4131Porous Backfill Material

IA · 2023 Standard Specifications✓ Full text on BuildSpecBook pages 1097–1097 Save this section

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4131.01DESCRIPTION

Gravel or crushed stone.

4131.02GRADATION

Meet the requirements of Gradation No. 29 of the Aggregate Gradation Table, Article

4109.02

4131.03QUALITY

No visible clay lumps, friable particles, and clay coatings. Meet the requirements of Table 4131.03-1: Table 4131.03-1: Aggregate Quality (Porous Backfill Material) Aggregate Quality

Maximum Percent Allowed

Test Method

Abrasion

AASHTO T 96

Alumina(a, b)

0.7

Iowa DOT Materials Laboratory Test Method No. 222

A Freeze

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

Shale Materials I.M. 345

(a)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.

(b)Alumina does not apply to gravel.

Referenced in this section

4109Aggregate Gradations

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Source: Iowa Standard Specifications for Highway and Bridge Construction, 2023 Edition. Pages 1097–1097 of 1,288. View official source ↗

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4130 Revetment Stone, Erosion Stone, and Gabion Stone

4132 Special Backfill Material

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