#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 Wet Cohesion ISSA TB-139 @ 30 Minutes Minimum (Set) 12 kg-cm Minimum @ 60 Minutes Minimum (Traffic) 20 kg-cm or Near Spin minimum 50 g/ft2 Maximum ISSA TB-109 Excess Asphalt by LWT Sand Abrasion (538 g/m2 Maximum) ISSA TB-114 Wet Stripping Pass (90% Minimum) Abrasion Loss 50 g/ft2 (538 g/m2) Maximum ISSA TB-100 One-hour Soak 75 g/ft2 (807 g/m2) Maximum Six-day Soak
#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
special_provisions.docx