Section 4117. Class V Aggregate for Portland Cement Concrete.
4117.01 DESCRIPTION.
A mixture of fine and coarse particles of feldspathic rocks from an approved
source as described in Materials I.M. 409.
4117.02 GRADATION.
Meet the gradation requirements for gradation No. 7 of the Aggregate Gradation Table,
Article 4109.02.
4117.03 QUALITY.
The portion retained on the No. 4 (4.75 mm) sieve shall meet the following requirements
for fine aggregate for concrete.
TABLE 4117.03 - 1 Aggregate Quality Maximum % Allowed Test Method Abrasion 40 AASHTO T 96 A Freeze 6 Iowa DOT Materials Laboratory Test Method 211, Method A Clay Lumps 0.5 Materials I.M. 368
The portion of Class V aggregate passing the No. 4 (4.75 mm) sieve shall meet the following requirements for fine aggregate for concrete:
TABLE 4117.03 - 2 Fine Aggregate Quality Test Limits Test Method Shale and Coal 2.0% (maximum) Materials I.M. 344 Mortar Strength (a) 1.5 (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 of less than 2.75.
4117.04 COMBINATIONS.
Use Class V aggregate for PC concrete only in combination with limestone as specified
in Materials I.M. 529. Acquire limestone
from sources meeting the specified coarse aggregate durability for PC concrete.
A. Fine Limestone.
Meet the gradation requirements for gradation No. 8 of the Aggregate Gradation Table, Article 4109.02.B. Coarse Limestone.
Meet the requirements of Section 4115.
4117.05 CEMENT REQUIREMENTS.
For Interstate and Primary projects, use the cement types and substitutions of Table 4117.05
when Class V aggregate is used.
TABLE 4117.05 Cement Type Min. Required Substitution Max. Allowable Substitution Type I, Type II 20% Class F Fly Ash 25% Class F Fly Ash Type I, Type II 25% GGBFS 35% GGBFS Type IS, IP --- 20% Class C Fly Ash