Polymer modified asphalt emulsions for treatment of road surfaces

Abstract

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.

I claim:  
     
         1 . A composition for rejuvenating asphalt pavement comprising, 
 a. asphalt,    b. a cationic surfactant,    c. a recycling agent, and    d. a co-agglomerated styrene butadiene rubber latex.    
     
     
         2 . The composition for rejuvenating asphalt paving of  claim 1  further comprising sulfur.  
     
     
         3 . The composition for rejuvenating asphalt paving of  claim 1  further comprising a vulcanizing agent.  
     
     
         4 . The composition for rejuvenating asphalt pavement of  claim 1 , wherein the viscosity of a mixture of the recycling agent and asphalt is between 1,000 and 3,000 centipoise.  
     
     
         5 . An asphalt emulsion comprising a co-agglomerated styrene butadiene rubber latex.  
     
     
         6 . The asphalt emulsion of  claim 5  further comprising a cationic surfactant.  
     
     
         7 . The asphalt emulsion of  claim 5  further comprising a vulcanizing agent.  
     
     
         8 . The asphalt emulsion of  claim 7  wherein the vulcanizing agent is diphenylguanidine.  
     
     
         9 . The asphalt emulsion of  claim 5  further comprising a dispersion of elemental sulfur.  
     
     
         10 . An asphalt emulsion for treatment of aged and cracked asphalt prepared by a method comprising 
 a. generating free radicals in a stream of soap    b. and activating a redox initiator system.    
     
     
         11 . The asphalt emulsion of  claim 10 , further comprising a redox initiator system comprising a reducing agent, and a water soluble metal salt.  
     
     
         12 . The asphalt emulsion of  claim 11  wherein the water soluble metal salt is selected from the group consisting of iron, copper, cobalt, nickel, tin, titanium, vanadium, manganese, chromium and silver.  
     
     
         13 . The asphalt emulsion of  claim 12  wherein the reducing agent is sodium formaldehyde sulfoxylate dihydrate.  
     
     
         14 . A method for producing latices which contain both rigid domains and rubbery domains by agglomerating latex particles with another solids dispersion.  
     
     
         15 . A method for preparing a polymer modified asphalt emulsion comprising by agglomerating a first dispersion of SBR latex with a second dispersion that includes sulfur and a vulcanizing agent.  
     
     
         16 . The method of  claim 15 , wherein the second dispersion comprises diphenylguanidine and elemental sulfur.  
     
     
         17 . A method for preventing reflective cracking comprising the application of a thin film of the composition of  claim 1  hereof.  
     
     
         18 . A method for the rejuvenation of aged and cracked asphalt surfaces comprising application of the composition of  claim 1.