APE April 2021 | Page 22

EXPERT ADVICE
• Transverse cracks occur perpendicular to the pavement centerline . Usually caused by shrinkage of the asphalt layer or reflection from an existing crack . They are not load-related .
• Reflection cracks form over joints or cracks in an overlay of a deteriorated asphalt pavement . The cracks form because of movement of the old pavement .
• Slippage cracks are crescent-shaped cracks which form because of low-strength asphalt mix or a poor bond between pavement layers . The cracks form due to the forces applied by turning or braking motion of vehicles .

The first signs of cracking will begin in the first 18-24 months .

“ Once a pavement has been installed it begins to degrade ,” stated Rick Stone , sales / business development manager , Maxwell Products , Inc ., Salt Lake City , Utah . “ Generally , the first signs of cracking will begin in the first 18-24 months . Hairline cracking
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