A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
This project developed a method based on the technique of active heating infrared thermography for detecting delamination and deterioration in bridge decks. A review of infrared thermography was conducted with special reference to the nondestructive evaluation of civil structures. An evaluation of available equipment was carried out with reference to layout and configurations available for pavement heaters, the quantity of heat output, and the ability to control this output. Analytical studies employed a thermal/mechanical model of the medium to evaluate its thermal and mechanical responses to proposed thermal inputs. The model incorporated geometric and material property variations to determine their effectiveness. The studies showed that detectable differentials can be produced using the output of a standard pavement heater with 5-10 seconds of heating application. The analytical studies were coordinated with laboratory studies. A 4 foot by 8 foot by 7.25 in. thick laboratory test slab was built with simulated delaminations incorporated at different locations and depths. Ten-second heating tests were carried out on this slab using the same type of commercial heating equipment that would be used on a full-scale deck. The infrared data collected on the heated slab showed detectable temperature differentials at the delaminated locations proving the feasibility of using an active infrared system for bridge decks. A cost analysis shows the active infrared method to be less than half the cost of chain dragging method and performed in one-tenth of the time.
This project developed a method based on the technique of active heating infrared thermography for detecting delamination and deterioration in bridge decks. A review of infrared thermography was conducted with special reference to the nondestructive evaluation of civil structures. An evaluation of available equipment was carried out with reference to layout and configurations available for pavement heaters, the quantity of heat output, and the ability to control this output. Analytical studies employed a thermal/mechanical model of the medium to evaluate its thermal and mechanical responses to proposed thermal inputs. The model incorporated geometric and material property variations to determine their effectiveness. The studies showed that detectable differentials can be produced using the output of a standard pavement heater with 5-10 seconds of heating application. The analytical studies were coordinated with laboratory studies. A 4 foot by 8 foot by 7.25 in. thick laboratory test slab was built with simulated delaminations incorporated at different locations and depths. Ten-second heating tests were carried out on this slab using the same type of commercial heating equipment that would be used on a full-scale deck. The infrared data collected on the heated slab showed detectable temperature differentials at the delaminated locations proving the feasibility of using an active infrared system for bridge decks. A cost analysis shows the active infrared method to be less than half the cost of chain dragging method and performed in one-tenth of the time.
Active Heating Infrared Thermography for Detection of Subsurface Bridge Deck Deterioration. Highway IDEA Project 101
K. Maser (author)
2004
36 pages
Report
No indication
English
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