703Section 703

703.01 Fine Aggregate for Concrete . Fine aggregate for concrete shall conform to the

requirements of AASHTO M 6, Class A. The minimum sand equivalent, as tested per Colorado Procedure 37 shall be 80 unless otherwise specified. The fineness modulus, as determined by AASHTO T 27, shall not be less than 2.50 or greater than 3.50 unless otherwise approved.

703.02 Coarse Aggregate for Concrete . Coarse aggregate for concrete shall conform to the

requirements of AASHTO M 80, Class A, except that the percentage of wear shall not exceed 45 when tested per AASHTO T 96.

703.03 Aggregate for Bases . Aggregates for bases except Aggregate Base Course (RAP) shall

be crushed stone, crushed slag, crushed gravel, natural gravel, or crushed reclaimed concrete. Aggregate Base Course (RAP) shall be 100 percent crushed recycled asphalt pavement material. All materials except Aggregate Base Course (RAP ) shall conform to the quality requirements of AASHTO M 147 except that the requirements for the ratio of minus 75 µm (No. 200) sieve fraction to the minus 425 µm (No. 40) sieve fraction, stated in 3.2.2 of AASHTO M 147, shall not apply The requirements for the Los Angeles wear test (AASHTO T 96 and ASTM C535) shall not apply to Class 1, 2, and 3. Aggregates for bases shall meet the grading requirements of Table 703 -2 for the class specified for the project, unless otherwise specified. The liquid limit shall be as shown in Table 703 -2 and the plasticity index shall not exceed six when the aggregate is tested per AASHTO T 89 and T 90 respectively. 703.03 703- 3 Table 703 -2 CLASSIFICATION FOR AGGREGATE BASE COURSE Mass Percent Passing Square Mesh Sieves LL not greater than 35 NOTE: Class 3 material shall consist of bank or pit run material. LL not greater than 30 Sieve Size Class 1 Class 2 Class 3 150 mm (6") 100 100 mm (4") 100 75 mm (3") 95-100 60 mm (2 1/2") 100 50 mm (2") 95-100 37.5 mm (1 1/2”) 25 mm (1") 19 mm (3/4") 4.75 mm (#4) 30-65 2.36 mm (#8) 75 µm (#200) 3-15 3-15 20 max. Sieve Size Class 4 Class 5 Class 6 Class 7 150 mm (6") 100 mm (4") 75 mm (3") 60 mm (2 1/2") 50 mm (2") 100 37.5 mm (1 1/2”) 90-100 100 25 mm (1") 95-100 100 100 19 mm (3/4") 50-90 95-100 4.75 mm (#4) 30-50 30-70 30-65 2.36 mm (#8) 25-55 20-85 75 µm (#200) 3-12 3-15 3-12 5-15 703.04 703- 4 Aggregate Base Course (RAP) shall be 100 percent reclaimed asphalt pavement material conforming to the requirements of Table 703 -3 Table 703 -3 CLASSIFICATION FOR RECLAIMED ASPHALT PAVEMENT AGGREGATE BASE COURSE Mass Percent Passing Square Mesh Sieves Sieve Size ABC (RAP) 50 mm (2") 100 25 mm (1") 85-100 19 mm (3/4") 75-100 12.5 mm (1/2") 55-90 9.5 mm (3/8") 45-80 4.75 mm (#4) 25-55 1.18 mm (#16) 5-25 75 µm (#200) 0-5

703.04 Aggregates for Hot Mix Asphalt. Aggregates for hot mix asphalt (HMA) shall be of

uniform quality, composed of clean, hard, durable particles of crushed stone, crushed gravel, natural gravel, or crushed slag. Excess of fine material shall be wasted before crushing. A percentage of the aggregate retained on the 4.75 mm (No. 4) sieve for Gradings S, SX and SG — and on the 2.36 mm (No. 8) sieve for Gradings SF and ST —shall have at least two mechanically induced fractured faces when tested per Colorado Procedure 45. This percentage will be specified in Table 403 -1, as revised for the project in Section 403. The angularity of the fine aggregate shall be a minimum of 45.0 percent when determined according to AASHTO T 304. Grading SF mixes, when determined by the Region Materials Engineer , may not require fine aggregate angularity of 45.0 percent. Aggregate samples representing each aggregate stockpile shall be non -plastic if the percent of aggregate passing the 2.36 mm (No. 8) sieve is greater than or equal to 10 percent by weight of the individual aggregate sample. Plasticity will be determined per AASHTO T 90. The material shall not contain clay balls, vegetable matter, or other deleterious substances. The aggregate for Gradings ST , S, SX, and SG shall have a percentage of wear of 45 or less when tested per AASHTO T 96. 703.04 703- 5 Table 703 -4 MASTER RANGE TABLE FOR HOT MIX ASPHALT Percent by Weight Passing Square Mesh Sieves Sieve Size Grading SF Grading ST Grading SX Grading S Grading SG 37.5 mm (11/2″ ) 100 25.0 mm (1″ ) 100 90 – 100 19.0 mm (3/4 ″) 100 90 – 100 12.5 mm (1/2 ″) 100 90 – 100 * * 9.5 mm (3/8″ ) 100 90 – 100 * * * 4.75 mm (#4) 90 – 100 * * * * 2.36 mm (#8) * 28 – 58 28 – 58 23 – 49 19 – 45 1.18 mm (#16) 30 – 54 600 µm (#30) * * * * * 300 µm (#50) 150 µm (#100) 75 µm (#200) 2 – 12 2 – 10 2 – 10 2 – 8 1 – 7 Table 703 -4 Notes: * These additional Form 43 Specification Screens will initially be established using values from the As Used Gradation shown on the Design Mix. Aggregates for stone matrix asphalt (SMA) shall be of uniform quality, composed of clean, hard, durable particles of crushed stone, crushed gravel, or crushed slag. A minimum of 90 percent of the particles retained on the 4.75 mm (No. 4) sieve shall have at least two mechanically induced fractured faces when tested per Colorado Procedure 45. The particles passing the 4.75 mm (No. 4) sieve shall be the product of crushing rock larger than 12.5 mm ( 1/2 inch) and shall be non -plastic when tested per AASHTO T 90. Additionally, each source of aggregate for SMA shall meet the following requirements:

703.05 Aggregate for Cover Coat Material . Aggregates for cover coat material shall be

crushed stone, crushed slag, crushed gravel, or natural gravel. Aggregates shall be composed of clean, tough, durable fragments free from an excess of flat, elongated, soft, or disintegrated pieces and free from fragments coated with dirt or other objectio nable matter. Slag shall be air -cooled blast -furnace slag reasonably uniform in density. The aggregate shall conform to the following requirements:

703.06 Mineral Filler. Mineral filler shall conform to the requirements of AASHTO M 17 and

shall consist of rock dust, slag dust, hydrated lime, hydraulic cement, fly ash, or other suitable mineral matter. It shall be free of organic impurities and agglomerations. When used, it shall be dry enough to flow freely. Mineral filler shall be graded within the following limits: Table 703 -8 MINERAL FILLER GRADATION Sieve Size Mass Percent Passing Square Mesh Sieves 600 μm (No. 30) 100 300 μm (No. 50) 95-100 75 μm (No. 200) 70-100 Mineral filler shall have a plasticity index not greater than four excluding hydrated lime and hydraulic cement. 703.06 703- 8 If mineral filler other than limestone dust is used in stone matrix asphalt (SMA) it shall consist of mineral matter that meets the requirements of Tables 703 -8, 703- 9 and the following: Alternative mineral filler shall consist of finely divided mineral matter such as rock dust, slag dust, fly ash , loess, or other suitable mineral matter. Calcium oxide content of any mineral filler shall not exceed 22 percent. Alternative mineral filler test data shall be provided as part of the SMA mix design submittal and as required in Table 703 -10 during production. The Contractor shall sample and test alternative mineral filler at the frequencies listed in Table 703-9 . Production will be suspended if alternative mineral filler test results fail to meet requirements. The Contractor shall submit written plans to correct the mineral filler operation to the Engineer for approval before commencing paving . Table 703 -9 REQUIRED TESTING FOR ALTERNATIVE SMA MINERAL FILLERS Type of Test Contractor Testing Frequency Specification Limit Remarks Plasticity Index AASHTO T90 One per 10,000 tons of SMA placed ♦ 4% Maximum ▲ Hydrometer Analysis AASHTO T88 One at Mix Design submittal Report Gradation AASHTO T37 One per 10,000 tons of SMA placed ♦ Table 703- 10 ▲ Calcium Oxide Content ASTM C 25 One at Mix Design submittal 22% Maximum Modified Rigden Voids – NAPA Publication IS -101 One per 10,000 tons of SMA placed ♦ Shall not exceed 50 ▲ Table 703 -9 Notes: ♦ The minimum frequency shall be twice per project. ▲ Sampling of alternative mineral fillers shall be at the point of introduction to the SMA and a split sample shall be submitted to the Engineer. Table 703 -10 ALTERNATIVE SMA MINERAL GRADATION (AASHTO M17/ASTM D242- 95) Sieve Percent Passing 600 µm (#30) 100 300 µm (#50) 95 – 100 75 µm (#200) 70 – 100 703.07 703- 9 703.07 Bed Course Material.

703.08 Structure Backfill Material.

703.09 Filter Material. Filter material shall consist of free draining sand, gravel, slag, or

crushed stone. The grading requirements are set forth in Table 703 -14. Table 703 -14 GRADATION SPECIFICATIONS FOR FILTER MATERIAL Percent by Weight Passing Square Mesh Sieves Sieve Size Class A Class B Class C 75 mm (3") 100 37.5 mm (1 1/2") 100 19.0 mm (3/4") 20-90 100 4.75 mm (No. 4) 0-20 20-60 60-100 1.18 μ m (No. 16) 10-30 300 μ m (No. 50) 0-10 10-30 150 μ m (No. 100) 0-10 75 μm (No. 200) 0-3 0-3 0-3

703.10 Aggregate for Median Cover . Aggregate for median cover shall consist of clean

crushed stone, crushed gravel, or natural gravel. The percentage of wear, when tested per AASHTO T 96, shall not be more than 70. The grading requirements shall be as follows: Table 703 -15 GRADATION SPECIFICATIONS FOR MEDIAN COVER AGGREGATE Sieve Size Mass Percent Passing Square Mesh Sieves 63 mm (2 1/2 inch) 100 50 mm (2 inch) 95-100 19.0 mm (3/4 inch) 0-15 704.01 704- 1 SECTION 704 MASONRY UNITS

704.01 Clay or Shale Brick . Brick shall conform to the requirements of one of the following

specifications: Sewer and Manhole Brick -AASHTO M 91. Building Brick- AASHTO M 114.

704.02 Concrete Brick . Concrete brick shall confor m to the requirements of ASTM C 55.

704.03 Concrete Masonry Blocks . Concrete masonry blocks may be rectangular or segmented

and, when specified, shall have ends shaped to provide interlock at vertical joints. The blocks shall conform to the requirements of ASTM C139, o r, for hollow blocks, to ASTM C 90. Dimensions and tolerances shall conform to the above applicable requirements or those specified on the plans.

704.04 Masonry Mortar . Masonry mortar shall be Type S conforming to ASTM C270.