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Using Rheology To Solve An Application Problem 3.3.2009
1. Using Rheology to Solve an Applications Problem for Process Control or Quality Assurance. By: John Casola , Malvern Instruments & Dr. Randy West , National Center for Asphalt Technology At Auburn University (NCAT)
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3. Paint Shear Stress (Pa) or Shear Rate (s-1) Viscosity (Pa . s Hard to apply / Poor Coverage Splatter / Poor Coverage Stipple Orange Peel Running Dripping Rheological Index A B C
4. Epoxy time (s) or Temperature ( o C) Viscosity (Pa . s Modulus G’ G” (Pa) Initial Viscosity Minimum Viscosity Gel-Cure Time/Temp Ultimate Modulus
5. Paper Coating Viscosity (Pa . s Shear Rate (s-1) A B C D Rate at Blade / Nip Film thickness Dry time
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10. Equi-Viscous Method (rotational viscosity or Brookfield test) 0.1 0.2 0.3 0.5 1 10 5 100 110 120 130 140 150 160 170 180 190 200 Temperature, C Viscosity, Pa s Compaction Range Mixing Range
11. Modified have significantly different temperature susceptibility Modified Neat 0.1 0.2 0.3 0.5 1 10 5 100 110 120 130 140 150 160 170 180 190 200 Temperature, C Viscosity, Pa s Compaction Range Mixing Range
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13. Asphalt Binders In the Test Plan Polymer modified grade unmodified grade B -40 C E A -34 I O D -28 M, N G,H,L F -22 J -16 K -10 PG 82 PG 76 PG 70 PG 64 PG 58 PG 52 Temp Range (C)
14. Asphalts Tested Air Blown All these asphalt binders have the same modulus at the TruGrade Un-Modified Modified