Masonry Magazine February 2006 Page. 35
Infrared Thermography of a Masonry Building
pachometer survey or SPR survey to locate and evaluate reinforcement installation. Detailed information, such as positioning of reinforcement and splice lengths, cannot be determined with IRT alone.
In IRT, an infrared camera is used to detect relative differences in thermal radiation from a masonry surface. Hollow or insulated masonry cells act as a thermal barrier in masonry construction. Solidly grouted cells act as a heat sink and transmit the majority of the thermal energy through the masonry section. Because the majority of the heat is transmitted through a grouted cell, very little thermal energy is emitted back in the direction of the heat source. In short, hollow or insulated cells emit more energy than solid grouted cells.
An infrared camera detects these minute differences in emitted thermal energy. As a result, when viewed with an infrared camera, hollow cells are displayed in a sharp and distinct contrast to grouted cells. In examples in this publication, cells that are not grout-filled appear as lighter gray shades.
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The Voice of the Mason Contractor
February 2006
Masonry 33