Warm Mix Technology SEAUPG Nashville,Tn. Larry L Michael Asphalt Consultant Warm Mix Technology Reduce Mixing and Compaction Temperature Reduce Fumes Reduce Fuel Costs Improve Workability Improve Density Extend Paving Window Improve Quality CONCERNS: Costs Process Binder Storage Tanks PG Binder Grade Long Term Performance DOT Acceptance There s No Smoke Available WMA Technologies Processes include: WAM Foam Shell/Kolo Veidekke Zeolite Eurovia/Hubbard Construction Sasobit Sasol Int./Moore and Munger Evotherm - MeadWestvaco New processes Sasobit Fischer-Tropsch waxes Different than naturally occurring asphalt waxes in structure and physical properties Higher melting point Lower penetration Higher viscosity Higher molecular weight Sasobit Frankfurt International Airport Renovation of Runway North, Sectors & 2 Frankfurt Airport Old concrete runway had to be removed and replaced under traffic Work only possible in night shifts between 0:30 pm and 6:00 am 7 ½ hours from demolition of concrete to plane landing on new asphalt Any delay in construction would mean major upset in European air
Frankfurt Airport Asphalt mixture laid at low temperature Better compactability Increased resistance to deformation at high temperatures Frankfurt Airport Bear heaviest aircraft in 2-3 hours Reduced cooling, key to 300-step project QUESTION First runway in 200 Second runway in 2003 Contract was in both cases a renovation of binder course and wearing course The wearing course was to have lowest possible permeability Contract called for an SMA 0/Hamburg with % less voids than usual Hamburg lies in a very wet climate, frequent freeze/thaw cycles and heavy use of deicing fluids are demanding a premium asphalt construction Will Sasobit have a negative effect on mix quality? NCAT Evaluation Improved compact ability to 90 0 F Did not affect resilient modulus Did not increase rutting potential (APA) Cure time to open to traffic is not an issue Moisture damage with lower temperature may be an issue Anti-aging Properties Field Trials. 45% RAP 9mm Base 2. SMA 9.0mm Intermediate Base 3. 35% RAP 9.5mm Surface Mix Added.5% Sasobit by weight of total binder 2
45% Rap Hi Tech Solutions 3
50 C) 320 F Performance Evaluation of High RAP Base Mixture Containing Sasobit Maryland State Highway Administration Advanced Asphalt Technologies, LLC 08 Powers Court, Suite 00 Sterling, VA 2066-932 (703) 444-4200 August 9, 2005 DVANCED ASPHALT TECHNOLOGIES NGINEERING SERVICES FOR THE ASPHALT INDUSTRY Mixture Dynamic Modulus Master Curves for Plant Aged Conditions Mixture Dynamic modulus Master Curves for Long-Term Oven Aged Conditions 0000 Plant Aged Control 0000 LTOA Control 000 Plant Aged SASOBIT 000 LTOA SASOBIT E*, ksi 00 0 Log Shift Factor 3 2 0 - -2 E*, ksi 00 0 Log Shift Factor 3 2 0 - -2-3 0 0 20 30 40 50 Temperature, C.E-06.E-05.E-04.E-03.E-02.E-0.E+00.E+0.E+02.E+03.E+04.E+05.E+06 Reduced Frequency, Hz -3 0 0 20 30 40 50 Temperature, C.E-06.E-05.E-04.E-03.E-02.E-0.E+00.E+0.E+02.E+03.E+04.E+05.E+06 Reduced Frequency, Hz 4
Effect of Simulated Long-Term Aging Repeated Load Permanent Deformation Response for Control and Sasobit Mixtures 0.50 2.0 0.45.8 Control Sasobit 0.40 0.35 Control Control 2 Plant Aged E* / LTOA E*.6.4.2 Permanent Axial Strain, % 0.30 0.25 0.20 0.5 Control 3 SASOBIT SASOBIT 2 SASOBIT 3 0.0.0 0.05 0.8.E-06.E-05.E-04.E-03.E-02.E-0.E+00.E+0 Reduced Frequency, Hz 0.00 0 000 2000 3000 4000 5000 6000 7000 8000 9000 0000 Number of Loads Estimated Thermal Stresses and Critical Cracking Temperatures Comparison of Master Creep Compliance Curves Stress, psi 000 900 Control 800 SASOBIT 700 600 500 400 300 200 00 0-40 -20 0 20 40 Temperature, F D(t), /psi.e-04.e-05.e-06 Control SASOBIT.E-07.E+00.E+02.E+04.E+06.E+08.E+0 Loading Time, s 9.0mm SMA 5
Hi Tech Solutions 6
Gap-Graded SMA Sasobit: Mix temp 252ºF. Using tighter temp scale. Mat looks good. Intelligent Compaction Improve Compaction Efficiency Improve Compaction Quality Real Time Information Identify Questionable Areas Improve Quality 7
ICC Draft Report Stiffness of Conventional Mix and Sasobit were statistically the same with Sasobit being placed 50 F cooler. 35 % RAP 8
2 350 F without Sasobit 275 F SUMMARY With Sasobit you can: Reduce Mixing and Compaction Temperature Reduce Fumes Reduce Fuel Costs Improve Workability Improve Density Extend Paving Window Improve Quality 9