FEATURE
For contractors , the questions they grapple with are how do cracks initially form , what are the ramifications if not addressed quickly , and what are the best ways to seal cracks ? “ In most cases , asphalt is installed over the top of a base layer that is constructed of rock , sand , and clay fines ,” stated Ben Thielbar
director of sales , Cimline , Inc ., Plymouth , Minnesota . “ The base layer is formulated in such a way that those ingredients when compacted work together to lock in as a structure that can support the weight of an asphalt layer , still be somewhat flexible , allow weight distribution from traffic above it , and provide a median for water to flow away from the asphalt mat structure .” When asphalt pavements is first placed , it is most resistant to cracking because it is at its most flexible . “ Over time the asphalt concrete mix becomes less flexible and cracks can form ,” said Chris M . Vacca , senior marketing manager , Crafco , Inc ., Chandler , Arizona .
Cars and trucks pound the pavement — any weakness in the structure of the pavement fracture or crack .
“ Cracks can form due to :
• Thermal Movement – Expansion and contraction due to temperature changes . Is a single-day temperature can change as much as 100 degrees in some areas .
• Traffic Loads – Cars and trucks pound the pavement — any weakness in the structure of the pavement fracture or crack .
• Age and Oxidation – As pavement ages , it loses flexibility and cohesion within the
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