4133.01DESCRIPTION
Crushed stone or natural sand and gravel. If approved by the Engineer, manufactured sand may be substituted in applications where drainage is not a purpose for use of the granular material.
4133.02GRADATION
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.
4133.03QUALITY
For crushed stone, meet the requirements of Table 4133.03-1: Table 4133.03-1: Aggregate Quality (Granular Backfill Material) Maximum Percent Coarse Aggregate Quality Test Method Allowed Abrasion
55
C Freeze
Total of Abrasion & C Freeze
65
AASHTO T 96 Iowa DOT Materials Laboratory Test Method No. 211, Method C ---
Clay Lumps and Friable Particles
Materials I.M. 368
4136.02
Joint Fillers, Sealers, and Seals
4133.04BACKFILL 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 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.
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