4122Crushed Stone Base Material

IA · 2023 Standard SpecificationsBook pages 1088–1089View official source ↗

4122.01DESCRIPTION

Crushed stone meeting the following requirements.

4123.03

Modified Subbase Material

4122.02

GRADATION.

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.

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.

4122.03QUALITY

For Macadam Stone Base and Choke Stone, meet the requirements of Table

Table 4122.03-1: Crushed Stone Base Quality Macadam Quality

Maximum Percent Allowed

Test Method

Abrasion

AASHTO T 96

C Freeze

Iowa DOT Materials Laboratory Test Method No. 211, Method C

Source: Iowa Standard Specifications for Highway and Bridge Construction, 2023 Edition. Pages 1088–1089 of 1,288.

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4121 Granular Subbase Material

4123 Modified Subbase Material

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