Road American
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Rubber modification increases elasticity and strain recovery of the cured residue, allowing the filler to stretch and relax with joint movement instead of cracking. It can improve resistance to thermal cycling and minor substrate deformation, and it often enhances adhesion and water resistance at the crack interface. The tradeoffs are higher viscosity, tougher pumping and extrusion, and a greater need for controlled mixing and storage to avoid phase separation. Performance should be verified with low temperature flexibility, crack bridging tests, and aging or heat resistance evaluations aligned to service conditions.
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