RAP binder replacement and blending chart

AASHTO M 323 · AASHTO R 35

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AASHTO M 323 · AASHTO R 35

Find the virgin binder a RAP content needs, or the RAP content a virgin binder allows, from the critical temperatures of the recovered RAP binder.

Find

Blended binder high grade

The grade the contract specifies for the blend.

Blended binder low grade

RAP in the mix, %

Binder content of the RAP, P_b,RAP, %

Percent by mass of the RAP (T 308 or T 164).

Total binder content of the mix, P_b, %

Recovered RAP binder

High, original DSR, °C

High, RTFO DSR, °C (optional)

Intermediate, PAV DSR, °C (optional)

Low, BBR stiffness, °C

Low, BBR m-value, °C (optional)

Virgin binder

Specification

Maximum binder replacement, % (optional)

Optional: your agency’s cap on RAP binder as a percent of the total binder.

Example values: NCHRP Report 452’s recovered RAP binder (a PG 82-10) at 30 percent, for a PG 64-22 blend.