Asphalt modifiers can improve high-end binder properties when using softer binders with RAP (recycled asphalt product) and RAS (recycled asphalt shingles).

Asphalt modifiers can improve high-end binder properties when using softer binders with RAP (recycled asphalt product) and RAS (recycled asphalt shingles).

• A. Not given
• B. True
• C. Cannot determine
• D. False

Answer: (B)

Using modifiers helps restore high-temperature performance when softer binders are used with RAP and RAS. The aged binder in RAP/RAS becomes stiff and brittle from oxidation, which can reduce rutting resistance at high temperatures. Introducing a softer virgin binder improves workability, but without modification the blend may still deform excessively under heavy traffic. Adding modifiers—such as polymers or elastomeric additives—can boost stiffness where needed while preserving elasticity, improve rutting resistance, and help the blended binder meet the required high-temperature performance grade. When the modifier is properly selected and dosed, the modified blend can achieve the desired high-end binder properties even with the presence of aged RAP/RAS.

Using modifiers helps restore high-temperature performance when softer binders are used with RAP and RAS. The aged binder in RAP/RAS becomes stiff and brittle from oxidation, which can reduce rutting resistance at high temperatures. Introducing a softer virgin binder improves workability, but without modification the blend may still deform excessively under heavy traffic. Adding modifiers—such as polymers or elastomeric additives—can boost stiffness where needed while preserving elasticity, improve rutting resistance, and help the blended binder meet the required high-temperature performance grade. When the modifier is properly selected and dosed, the modified blend can achieve the desired high-end binder properties even with the presence of aged RAP/RAS.