Section 4133.� Granular Backfill Material

 

4133.01���� DESCRIPTION.

Crushed stone or natural sand and gravel.

 

4133.02���� GRADATION.

Meet the requirements for Gradation No. 32 of the Aggregate Gradation Table, Article 4109.02, except when used as backfill material under flowable mortar or as floodable backfill material.

 

4133.03���� QUALITY.

For crushed stone, meet the requirements of Table 4133.03-1:

 

Table 4133.03-1: Aggregate Quality (Granular Backfill Material)

Coarse Aggregate Quality

Maximum Percent Allowed

Test Method

Abrasion

55

AASHTO T 96

C Freeze

20

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

Total of Abrasion & C Freeze

65

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Clay Lumps and Friable Particles

4

Materials I.M. 368

 

4133.04���� BACKFILL material UNDER FLOWABLE MORTAR.

Use one of the following:

 

A.��� Natural sand complying with the requirements for Gradation No. 1 of the Aggregate Gradation Table, Article 4109.02, with a maximum of 4% passing the No. 200 (75 μm) sieve.

 

B.��� Porous Backfill Material complying with Section 4131.

 

C.��� Floodable Backfill Material complying with Section 4134.

 

D.�� Granular Subbase Material complying with Section 4121.