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.

 

A.    For the portion retained on the No. 4 (4.75 mm) sieve, meet the requirements of Table 4117.03-1 for coarse aggregate for concrete.

 

Table 4117.03-1: Aggregate Quality

Aggregate Quality

Maximum Percent Allowed

Test Method

Abrasion

40

AASHTO T 96

A Freeze

6

Office of Materials Test Method No. Iowa 211, Method A

Clay Lumps

0.5

Materials I.M. 368

 

B.    For the portion of Class V aggregate passing the No. 4 (4.75 mm) sieve, meet the requirements of Table 4117.03-2 for fine aggregate for concrete:

 

                            Table 4117.03-2: Fine Aggregate Quality

Fine Aggregate Quality

Test Limits

Test Method

Shale and Coal

2.0 % (maximum)

Materials I.M. 344

Mortar Strength

6000 psi (41.4 MPa) (minimum)

Office of Materials Test Method No. Iowa 212

 

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 4117.05-1 when Class V aggregate is used.

 

Table 4117.05-1: Cement Types and Substitutions

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

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20% Class C Fly Ash