4124 Aggregate for Slurry Mixtures

Section 4124. Aggregate for Slurry Mixtures.

4124.01 DESCRIPTION.
Crushed stone

4124.02 GRADATION.
Meet the requirements for Gradation No. 22 or No. 23 (as specified in the contract documents) of the Aggregate Gradation Table, Article 4109.02.

4124.03 QUALITY.
Type 4 or better friction classification aggregate as shown in Materials I.M. T203. Meet the following requirements based on aggregate crushed to 3/4 inch nominal size.

TABLE 4124.03

Aggregate Quality Maximum Percent Allowed Test Method

Abrasion 40 AASHTO T 96

A Freeze 10 Iowa DOT Materials Laboratory Test Method 211, Method A

Alumina ^(a) 0.7 Iowa DOT Materials Laboratory Test Method 222

Sand Equivalence 45 (Minimum) AASHTO T 176

Organic Materials 0.01 Iowa DOT Materials Laboratory Test Method 215

^(a) If the Alumina value fails, the A Freeze value shall be determined for specification compliance. Iowa DOT Materials Laboratory Test Method 222 does not apply to gravel.

TABLE 4124.03
Aggregate Quality	Maximum Percent Allowed	Test Method
Abrasion	40	AASHTO T 96
A Freeze	10	Iowa DOT Materials Laboratory Test Method 211, Method A
Alumina ^(a)	0.7	Iowa DOT Materials Laboratory Test Method 222
Sand Equivalence	45 (Minimum)	AASHTO T 176
Organic Materials	0.01	Iowa DOT Materials Laboratory Test Method 215
^(a) If the Alumina value fails, the A Freeze value shall be determined for specification compliance. Iowa DOT Materials Laboratory Test Method 222 does not apply to gravel.