Modified asphalt binder material using crumb rubber and methods of manufacturing a modified asphalt binder

A method for making a modified asphalt binder composition, comprising the steps of:

• a. providing neat asphalt in an appropriate vessel;
• b. heating the neat asphalt to a temperature of between about 120° C. and about 200° C.;
• c. adding to the neat asphalt a first modifying ingredient selected from the group consisting of at least one acid, at least one synthetic polymer and crumb rubber;
• d. mixing the asphalt and the first modifying ingredient with one of a high shear mixer or a low shear mixer for a period of between about 5 minutes and about 10 hours
• e. adding to the modified asphalt binder a second modifying ingredient selected from the group consisting of at least one acid, at least one synthetic polymer and crumb rubber, wherein the second modifying ingredient is a different type of ingredient than the first modifying ingredient;
• f. mixing the second modifying ingredient and the modified asphalt binder in one of a high shear mixer or a low shear mixer for a period of between about 5 minutes and about 10 hours
• g. adding to the modified asphalt binder a third modifying ingredient selected from the group consisting of at least one acid, at least one synthetic polymer and crumb rubber, wherein the third modifying ingredient is a different type of ingredient than the first modifying ingredient and the second modifying ingredient;
• and
• h. agitating the third modifying ingredient and the modified binder material in one of a low shear mixer or a high shear mixer for a period of between about 5 minutes and about 48 hours.