3131Intermediate Aggregate for Concrete

3131.1SCOPE

Provide intermediate Aggregate for use in Portland cement concrete.

3131.2REQUIREMENTS

A General Provide intermediate 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 intermediate Aggregate for Portland cement concrete:

geological formations or deposits

the Concrete Engineer B Classification The Concrete Engineer classifies intermediate Aggregate as 100 percent of the Material passing the 1/2 inch sieve meeting the requirements of 3137.2B, “Classification.” Table 3131.2-1 designates the intermediate Aggregate as one of the following:

Table 3131.2-1 Intermediate Aggregate Gradations for Concrete Sieve Sizes Intermediate Aggregate Designation Percent by weight passing square opening Sieves Coarse Intermediate Aggregate (CIA) Fine Intermediate Aggregate (FIA) Coarse Sand (CS) Fine Sand (FS) 1/2 inch 100 100 100 100 3/8 inch - - 100 100 No. 4 0 – 90 91 – 100 0 – 90 91 – 100 No. 8 0 – 50 0 – 50 51 – 90 51 – 100 C Washing Wash the intermediate Aggregate. D Quality Provide CIA in accordance with 3137.2D, “Quality.” Provide FIA, CS and FS in accordance with 3126.2B, “Quality.” If the CIA is <15 percent of the total aggregate in the mix, Table 3137.2-3(b) is modified to a maximum of 50.0 percent by weight of Carbonate in Class C aggregate. E Gradation Proportion intermediate Aggregates with other Aggregate fractions to comply with a Specification requirement. Intermediate Aggregates do not have individual Sieve gradation requirements.

3131.3SAMPLING AND TESTING

A Preliminary Intermediate Aggregate Testing Sample and test intermediate Aggregate fractions separately in accordance with Table 3137.3-1. B Intermediate Aggregate Test Methods When proportioning CIA with a coarse Aggregate to meet the specified limits of #67 gradation, sample and test CIA in accordance with Table 3137.3-2. Using a minimum sample size equivalent to CA-70 per the Schedule of Materials Control. Sample and test all other CIA intermediate Aggregates in accordance with Table 3126.3-2. Sample and test FIA, FS, and CS in accordance with Table 3126.3-2.