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1016-1 DESCRIPTION

Select material shall be any suitable material which is classified by gradation and performance characteristics as shown in this section. Select material shall be used when called for on the plans or as stated in the specifications.

1016-2 USES

Select material may be specified for use in:

Subgrade

Slope and shoulder embankment

Backfill in undercut

Rock embankment in open water

Core material

Material placement over fabric

Foundation conditioning

Bedding material

Pipe backfill

The contractor may, with written approval of the Engineer, substitute a higher class of material than stated in the plans or specifications. No additional compensation will be made to the contractor as a result of such substitution.

1016-3 CLASSIFICATIONS

CLASS I

Select Material shall be a silty or clayey soil material which meets the requirements of AASHTO M145 for soil classification A-4. Soil materials which meet the requirements of AASHTO M145 for soil classification A-2, A-5, A-6 and A-7 will also be acceptable provided such materials do not have a liquid limit (LL) greater than 50, nor a plasticity index (PI) of less than 7 or greater than 20.

CLASS II

Type 1 - Select Material shall be a fine aggregate material consisting of crushed stone screenings (washed or unwashed) meeting the following gradation:

Sieve % Passing

3/8 in. 100

#4 80 - 100

#10 65 - 95

#40 25 - 55

#200 0 - 20

Type 2 - Select Material shall be a granular soil material meeting the requirements of AASHTO M145 for soil classifications A-2-4 with a maximum PI of 6 and A-4 soil containing 45% maximum passing a No. 200 sieve and a maximum PI of 6.

When a type is not specified, either type may be used, but no additional compensation will be made.

CLASS III

Type 1 - Select Material shall be a natural or manufactured fine aggregate material meeting the gradation requirements of standard size No. 2S or 2MS in Table 1005­2.

Type 2 - Select Material shall be a granular soil material meeting the requirements of AASHTO M145 for soil classification A­1 or A­3.

When a type is not specified, either type may be used, but no additional compensation will be made.

CLASS IV

Select Material shall be a coarse aggregate material meeting the gradation requirements of standard size No. ABC in Table 1005­1.

CLASS V

Select Material shall be a coarse aggregate material meeting the gradation requirements of standard size No. 78M in Table 1005­1.

CLASS VI

Select Material shall be a coarse aggregate material meeting the gradation requirements of standard size No. 57 in Table 1005­1.

Class VII

Select Material shall be a clean, unweathering, durable, blasted rock material. (No rippable rock will be permitted). The rock material shall have the following gradation:

A. At least 50% of the rock shall have a diameter of from 1 1/2 feet to 3 feet.

B. 40% of the rock shall range in size from 2 inches to 1 1/2 feet in diameter.

C. Not more than 10% of the rock shall be less than 2 inches in diameter.