Section 4110. Fine Aggregate for Portland Cement Concrete.

4110.01 DESCRIPTION.
Natural sands resulting from disintegration of rock through erosional processes. Acquire mineral aggregate from an approved source as described in Materials I.M. 409.

4110.02 GRADATION.
Meet the requirements for Gradation No. 1 of the Aggregate Gradation Table, Article 4109.02.

4110.03 QUALITY.

TABLE 4110.03
Fine Aggregate Quality Test Limits Test Method
Shale and Coal 2.0% (maximum) Materials I.M. 344
Mortar Strength (a) 1.5 6000 psi (minimum) Iowa DOT Materials Laboratory
Test Method 212
Fineness Modulus 2.75 (minimum) Materials I.M. 302
(a) An annual mortar strength test result of 1.5 or greater is required for continued approval of a source with a fineness modulus less than 2.75.

The Engineer may require additional mortar strength testing for sources where quality changes.