Sections of the concrete bridge elements are photographed by a motion-controlled digital camera from the fixed locations, or high definition video cameras through mobile carriers such as the inspectors, vehicles, or boats. Fig.1 shows the ...

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