![]() The increased elasticity of the binder allows the system to recover more readily from deformations than unmodified systems. ULTRAPAVE ® does this by increasing the elastic nature of the binder at high temperatures. The use of ULTRAPAVE ® SBR Latex Polymers helps reduce the frequency and severity of permanent deformation. RESISTANCE TO HIGH TEMPERATURE PERMANENT DEFORMATIONĪlthough the binder is not the primary cause of rutting and shoving in asphalt concrete pavements, it does play a significant role. A wide range of SBR Latex Polymers can be used in unique formulations with different asphalt cements to produce the ideal performance grade. The extensive testing capabilities of ULTRAPAVE ® are available to assist the customer in developing the best system. The Superpave binder (AASHTO MP1) performance grade requirements provide the materials engineer with better guidelines for creating the optimum polymer-modified asphalt cement. Presentations have been made to numerous Departments of Transportation, contractors and asphalt suppliers to assist these groups with understanding the specifications and use of SBR Latex Polymers to enhance the asphalt’s properties. ![]() With over 1,000 different binder systems characterized, the effect of SBR Latex Polymers on different asphalt binders is well understood. ULTRAPAVE ® has played a major role in the testing and understanding of these specifications. With the implementation of Superpave, a product of the Strategic Highway Research Program (SHRP), the use of rheological engineering properties to describe asphalt cement performance has become essential. PERFORMANCE-BASED BINDER SPECIFICATION TESTING A micro-network forms with the polymer producing enhanced rheological properties. As the latex is added, the polymer particles swell from the heat and solvating effects of the resins and oils in the asphalt. Heat and mechanical agitation with time produce a homogenous blend of polymer in the asphalt. (**Values are typical and not meant to be specifications.) The base polymer is also available in various molecular weights for improved asphalt compatibility if needed. As a result, the physical dispersion of the polymer particles is rapid and thorough. 5 microns), exposing a very high surface area to the asphalt for complete mixing. In latex form, the SBR particles are extremely small (averaging. ULTRAPAVE ® SBR Latex Polymers contain emulsion polymerized random copolymers of styrene and butadiene in a water-based system. ![]() PROPERTIES OF ULTRAPAVE ® SBR LATEX POLYMERS ![]() Increased resistance to load-associated fatigue cracking.Increased resistance to low temperature cracking.Increased resistance to rutting and shoving. ![]() ULTRAPAVE ® SBR easily blends with the asphalt to form a homogenous reinforced composite. ULTRAPAVE ® SBR Latex Polymers were created specifically for modifying asphalt binders. Asphalts modified with ULTRAPAVE ® SBR Latex Polymers offer the best method of improving binders for highway, street and airport paving and maintenance projects. Today’s increasing loads, greater traffic volume and the need for better, longer-lasting roads demand better service from paving materials. ULTRAPAVE ® SBR LATEX POLYMERS FOR ASPHALT MODIFICATION ![]()
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