NOW YOU SEE IT - RADAR, VIBRATION, AND THERMOGRAPHY AS INVESTIGATIVE TOOLS FOR STRUCTURES

A number of non-destructive testing methods exist for the investigation of defective structures including ultrasonic pulse velocity, half-cell potential, resistivity and concrete sample analysis. This paper describes three more specialised techniques which can provide further information. Impulse radar can identify the location and orientation of reinforcing bars and other structural details and find areas of water penetration. Specific repair applications and limitations are listed. Infra-red thermography or thermal imaging, employs a scanner containing a pre-cooled infra-red detector which detects temperature differences between areas. Recent developments include thermoelectric cooling without coolants, video recording and computer enhancement of the images. Various methods of vibration analysis are noted including ultrasonic pulse velocity, sonic logging, shock analysis and pulse echo techniques. Improvements in instrumentation and microprocessors and in understanding the response of structures has led to more use of natural frequencies and examples of these are given. Case studies are described using the above techniques. The author emphasises the need for a Materials Consultant to decide on the appropriate technique. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09595090
• Corporate Authors:

  Palladian Publications Limited

  14 Park Street
  Windsor, Berkshire,   England 
• Authors:
  • ROBERY, P
• Publication Date: 1990-5-6

Language

• English

Media Info

• Features: References;
• Pagination: p. 120-124
• Serial:
  • Intl J of Construction Maintenance and Repair
  • Volume: 4
  • Issue Number: 3
  • Publisher: Palladian Publications Limited
  • ISSN: 0959-5090

Subject/Index Terms

• TRT Terms: Case studies; Concrete structures; Infrared radiation; Nondestructive tests; Pulses; Radar; Sonic tests; Test procedures; Thermographs; Ultrasonics; Velocity; Velocity measurement; Vibration
• Uncontrolled Terms: Pulse velocity
• Old TRIS Terms: Sonic pulse velocity tests
• ITRD Terms: 4755: Concrete; 5255: Deterioration; 6797: Infrared; 6216: Non destructive testing; 6738: Radar; 6120: Sensor; 6288: Test method; 6739: Ultrasonic; 5558: Vibration
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00609907
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jun 30 1991 12:00AM