PG continuous grade and ΔTc

AASHTO R 29 · AASHTO M 320 · ASTM D7643

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PG continuous grade and ΔT_c

AASHTO R 29 · AASHTO M 320 · ASTM D7643

Enter each property at two test temperatures, one passing and one failing if you can. The critical temperature is where the property crosses its criterion. The DSR rows are optional; the BBR rows give the low grade and ΔTc.

Original binder: DSR G*/sin δ

Test temperature 1, °C (optional)

Original G*/sin δ at temperature 1, kPa (optional)

Test temperature 2, °C (optional)

Original G*/sin δ at temperature 2, kPa (optional)

RTFO residue: DSR G*/sin δ

Test temperature 1, °C (optional)

RTFO G*/sin δ at temperature 1, kPa (optional)

Test temperature 2, °C (optional)

RTFO G*/sin δ at temperature 2, kPa (optional)

PAV residue: DSR G* sin δ

Test temperature 1, °C (optional)

PAV G* sin δ at temperature 1, kPa (optional)

Test temperature 2, °C (optional)

PAV G* sin δ at temperature 2, kPa (optional)

PAV residue: BBR creep stiffness S(60)

Test temperature 1, °C

S(60) at temperature 1, MPa

Test temperature 2, °C

S(60) at temperature 2, MPa

PAV residue: BBR m-value m(60)

Test temperature 1, °C

m(60) at temperature 1

Test temperature 2, °C

m(60) at temperature 2

PAV residue: DSR G* sin δ

G* sin δ criterion

Specification

Minimum ΔT_c, °C (optional)

Optional. Researchers have suggested −2.5 °C as a warning after 20 hours of PAV aging and −5.0 °C as a failure limit after 40 hours (FHWA HIF-21-042).

Example values: the BBR results are the FHWA ΔTc tech brief’s example; the DSR results are made up.

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