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39 CHAPTER FIVE REPAIR TPO repairs generally proceed as follows: The substrate surface is cleaned, usually by shot blasting. Sounding is normally conducted to find the extent of The same or similar overlay materials and application delamination. methods are used to replace the removed overlay (44). The perimeter of the distressed area of overlay is saw cut. In Alberta, aging TPOs subjected to wear and loss of skid The overlay inside the saw cut is removed using a small resistance have been successfully treated by applying the chipping hammer to minimize damage to the concrete asphaltic chip coats over the surfaces (48). substrate and surrounding overlay.