4117.01DESCRIPTION
• Crushed stone, crushed gravel, or natural sand. • Produce crushed gravel as a separate operation by crushing the gravel particles retained on a screen at least 1/4 inch larger than the top aggregate size specified. Natural sand does not require crushing.
4117.02GRADATION
Meet the requirements for either Gradation No. 18, Gradation No. 19 or Gradation 21 of the Aggregate Gradation Table, Article 4109.02. Natural sand must meet the requirements for Gradation No. 18 only.
4117.03QUALITY
The requirements of Table 4117.03-1 apply to individual coarse aggregates and the parent material of the manufactured sand. Table 4117.03-1: Coarse Aggregate Quality Coarse Aggregate Maximum Percent Test Method Quality Allowed Abrasion
50
AASHTO T 96
C – Freeze (a)
Iowa DOT Materials Laboratory Test Method No. 211, Method C
A – Freeze (a)
Iowa DOT Materials Laboratory Test Method No. 211, Method A
Alumina (a)
0.5
Iowa DOT Materials Laboratory Test Method No. 222
4119.03
Bedding and Backfill Material for Interstate and Primary Road Projects.