Section 4123. Modified Subbase Material
Aggregate of the following Types:
· Crushed stone,
· Gravels for which 75% or more of the particles retained on the 3/8 inch (9.5 mm) sieve have at least one fractured face as defined in Materials I.M. 305,
· Recycled pavements meeting Materials I.M. 210, or
· Uniformly blended combinations of these materials with a maximum of 50% RAP.
A. Meet the requirements for Gradation No. 14 of the Aggregate Gradation Table, Article 4109.02.
B. Process RAP to pass the 2 inch (50 mm) sieve.
C. Uncrushed gravel and/or sand may be uniformly blended with crushed recycled pavement or crushed stone at a maximum rate of 50% to meet gradation requirements.
A. The requirements of Table 4123.03-1 apply to blended and non-blended virgin materials:
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Table 4123.03-1: Aggregate Quality (Blended and Non-blended Virgin Materials) |
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Aggregate Quality |
Maximum Percent Allowed |
Test Method |
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Abrasion (a) |
45 |
AASHTO T 96 |
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C Freeze |
15 |
Office of Materials Test Method No. Iowa 211, Method C |
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Alumina (b) (No. 40 (425 μm) material) |
4.7 |
Office of Materials Test Method No. Iowa 222 |
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(a) Virgin material with Al2O3 not exceeding 0.7 (+4) or A-freeze not exceeding 10 may have an abrasion maximum of 55. (b) For gravel or gravel/non-gravel blend, have a plasticity index not exceeding 7 for each source. |
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B. Acquire gravel or gravel/non-gravel blend products from a gravel source with a plasticity index not exceeding 7.