Method of rejuvenating road surfaces with polymer modified asphalt emulsions
View Patent ↗A composition for rejuvenating asphalt pavement according to the present invention comprises an asphalt binder, water, a cationic surfactant, a recycling agent, and a cationic, co-agglomerated styrene butadiene rubber latex, which includes sulfur and a vulcanizing agent. The composition is also useful as a scrub seal, fog seal, sand seal as well as for crack filling and the prevention of reflective cracking. The inventive composition may be used in emulsions with different setup times. The invention also includes a method for treatment of aged and cracked asphalt by application of the disclosed compositions.
1. A method for rejuvenating deteriorated asphalt pavement comprising applying to deteriorated asphalt pavement a composition comprising an aqueous dispersion of asphalt, a surfactant, a recycling agent, and a co-agglomerated styrene butadiene rubber latex and vulcanizing agent, and drying the dispersion, wherein the complex modulus of the dried composition is 2.3 kPa at 50° C. after 3 days curing at 60° C.
2. The method of claim 1 in which said deteriorated asphalt pavement is cracked.
3. The method of claim 1 in which said surfactant is cationic.
4. The method of claim 1 in which said latex further comprises sulfur.