State Study 111 - Polymer Modified Hot Mix Asphalt Field Trial.pdf

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Table 8. Relative ranking of the different modifiers. True PG Grade Manual Rut Measurements APA on cores @ 147 o F APA on pills @ 120 o F Seal-O-Flex 82 - 27 Rouse Rubber Styrelf Styrelf (Crumb Rubber) Styrelf 77 - 29 Styrelf Seal-O-Flex Cryopolymer Rubber (SB Block Copolymer) Novophalt 76 - 23 Seal-O-Flex Rouse Rubber Seal-O-Flex (SBS Block Copolymer) Rouse Rubber 75 - 29 Kraton Novophalt Novophalt (SBS Block Copolymer) Cryopolymer Rubber 75 - 28 Novophalt Kraton Ultrapave (LDPE) Multigrade 72 - 24 Ultrapave Ultrapave Kraton (SB Random Copolymer Latex) Kraton 71 - 25 Multigrade Cryopolymer Rubber Rouse Rubber (Gelled <strong>Asphalt</strong>) Ultrapave 70 - 27 Cryopolymer Rubber Control Multigrade (Crumb Rubber) Control 70 - 24 Control Control 52
CHAPTER 5: CONCLUSIONS AND RECOMMENDATIONS CONCLUSIONS The following conclusions are based on laboratory and performance test results and on activities at the HMA plant. 8. Each polymer or rubber modifier required mixing at a higher temperature than regular HMA. These temperatures ranged from 320 o to 351 o F. 9. The modified HMA mixes were successfully produced in a normal HMA production facility. Most of the modifiers did not require a blending unit. 10. Once the rolling pattern was established for the modified HMA, further rolling caused the rolling pattern to break off and then to peak again. Initial rolling was with a steelwheel vibratory roller and this was followed with a smaller steel-wheel static roller. (No pneumatic roller was used.) 11. Comparison of laboratory acceptance tests conducted during the construction and cores taken from the pavement the next morning showed that the laboratory air voids were closer to the design air voids than the field results. 12. Brookfield Viscometer tests showed that the modifiers were all more viscous at the lower temperatures. 13. Results of the GTM tests showed that the laboratory specimens had sufficient shear strength to resist the stress state in the pavement and that the air voids were above the flushing level and were consistent with design values. 14. Initial performance test results for the pavement test sections were low roughness and deflection readings and high skid values. These results indicate that the test sections were in an excellent initial condition. 15. Results to date indicate all the modifiers are out-performing the control section, both in terms of roadway rutting and rutting in the APA. It is important to note that the rutting on the control section is still relatively small at about 0.25 inch. 16. The selection of a modified asphalt binder grade based on the high temperature component of the PG designation could be quite inappropriate for a given project, especially when rubber modifiers are considered for use in the HMA. RECOMMENDATIONS 1. It is obvious that all the modified binders are providing superior rutting resistance as compared to the control binder. This validates the wisdom of using modified binders for 53
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FINAL REPORT STATE STUDY NO. 111 PO
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NOTICE The contents of this report
Page 5 and 6:
TABLE OF CONTENTS Section Page CHAP
Page 7 and 8: 22. FWD deflections for Styrelf 37
Page 9 and 10: SCOPE The experimental design calle
Page 11 and 12: This policy was not in effect when
Page 13 and 14: TRAFFIC VOLUMES Traffic for this se
Page 15 and 16: CHAPTER 3: DESIGN AND CONSTRUCTION
Page 17: was then repeated for the surface c
Page 25 and 26: Table 1. Material Types for Polymer
Page 27 and 28: Table 4. Actual stationing for test
Page 29 and 30: Modifier Course Station-to-Station
Page 31 and 32: CHAPTER 4: TESTING PROCEDURES AND R
Page 33 and 34: CONTROL Section Both the binder and
Page 35 and 36: as would be expected for new paveme
Page 37 and 38: BINDER AIR VOIDS AIR VOIDS, % 9 8 7
Page 39 and 40: VISCOSITY CHART FOR BINDER COURSES
Page 42 and 43: AVERAGE SHEAR STRENGTH COMPUTED FRO
Page 44 and 45: FWD DATA FOR KRATON (Sensor locatio
Page 46 and 47: FWD DATA FOR NOVOPHALT (Sensor loca
Page 48 and 49: FWD DATA FOR ULTRAPAVE (Sensor loca
Page 50 and 51: FWD DATA FOR CRYOPOLYMER RUBBER (Se
Page 52 and 53: FWD DATA FOR CONTROL SECTION (Senso
Page 54 and 55: AVERAGE RUT DEPTH (INCHES) 0.40 0.3
Page 56 and 57: APA AVERAGE RUT DEPTHS OF CORES AT
Page 62 and 63: areas of high equivalent single axl
Page 64: APPENDIX A ROLLING PATTERNS 56
Page 67 and 68: POLYMER MODIFIED HMA FIELD TRIAL RO
Page 86 and 87: ASPHALT INSPECTORS DAILY REPORT Lot
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ASPHALT INSPECTORS DAILY REPORT Lot
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Lot No. 180 Date 08/07/1996 Project
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APPENDIX C MANUAL RUT MEASUREMENTS
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State Study 111 - Polymer Modified Hot Mix Asphalt Field Trial.pdf

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