Section 4122. Crushed Stone Base Material
Crushed stone meeting the following requirements.
A. Produce Macadam Crushed Stone with a nominal maximum size of 3 inches. Screen over a 3/4 inch screen, or when specified in the contract documents, a 1 inch screen. This is identified as Gradation No. 13 of the Aggregate Gradation Table, Article 4109.02.
B. The aggregate passing the 3/4 inch or 1 inch screen may be furnished as the Choke Stone material; however, 6% to 16% of the material shall pass the No. 200 sieve.
A. For Macadam Stone Base and Choke Stone, meet the
requirements of Table 4122.03-1 when crushed
to a 3/4 inch or 1 inch nominal size for testing:
Table 4122.03-1: |
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Macadam Quality |
Maximum Percent Allowed |
Test Method |
Abrasion |
50 |
AASHTO T 96 |
C Freeze |
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Iowa DOT Materials Laboratory Test Method No. 211, Method C |
B. Choke Stone that is a byproduct
of the Macadam production need not be tested. For Choke Stone that is not a
byproduct of Macadam production, meet the requirements of Table 4122.03-2:
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