Ensure that the aggregate, when combined at the job mix formula meets applicable Subsection 701.03.1 requirements. In addition to the applicable Subsection 701.03.1 requirements, ensure course aggregate absorption is 4 percent maximum as tested by MT 204. Aggregate Requirements. Furnish aggregate from sources meeting the applicable Section 106 requirements. Meet the aggregate gradation requirements shown in Table of Gradation – Aggregate Plant Mix Seal Course below as tested by MT 202. Aggregate must not contain adherent films of clay and other matter that prevents thorough coating and adhesion with bituminous material. Meet the following aggregate requirements at the job mix formula combined ratio: Coarse Aggregate (No. 4 (4.75 mm) and larger) Angularity (MT 217 or ASTM D-5821) 90% min. w/ 2 fractured Wear (MT 209 or AASHTO T-96) 30% max. Flat and Elongated Particles (ASTM D-4791) (5:1 Ratio; by mass; No. 4 (4.75 mm) and larger) 10% max. Fine Aggregate (No. 8 (2.36 mm) and smaller) Angularity (AASHTO T-304 Method A) 40% min. Sand Equivalent (MT 213 or AASHTO T-176) 45% min. If aggregate cannot meet the Sand Equivalent, meet the following: Volume Swell, untreated aggregates (MT-305) 10% max. Aggregate must be non-plastic (MT-208 or AASHTO T-89 & T-90) Asphalt Cement. Furnish performance asphalt binder (PGAB) meeting Section 702, Table 702-2 and the grade specified in the contract. Ensure PG 64-28, and PG 70-28 binders, after aging in the Rolling Thin Film Oven, and testing under AASHTO T 51 meet the following: Pull Rate: 5 cm/minute
#8 (2.36 mm) 65-90 #8 (2.36 mm) 45-70 #16 (1.18 mm) 45-70 #16 (1.18 mm) 28-50 #30 (0.600 mm) 30-50 #30 (0.600 mm) 19-34 #50 (0.300 mm) 18-30 #50 (0.300 mm) 12-25 #100 (0.150 mm) 10-21 #100 (0.150 mm) 7-18 #200 (0.075 mm) 5-15 #200 (0.075 mm) 5-15 Determine additive quantities during the laboratory mix design. Provide manufacturer certifications and recommended dosage rates for each additive shipment used on the project. Use of additives not included in the laboratory mix design requires a new laboratory mix design unless determined otherwise by the Project Manager. Perform the microsurfacing mix design in accordance with ASTM D6372 modified to include the following ISSA Specifications. Restrict the residual asphalt cement to 7.5 ± 2 percent by total dry weight of aggregate. ISSA SPECIFICATIONS ISSA TEST NO. DESCRIPTION SPECIFICATION ISSA TB-139 Wet Cohesion @ 30 Minutes Minimum (Set) @ 60 Minutes Minimum (Traffic) 12 kg-cm Minimum 20 kg-cm or Near Spin minimum ISSA TB-109 Excess Asphalt by LWT Sand Abrasion 50 g/ft2 Maximum (538 g/m2 Maximum) ISSA TB-114 Wet Stripping Pass (90% Minimum) ISSA TB-100 Abrasion Loss One-hour Soak Six-day Soak 50 g/ft2 (538 g/m2) Maximum 75 g/ft2 (807 g/m2) Maximum
ISSA Specifications ISSA TEST NO. DESCRIPTION SPECIFICATION ISSA TB-139 Wet Cohesion @ 30 Minutes Minimum (Set) @ 60 Minutes Minimum (Traffic) 12 kg-cm Minimum 20 kg-cm or Near Spin minimum ISSA TB-109 Excess Asphalt by LWT Sand Abrasion 50 g/ft2 Maximum (538 g/m2 Maximum) ISSA TB-114 Wet Stripping Pass (90% Minimum) ISSA TB-100 Wet-Track Abrasion Loss One-hour Soak 75 g/ft2 (807 g/m2) Maximum ISSA TB-113 Mix Time @ 77 degrees F Controllable to 180 Seconds Minimum ISSA TB-106 Slurry Seal Consistency 0.79-1.18 inches (2.0-3.0 cm) Construction. Aggregate Production. Produce and furnish material within the limits of Table of Gradation- Aggregate for Slurry Seal and is composed of 100 percent crushed material. Aggregate gradation testing will be performed according to MT 320, and the aggregate tested will be recovered by MT 319. Samples will be dried to a constant weight in oven before beginning MT 319. Be responsible for all sampling and testing to control gradation during aggregate production. Establish a process quality control plan addressing the following: Equipment Maintenance;