3137Coarse Aggregate for Concrete

3137.1SCOPE

Provide coarse Aggregate for use in Portland cement concrete.

3137.2REQUIREMENTS

A General Provide coarse Aggregate consisting of clean, sound, durable particles, uniform in quality, and free from wood, bark, roots, and other deleterious Material. The Engineer, in conjunction with the Concrete Engineer, may consider the following as the basis for acceptance of coarse Aggregate for Portland cement concrete:

geological formations or deposits

the Concrete Engineer B Classification Provide coarse Aggregate meeting the requirements of one of the following classifications:

including basalt, diabase, gabbro, and other igneous rock types. Class A Aggregate may contain no greater than 4.0 percent non-Class A Aggregate. The Department will not allow the intentional blending or adding of non-Class A Aggregate.

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conjunction with the Concrete Engineer, will determine the suitability of the Class D Aggregate for the proposed use including proportioning.

the Concrete Engineer, will determine the suitability of the Class R Aggregate for the proposed use, including proportioning. C Washing Wash Class B, Class C, Class D, and Class R coarse Aggregate to comply with the requirements of Table 3137.2-1(i). Wash Class A aggregate as needed to comply with the requirements of Table 3137.2-1(i), except always wash Class A aggregate for use in Concrete Pavement . D Quality Provide coarse and CIA intermediate Aggregate in accordance with 3137.2D.1,”Coarse Aggregate for General Use,” 3137.2D.2, “ Coarse Aggregate for Bridge Superstructure,” or 3137.2D.3, “Coarse Aggregate for Concrete Pavement,” and the following: For fractions greater than or equal to 1 inch, base quality requirements on the individual result for the intended use. For fractions that have 100 percent passing the 1 inch Sieve:

the intended use.

composite result for the intended use.

the composite result for the intended use except as modified by the following:

must meet the requirements of 3137.2D.1, “Coarse Aggregate for General Use”

fraction must meet the requirements of 3137.2D.1, “Coarse Aggregate for General Use” except the percent absorption by weight of class B Aggregate is modified to a maximum of 1.75 percent and the percent carbonate by weight of the class C Aggregate is modified to a maximum of 30.0 percent.

fraction must meet the requirements of 3137.2D.3, “Coarse Aggregate for Concrete Pavement,” except the percent carbonate by weight of the class C Aggregate is modified to a maximum of 35.0 percent. The Concrete Engineer may reject the proposed Aggregate proportions if the composite result is of borderline quality in accordance with 1503, “Conformity with Contract Documents.” Refer to Table 2461.2-5, Table 2461.2-6, Table 2461.2-7 and Table 2462.2-4 to determine the appropriate coarse Aggregate quality Specification for the intended use. D.1 Coarse Aggregate for General Use Provide coarse Aggregate in accordance with Table 3137.2-1 unless otherwise specified in the Contract.

Table 3137.2-1 Coarse Aggregate for General Use Quality Test Maximum Percent by Weight

Fraction retained on the 1/2 inch Sieve 0.4 Fraction retained on the No. 4 Sieve, as a percentage of the total Material 0.7

Fraction retained on the 1/2 inch Sieve 1.0 Fraction retained on the No. 4 Sieve, as a percentage of the total Material 1.5

Class A and Class B Aggregates # 1.5 Class C and Class D Aggregates § 1.0

* Includes the percentages retained by shale and soft iron oxide particles, plus other iron oxide particles, unsound cherts, pyrite, and other Materials with similar characteristics. ǁ Exclusive of shale, soft iron oxide particles, and total spall Materials . † For total spall Materials, use the percent in the total sample retained on the No. 4 Sieve. ‡ Thickness less than 25 percent of the maximum width. Length greater than 3 times the maximum width. # Each individual fraction at the point of placement consists of dust from fracture and free of soil (eg., clay and silt) and shale. § For each individual fraction at the point of placement. ** Loss at 5 cycles for any fraction of the coarse Aggregate. Do not blend Materials from multiple sources to obtain a fraction meeting the sulfate soundness requirement. D.2 Coarse Aggregate for Bridge Superstructure Provide coarse Aggregate in accordance with 3137.2D.1, “Coarse Aggregate for General Use,” except as modified by Table 3137.2-2.

Table 3137.2-2 Coarse Aggregate for Bridge Superstructure Quality Test Maximum Percent by Weight

Fraction retained on the 1/2 inch Sieve 0.2 Fraction retained on the No. 4 Sieve as a percentage of the total Material 0.3

Fraction retained on the No. 4 Sieve as a percentage of the total Material 0.5

use the percent in the total sample retained on the No. 4 Sieve † 3.0

* Includes the percentages retained by shale and soft iron oxide particles, plus other iron oxide particles, unsound cherts, pyrite, and other Materials with similar characteristics. ǁ Exclusive of shale, soft iron oxide particles, and total spall Materials. † For total spall Materials, use the percent in the total sample retained on the No. 4 Sieve. D.3 Coarse Aggregate for Concrete Pavement Provide coarse aggregate in accordance with 3137.2D.1, “Coarse Aggregate for General Use,” except as modified by Table 3137.2-3, for use in the following:

Table 3137.2-3 Coarse Aggregate for Concrete Pavement Quality Test Maximum Percent by Weight

E Gradation Provide coarse Aggregate in accordance with Table 3137.2-4 including sizes within the specified limits. For the purpose of the Work specified in 3137, “Coarse Aggregate for Concrete,” the Department defines coarse Aggregate as the uniform product of the producing plant, unless some sizes are removed to meet the gradation requirements. Do not use broken or non-continuous gradations. If the coarse Aggregate contains less than 100 percent passing the 1 inch Sieve, use at least 2 fractions to proportion the coarse Aggregate. Base gradation requirements on the composite value of the combined coarse Aggregates. If producing Class R Aggregate, remove reinforcing steel from the concrete and any concrete Material passing the No. 4 Sieve.

Table 3137.2-4 Coarse Aggregate Gradation Requirements for Concrete

Coarse Aggregate Designation percent by weight passing square opening sieves 2 3 4 7 8 Sieve Sizes #67*ǁ #7*ǁ #89* CA-70 CA-80 2 inch - - - - - 1 1/2 inch - - - - - 1 inch 100 - - - - 3/4 inch 90 – 100 100 - - - 5/8 inch - - - 100 - 1/2 inch - 90 – 100 100 85 – 100 - 3/8 inch 20 – 55 40 – 70 90 – 100 50 – 100 100 No.4 0 – 10 0 – 15 20 - 55 0 – 25 55 – 95 No.8 - - 5 – 30 - - No.16 - - 0 – 10 - - No.50 - - 0 - 5 - 0-5 * Gradation sizes designated per ASTM C33/C33M, Standard Specification for Concrete Aggregates, Table 3. ǁ #67 and #7 Gradations are MnDOT Modified.

3137.3SAMPLING AND TESTING

A Preliminary Coarse Aggregate Testing Sample and test coarse Aggregate fractions separately in accordance with Table 3137.3-1. Table 3137.3-1 Preliminary Coarse Aggregate Testing Aggregate Notification and Testing Requirement New source Notify the Engineer at least 30 Calendar Days before use. Perform new source concrete Aggregate testing. Previously tested Aggregate Notify the Engineer at least 14 Calendar Days before use. Perform additional testing as directed by the Engineer, in conjunction with the Concrete Engineer. B Coarse Aggregate Test Methods Sample and test coarse Aggregate in accordance with Table 3137.3-2.

Table 3137.3-2 Coarse Aggregate Test Methods Test Testing Method Sampling Concrete Manual Sieve analysis Concrete Manual Shale test Laboratory Manual Method 1207 Quantity of Material passing the No. 200 Sieve Concrete Manual Specific gravity and absorption Laboratory Manual Method 1204 Density AASHTO T 19 Standard Method of Test for Bulk Density (“Unit Weight”) and Voids in Aggregate, or Laboratory Manual Method 1211 Los Angeles Rattler loss AASHTO T 96 Standard Method of Test for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angel Machine Void content AASHTO T 19* or Laboratory Manual Method 1211 Deleterious Materials Laboratory Manual Method 1209 Soundness; magnesium sulfate Laboratory Manual Method 1219 Soft particles Laboratory Manual Method 1218 Flat or elongated pieces ASTM D4791, Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate Clay balls or lumps Concrete Manual * Base the void content on an oven-dry and compacted-by-rodding condition of the Aggregate and a value of 62.4 pounds per cubic foot for water.