4124Aggregate for Slurry Mixtures

4124.01DESCRIPTION

Crushed stone.

4124.02GRADATION

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

4124.03QUALITY

Type 4 or better friction classification aggregate as shown in Materials I.M. T203. Meet the requirements of Table 4124.03-1 based on aggregate crushed to 3/4 inch nominal size. Alumina d oes not apply to gravel.

Table 4124.03-1: Aggregate Quality (Slurry Mixtures) Maximum Percent Aggregate Quality Test Method Allowed Abrasion AASHTO T 96 A Freeze

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

Alumina(a, b)

0.7

Iowa DOT Materials Laboratory Test Method No. 222

Sand Equivalence

45 (Minimum)

Organic Materials

0.01

(a)

(b)

AASHTO T 176 Iowa DOT Materials Laboratory Test Method No. 215

If the Alumina value passes, the A-Freeze is not needed for specification compliance. If the Alumina value fails, determine the A Freeze value for specification compliance. Alumina does not apply to gravel.