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 requirements of Table 4124.03-1 based on aggregate crushed to 3/4 inch (19 mm) nominal size.

 

Table 4124.03-1: Aggregate Quality (Slurry Mixtures)

Aggregate Quality

Maximum Percent Allowed

Test Method

Abrasion 

40

AASHTO T 96

A Freeze

10

Office of Materials Test Method No. Iowa 211, Method A

Alumina(a)

0.7

Office of Materials Test Method No. Iowa 222

Sand Equivalence

45 (Minimum)

AASHTO T 176

Organic Materials

0.01

Office of Materials Test Method No. Iowa 215

(a)   If the Alumina value fails, determine the A Freeze value for specification compliance. Office of Materials Test Method No. Iowa 222 does not apply to gravel.