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 (75 mm). Screen over a 3/4 inch (19mm) screen, or when specified in the contract documents, a 1 inch (25mm) screen. This is identified as Gradation No. 13 of the Aggregate Gradation Table, Article 4109.02.
B. The aggregate passing the 3/4 inch (19mm) or 1 inch (25 mm) screen may be furnished as the Choke Stone material; however, 6% to 16% of the material shall pass the No. 200 (75 μm) sieve.
A. For Macadam Stone Base and Choke Stone, meet the requirements of Table 4122.03-1 when crushed to a 3/4 inch (19 mm) or 1 inch (25 mm) nominal size for testing:
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Table 4122.03-1: Macadam Quality |
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Macadam Quality |
Maximum Percent Allowed |
Test Method |
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Abrasion |
50 |
AASHTO T 96 |
|
C Freeze |
10 |
Office of Materials Test Method No. Iowa 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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Table 4122.03-2: Choke Stone Quality |
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Choke Stone Quality |
Maximum Percent Allowed |
Test Method |
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Abrasion |
45 |
AASHTO T 96 |
|
C Freeze |
15 |
Office of Materials Test Method No. Iowa 211, Method C |