Several advanced techniques are used to evaluate the effectiveness of crack sealing operations, going beyond simple visual inspection. One technique is infrared thermography, which uses an infrared camera to detect temperature differences on the pavement surface. Properly sealed cracks will have a different thermal signature than unsealed or poorly sealed cracks, allowing for identification of areas where the sealant is failing. Another technique is ground-penetrating radar (GPR), which can be used to assess the depth and extent of the sealant within the crack, as well as to detect any voids or moisture....
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