4123.01DESCRIPTION
Aggregate of the following Types: • Crushed stone, • Gravels for which 75% or more of the particles retained on the 3/8 inch sieve have at least one fractured face as defined in Materials I.M. 305, • Recycled pavements meeting Materials I.M. 210, or • Uniformly blended combinations of these materials with a maximum of 50% RAP. • Do not place RAP below high water table. 4123.02
GRADATION.
A.
Meet the requirements for Gradation No. 14 of the Aggregate Gradation Table, Article 4109.02.
B.
Process RAP to pass the 2 inch sieve.
C.
Uncrushed gravel and/or sand may be uniformly blended with crushed recycled pavement or crushed stone at a maximum rate of 50% to meet gradation requirements.
4123.03 A.
QUALITY. The requirements of Table 4123.03-1 apply to virgin materials:
Aggregate for Bituminous Sealcoat
4125.01
Table 4123.03-1: Aggregate Quality Aggregate Quality
Maximum Percent Allowed
Test Method
Abrasion
50
AASHTO T 96
C Freeze
Iowa DOT Materials Laboratory Test Method No. 211, Method C
B.
The requirements of Table 4123.03-1 apply to recycled PCC when the aggregate source is unknown as outlined in Materials I.M. 210.