4138.01 DESCRIPTION.
Cutback asphalts and liquid asphalts shall be of the grade specified and shall meet the following requirements:

Rapid Curing (RC) Medium Curing (MC) Slow Curing (SC)

AASHTO M 81 AASHTO M 82 AASHTO M 140

The spot test indicated in AASHTO M 81, M 82, and M 140 will not be required.

Antistrip additive for use with cutback asphalt, as required in Article 2307.02, B, 2, or when otherwise specified, shall be approved in accordance with Materials I.M. 491.16 and shall be added at the approved dosage rate. The treated cutback asphalt shall produce a positive result when tested in accordance with Iowa DOT Materials Laboratory Test Method No. 629.

In Table I of AASHTO M 81, the distillation test requirements shall be as follows:

Distillate, by volume to 374°F (190°C), shall be a minimum of 4% of the total distillate to 680°F (360°C).