Article Article
Modeling of Environmental Effects on Thermal Detection of Subsurface Damage in Concrete

A significant form of deterioration in concrete is corrosion of embedded reinforcing steel that can cause subsurface delaminations and spalling. Infrared thermography can be used to detect delaminations based on variations in surface temperature that are caused by the disruption of the heat flow through the delaminated area. The surrounding environmental conditions such as sunlight, ambient temperature variation, and wind speed are critical for heat transfer, and as such the technology depends on these environmental conditions. This paper describes a numerical model developed to predict thermal contrasts for subsurface delaminations based on a given set of environmental conditions surrounding the concrete. The finite element method (FEM) was used to perform 3-D nonlinear transient heat-transfer analysis of a large concrete block with embedded Styrofoam targets intended to provide an idealized model of subsurface delaminations. The effectiveness of the modeling was evaluated by comparing the thermal contrasts predicted by the model and those obtained from experimental testing of an actual concrete block of the same dimensions. The correlation and error between the experimental testing and the model results indicated that the model could be an effective tool for the prediction of anticipated thermal contrasts based on given weather conditions.

1. L. Bertolini, B. Elsener, P. Pedeferri, and R. Polder. Corrosion of Steel in Concrete. 1st ed. Wiley-VCH, Weinheim, Germany (2004). 2. K. R. Maser and W. M. K. Roddis. Journal of Transportation Engineering 116:583–601 (1990). 3. H. G. Russell. Project 20-5 FY 2002 (Topic 34-09). Washington, D.C. (2004). 4. A. Ghorbanpoor and N. Benish. Project No. 0092-00-15. Milwaukee, WI (2003). 5. K. L. Rens, C. L. Nogueira, and D. J. Transue. Journal of Performance of Constructed Facilities 19:3–16 (2005). 6. W. M. K. Roddis. Master’s Thesis. Massachusetts Institute of Technology (1987). 7. M. E. Moore, B. M. Phares, B. A. Graybeal, D. D. Rolander, and G. Washer. FHWA-RD-01-020. Washington, D.C. (2001). 8. M. Scott, A. Rezaizadeh, A. Delahaza, C. G. Santos, M. Moore, B. Graybeal, and G. Washer. NDT & E Int. 36(4):245–255 (2003). 9. L. D. Olson, Y. Tinkey, and P. Miller. Concrete Bridge Condition Assessment with Impact Echo Scanning. in GeoHunan 2011 Emerging Technologies for Material, Design, Rehabilitation, and Inspection of Roadway Pavements. ASCE, Hunan, China (2011). 10. C. Maierhofer. J. Mater. Civ. Eng. 15:287–297 (2003). 11. R. Parrillo, A. Haggan, and R. Roberts. In 9th European NDT Conference (ECNDT), Berlin, Germany (2006). 12. G. G. Clemena and W. T. McKeel, Jr. The Applicability of Infrared Thermography in the Detection of Delamination in Bridge Decks VHTRC 78-R27. Virginia (1977). 13. G. J. Weil. In CRC Handbook on Nondestructive Testing of Concrete. CRC Press: Boca Raton, FL (1991). 14. D. G. Manning and F. B. Holt. Concr. Int. 2:34–41 (1980). 15. D. G. Manning and F. B. Holt. The development of deck assessment by radar and thermography. Transportation Research Record 1083 (1986). 16. ASTM. D4788-03: Standard test method for detecting delaminations in bridge decks using infrared thermography. Report (OR 10.007). West Conshohocken, PA (2007). 17. G. Washer, R. G. Fenwick, and N. K. Bolleni. MoDOT: Missouri Department of Transportation, Jefferson City, MO (2009). 18. F. A. Branco and P. A. Mendes. Journal of Structural Engineering 119:2313–2331 (1993). 19. G.Washer, R. G. Fenwick, N. K. Bolleni, and J. Harper. Journal of the Transportation Research Board 2108:107–114 (2009). 20. G. Washer, R. G. Fenwick, and N. K. Bolleni. Journal of Bridge Engineering 15:384–390 (2010).
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