Section 4117.  Granular Leveling Material

4117.01     DESCRIPTION.

· 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.

4117.02     GRADATION.

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.

4117.03     QUALITY.

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 Quality	Maximum Percent Allowed	Test Method
Abrasion	50	AASHTO T 96
C – Freeze ^(a)	20	Iowa DOT Materials Laboratory Test Method No. 211, Method C
A – Freeze ^(a)	6	Iowa DOT Materials Laboratory Test Method No. 211, Method A
Alumina ^(a)	0.5	Iowa DOT Materials Laboratory Test Method No. 222
(a) Meet at least one of the C- Freeze, A-Freeze, or Alumina requirements.