880 Page 528880 AGGREGATES FOR ASPHALT CONCRETE
880.1GENERAL REQUIREMENTS
The material will conform to the specifications for the particular material required by the contract. The material will not contain dirt, clay balls, vegetation or organic debris, paper, metal, glass, and other foreign material. The particles will be free from coating with clay or dust which prevents thorough coating with asphalt.
880.2SPECIFIC REQUIREMENTS
A.Reclaimed Asphalt Pavement (RAP): RAP will conform to the requirements of Section 884. B.Mineral Aggregate: The mineral aggregate job mix formula, without the addition of hydrated lime, will conform to the requirements shown in Table 1. The single percentage aggregate gradation established in the job mix formula for Class D, E, and G asphalt concrete mixes will be within the limits in Table 1. The single percentage aggregate gradation established in the job mix formula for Class S asphalt concrete mixes will be the center of the gradation band in Table 1. The Class S gradation will include mineral fillers or other approved additives. Table 1 Class D Class E Class G Class SRequirementsType 1Type 2Type 1Type 2Type 1Type 2Type 1*1Type 2*1 Sieve Percent Passing 1 inch 100 100 100 3/4 inch 97-100 100 97-100 100 97-100 100 100 5/8 inch 97-100 100 1/2 inch 75-95 97-100 75-95 97-100 75-95 97-100 86-100 97-100 3/8 inch 66-80 80-100 #4 45-75 60-80 45-75 60-80 45-75 60-80 24-34 24-45 #8 30-55 40-60 30-55 40-60 30-55 40-60 10-20 10-22 #16 20-45 25-50 20-45 25-50 20-45 25-50 #40 10-30 15-35 10-30 15-35 10-30 15-35 #200 3.0-7.0 4.0-8.0 3.0-7.0 4.0-8.0 3.0-7.0 4.0-8.0 6.0-10.0 4.0-8.0 Other Properties Processing Required Crushed Crushed Crushed Crushed Fine Aggregate Angularity (min) 41.5 42.5 44.0 NA Sand Equivalent (min) 42 45 50 NA LA Abra. Loss, (max) 45% 40% 35% 40% +#4Absorption (max)*21.0% Sodium Sulfate Soundness (Maximum) +#4 sieve 15% 15% 12% 8% -#4 sieve 15% 15% 12% 8% Lightweight Particles (Maximum) +#4 sieve 4.5% 3.0% 1.0% 1.0% -#4 sieve 4.5% 3.0% 1.0% 1.0% Crushed Particles (Minimum) +#4 sieve 50% 1-CF 70% 2-CF 90% 2-CF 95% 2-CF *1Mineral aggregate will be produced from a ledge rock source. *2Will be evaluated at mix design by the Department’s Central Materials Laboratory. 880 Page 529C.Classes D, E, and G: 1.Filler for mineral aggregate will consist of fine inert silt or stone dust, which is essentially free from lumps. The material will be fine enough that when pulverized for testing, 90% by dry weight will pass a #40 sieve and 60.0% by dry weight will pass a #200 sieve. The linear shrinkage will not exceed 4% and the plasticity index will not exceed 6. The material will be such that not more than 25% by volume will separate from asphalt in the presence of water. During production the filler will be screened over a screen of a size corresponding to the maximum size of the mineral aggregate. A larger size screen may be permitted, or a smaller size required, if necessary, to facilitate production or to remove objectionable material. Lumps will be pulverized prior to blending. 2.Mineral filler for mineral aggregate will consist of finely ground particles of stone, fly-ash, or Portland cement. Mineral filler will be thoroughly dry and free from lumps. Mineral filler will meet the following gradation requirements by dry weight when tested in accordance with AASHTO T 37: Sieve Size Percent Passing #4 100 #40 95 – 100 #80 85 – 100 #200 65.0 - 100 3.Hydrated lime will meet the requirements of Section 760. The maximum amount of hydrated lime allowed in the mixture will be 2% of the total weight of the mineral aggregate. D.Class S: Mineral filler, if needed, will meet the requirements of Section 880.2 C. The mixture will have a coarse aggregate skeleton with stone-on-stone contact meeting the requirements in Section 8 of AASHTO R 46 (Designing Stone Matrix Asphalt). The mixture will be evaluated for compliance at mix design by the Department’s Materials & Surfacing Office.
880.3SAMPLING AND TESTING
Sampling ............................................................................................................... SD 201 Gradation ............................................................................................................... SD 202 Fine Aggregate Angularity ..................................................................................... SD 217 Sand Equivalent ..................................................................................................... SD 221 LA Abrasion Test................................................................................................... SD 204 Linear Shrinkage (Filler) ........................................................................................ SD 303 Soundness Test (sodium sulfate solution, five cycles) .......................................... SD 220 W.A.P. Test (Filler) ................................................................................................ SD 304 Crushed Particle Test............................................................................................ SD 211 Particles Less Than 1.95 Specific Gravity ............................................. SD 208 & SD 214 Absorption .............................................................................................................. SD 210 881 Page 530881 AGGREGATES FOR ASPHALT SURFACE TREATMENTS
881.1GENERAL REQUIREMENTS
The material will conform to the specifications for the particular material required by the contract. The material will be sand, crushed rock or crushed gravel. The material will not contain dirt, clay balls, vegetation or organic debris, paper, metal, glass, and other foreign material.
881.2SPECIFIC REQUIREMENTS
REQUIREMENTS TYPE 1 TYPE 2 A B A B CTYPE 3 Sieve Percent Passing 5/8 inch 100 1/2 inch 100 3/8 inch 100 100 100 100 0-100 1/4 inch 25-70 0-70 #4 0-25 0-75 0-70 0-60 0-15 10-75 #8 0-5 0-30 0-28 0-18 0-5 0-62 #40 0-4 0-6 0-4 0-4 0-30 #200 0-1.3 0-3.0 0-3.0 0-1.3 0-1.0 0-10.0 Other Properties Flakiness Index (max) 30% 30% 30% 30% 30% Plasticity Index (max) 3 3 3 3 NP 3 LA Abrasion Loss (max) 40% 40% 40% 40% 40% 40% Soundness Loss (max) 12% 12% 12% 12% 12% 15% Crushed Particles (min) +#4 Sieve50% 2-CF 100% 2-CF 50% 2-CF 30% 1-CF Foot Notes*1*1*1*1*1 *1The plasticity index may be waived if not more than 4% of the material passes the #40 sieve.
881.3SAMPLING AND TESTING
Sampling ................................................................................................................ SD 201 Gradation ............................................................................................................... SD 202 Plasticity Index ....................................................................................................... SD 207 LA Abrasion Test................................................................................................... SD 204 Soundness Test (sodium sulfate solution, five cycles) .......................................... SD 220 Crushed Particle Test............................................................................................ SD 211 Flakiness Index Test.............................................................................................. SD 203