4138.01
GENERAL REQUIREMENTS.
A.
Use the grade specified. Meet the following requirements: • Rapid Curing (RC) AASHTO M 81 • Medium Curing (MC) AASHTO M 82 • Slow Curing (SC) AASHTO M 140
B.
The spot test indicated in AASHTO M 81, M 82, and M 140 will not be required.
C.
When using antistrip additive with cutback asphalt, (as required in Article
2307.02, B, 2 or when specified otherwise) use an additive approved
according to Materials I.M. 491.16. Add at the approved dosage rate. Ensure the treated cutback asphalt produces a positive result when tested according to Iowa DOT Materials Laboratory Test Method No. 629.
D.
In Table 1 of AASHTO M 81, the distillation test requirements are as follows: Distillate, by volume to 374°F, to be a minimum of 4% of the total distillate to 680°F.
4140.02
Emulsified Asphalt
Source: Iowa Standard Specifications for Highway and Bridge Construction, 2023 Edition. Pages 1102–1103 of 1,288.