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. This is identified as Gradation No. 13b of the Aggregate Gradation Table, Article 4109.02.
For Macadam Stone Base and Choke Stone, meet the requirements of Table 4122.03-1:
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Table 4122.03-1: Crushed Stone Base Quality |
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Macadam Quality |
Maximum Percent Allowed |
Test Method |
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Abrasion |
50 |
AASHTO T 96 |
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C Freeze |
15 |
Iowa DOT Materials Laboratory Test Method No. 211, Method C |