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Kict presentation20140314final eng ROAD EXPO 2014 Mongolia
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Kict presentation20140314final eng ROAD EXPO 2014 Mongolia

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  • 1. Development and Application of Polymer- Modified Warm-Mix Asphalt Technology Customized for Mongolia Road Condition 2nd International Mongolia Road Expo & Conference March 21-22, 2014., Buyant-Ukhaa Sport‟s Palace
  • 2. 2 Content Polymer-Modified Warm-Mix Asphalt (PWMA) Pavement Conditions in Mongolia Field Applications of PWAM Customized for Mongolian Road Condition Development of PWAM Customized for Mongolian Road Condition Conclusions
  • 3. 3 KICT Activity in Mongolia KICT is collaborating with MRT, MRA, UB, ESTO to contribute to improve Mongolian road condition MOU Technical Support Training
  • 4. 4 1st International Mongolia Road Expo & Conference
  • 5. 5 Key Factors of Building Good Asphalt Pavement If anyone wants to build good pavement, you should consider the following four key factors. Material Selection Mix Design Production Construction High quality and consistent materials should be selected based on the standard specification. Bitumen & Aggregate Paving and compacting process should be proceed with proper temperature. Mixing and producing temperatures should be controlled accurately at asphalt plant. Design Aggregate Structure Design Binder Content Laboratory mix design and performance tests should be conducted at well equipped laboratory.
  • 6. 6 Causes of Early Failures in Mongolian Road 1. Traffic Loading 2. Environment Loading 3. Inappropriate Materials 4. No Quality Control of Pavement Construction
  • 7. 7 Ulaanbaatar City Road 7 Stripping Construction Joint Thermal Crack Surface Layer Base Layer Crushed Aggregate Intermediate Layer Base Layer Crushed Aggregate Surface Layer 18cm 4cm 3cm 5cm 6cm 15cm 30cm Mongolia Korea Too thin asphalt layer leads to create crack faster and other distress Bad Smoothness
  • 8. 8 South Gobi Road Heavy Traffic No QA/QC Cold Weather Early Failure after 1 year Service Life
  • 9. 9 Polymer-Modified Asphalt 9 Polymer-modified asphalt coats aggregates to enhance adhesion Aggregate Aggregate Asphalt Polymer + + Aggregate Polymer-Modified Asphalt Mixture = Polymer-Modified Asphalt Polymer Asphalt Polymer-modifiedasphalt is a compositionof bitumen and polymer
  • 10. 10 Polymer-Modified Asphalt Covers Wide Range of Temperature 0 10 20 30 40 50 60-10-20-30-40 70 80 PG 58-28 PG 70-34 Unmodified Bitumen Polymer-Modified Asphalt This is the benefit of the Polymer Temperature ºC -50
  • 11. 11 Roles of Polymer-Modified Asphalt Pavement Plastic Deformation (Rutting) Low Temperature Cracking Heavy Traffic Condition Cold Weather Condition PMA Pavement leads to 1) Improve rutting resistance 2) Reduce fatigue cracking 3) Mitigate thermal cracking 4) Resist top-down cracking
  • 12. 12 Considerations of Using Polymer-Modified Asphalt Mixture Warm-mix asphalt technology can reduce producing and compacting temperature of polymer-modified asphalt mixture to maintain its workability and compactability Polymer-Modified Asphalt Polymer-Modified Asphalt (PMA) mixture should be produced at 170˚C to 190˚C and compacted at 140˚C to 160˚C because of maintaining mixture’s workability and compactability. ※ If appropriate temperatures are not achieved, well coating aggregate and required field density are not guaranteed Polymer-Modified Asphalt Unmodified Asphalt
  • 13. 13 Warm-Mix Asphalt Technology 180°C 160°C 140°C 120°C 100°C 80°C Production Temperature Construction Temperature Production Temperature Construction Temperature 180°C 160°C 140°C 120°C 100°C 80°C Hot-Mix Asphalt Pavement Warm-Mix Asphalt Pavement
  • 14. 14 Benefits of Warm-Mix Asphalt By decreased production, and compaction temperatures, we have many benefits WARM WARM HOT HOT Production Process 1. Saving Energy 2. Reducing Emissions Paving Process 1. Better workability and compactability 2. Extending Constriction Period 3. Early Traffic Open
  • 15. 15 Reduction of Traffic Open Time Temperature vs. Time WMA Pavement 5 hrs 20 min HMA Pavement 7 hrs 30 min Temperature(C) Time (min) Temperature Monitoring
  • 16. 16 Extension of Compaction Temperature of Warm-Mix Asphalt Pavements 200°C 180°C 160°C 140°C 120°C 100°C 80°C 60°C 40°C 20°C 1st 2nd 3rdHot-Mix Asphalt Warm-Mix Asphalt 1st Compaction 2nd Compaction 3rd Compaction Not compactable 1st 2nd 3rd Not compactable WMA provides longer compaction time WMA provides longer construction period Better workability and comapctability
  • 17. 17 Extension of Paving Construction Period in Cold Region 1 2 3 4 5 6 7 8 9 10 11 Hot-Mix Asphalt Pavement Warm-Mix Asphalt Pavement Current Period of Road Construction in Mongolia (6 months) Changed Period of Road Construction in Mongolia (7.5 months) WMA technology would extend construction period, about 2 months in Mongolia, WMA mixtures are still workable and compactable at low temperatures. Extended period of road construction will encourage to build more roads in Mongolia 12
  • 18. 18 LEADCAP WMA Technology LEADCAP Family LEADCAP-B (Base) LEADCAP-M (Modified) LEADCAP-A (Advanced)  In 2009, the Korea Institute of Construction Technology (KICT) and Kumho Petrochemical, Ltd. developed a new warm-mix asphalt technology.  Named “Low Energy and Low Carbon-Dioxide Asphalt Pavement (LEADCAP)”  LEADCAP is an additive of a wax-based composition including a crystal controller and an adhesion promoter.  Easy to reduce viscosity of bitumen to be compacted at warm temperature
  • 19. 19 Why We Should Use Polymer-Modified Warm-Mix Asphalt (PWMA) Pavement in Mongolia Heavy TrafficLow temperature Thermal Crack Construction Defect Rutting Overall Damage Traffic LoadingEnvironment Loading Quality Control & Quality Assurance Polymer Modified Asphalt (PMA) Warm-Mix Asphalt SBS (Styrene-Butadiene-Styrene Block Copolymer) Rubber : Elastic recovery properties Wax based composition Low viscosity Improve rutting resistanceMitigate thermal cracking Manage temperatures
  • 20. 20 Development of Polymer-Modified Warm-Mix Asphalt (PWMA) Customized for Mongolian Weather and Traffic Conditions  Improving engineering properties, particularly, crack resistance at low temperature and rutting resistance at high temperature  Improving workability  Providing better compaction on the road and the ability to haul paving mix for longer distance  Extending the paving season by being able to pave at lower temperature PMA WMA Polymer + LEADCAP LEADCAP WMA additive N2 Polymer N4 Polymer
  • 21. 21 Ductility and Viscosity Results Ductility Viscosity 2.8 1.9 1.7 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Stright Asphalt WMA PMA-N2 WMA PMA-N4 Rotationalviscosity @135ºC(Pa.s) Type of Asphalt Binder  The rotational viscosity of WMA PMA-N2 and WMA PMA-N4 decreases about 0.9Pa.s to 1.1Pa.s compared to straight asphalt.  It is good indicator of effectiveness of WMA additive to reduce the viscosity of polymer- modified asphalt at 135 ºC 7.9 25.2 29.8 0 5 10 15 20 25 30 35 Stright Asphalt WMA PMA-N2 WMA PMA-N4 Ductility(cm) Type of Asphalt Binder  The ductility of WMA PMA-N2 and WMA PMA-N4 increases about 17.3cm to 21.9 ºC compared to straight asphalt.  It indicates that WMA PMA would be more flexible than straight asphalt at room temperature.
  • 22. 22 PG & Flexibility at Low Temperature Performance Grade PG 58-28 PG 70-34 Unmodified Bitumen WARM PMA Bitumen 58 28 34 70 LowTemp.HighTemp. Flexibility Force(MPa) Deformation (mm) Cold Bending Test ① ② ① Unmodified Bitumen ② PWMA Bitumen
  • 23. 23 Polymer-Modified WMA Pavement Successfully Debut in Mongolia in 2012
  • 24. 24 Field Application of PWMA Pavement in Mongolia 2012 2013 UKHAA KHUDAG – GASHUUN SUKHAIT South Gobi Road Ulaanbaatar City Road Ulaanbaatar City Road Project Site Project Site Project Site
  • 25. 25 Mix Design Results and Cross Section UlaanbaatarSouth Gobi OAC(%) Air Void(%) HMA (Unmodified asphalt) 5.2 4.3 WMA (LEADCAP) 5.2 4.0 PWMA 5.4 3.8 OAC(%) Air Void(%) HMA (Unmodified asphalt) 5.2 4.3 PWMA-1 5.2 4.0 PWMA-2 5.4 3.8
  • 26. 26 Field Trials of PWMA Pavement in South Gobi Road in 2012 HMA PWMA-1 PWMA-2 Gmm (g/㎤) 2.505 2.492 2.499 Core Density (g/㎤) 2.267 2.295 2.305 Air Voids (%) 9.5 7.9 7.8 Condition Information Weather Condition 2012.09 (Fall) Mix Type 19mm Dense-Graded Asphalt Additive Type-1 PWMA -1 Additive Type-2 PWMA-2 Mixing Type with LEADCAP Plant-mixed Mixing Temp. 150±5˚C (PWMA-1) 155±5˚C (PWMA-2) Compaction Temp. 140±5˚C (PWMA-1) 145±5˚C (PWMA-2)
  • 27. 27 Field Trials of PWMA Pavement in Ulaanbaatar City Road in 2012 Condition Information Weather Condition 2012.09 (Fall) Mix Type 13mm Dense-Graded Asphalt Additive Type-1 WMA(LEADCAP) Additive Type-2 PWMA(PMA+LEADCAP) Mixing Type Plant-mixed Mixing Temperature 140±5˚C (WMA) 150±5˚C (PWMA) Compaction Temperature 130±5˚C (WMA) 140±5˚C (PWMA) HMA WMA WMA PMA Gmm (g/㎤) 2.388 2.443 2.437 Core Density (g/㎤) 2.344 2.341 2.382 Air Voids (%) 1.8 4.1 2.5
  • 28. 28 Field Trials of PWMA Pavement in Ulaanbaatar City Road in 2013 Condition Information Weather Condition 2013.09 (Fall) Mix Type 13mm Dense-Graded Asphalt Additive Type-2 PWMA(STE-M3) Mixing Type Plant-mixed Mixing Temperature 150±5˚C (PWMA) Compaction Temperature 140±5˚C (PWMA)
  • 29. 29 Quality Control with KICT Researchers
  • 30. 30 Training and Technical Know-How Transfer
  • 31. 31 Everyone is Smiling because We Successfully Built New PWMA Pavement in Mongolia
  • 32. 32 Conclusions 1. Early distresses, such as cracks and rutting, have occurred from Mongolian pavements due to heavy traffic, severe weather condition and inappropriate quality control of paving construction. 2. Polymer-modified warm-mix asphalt(PWMA) is selected to enhance rutting and crack resistances at high and low temperatures. 3. Polymer-modified warm-mix asphalt(PWMA) is selected to reduce the mixing and compacting temperatures and to provide better compaction on the road and ability to haul paving mix for longer distances. 4. The PWMA field trials were successfully completed in South Gobi road and Ulaanbaatar road. 5. Field experiences confirmed that PWMA is effective to produce and compact asphalt mixture at temperature of 20°C lower than conventional PMA mixture. 6. Long-term performance and durability of PWMA pavements should be monitored and researched further.
  • 33. 33 „NOTHING‟ is not an Option Polymer-Modified Warm- Mix Asphalt (PWMA) Pavement will leads to improve road condition in Mongolia Samsung Smart Phone Hyundai Automobile
  • 34. Thank You 2nd International Mongolia Road Expo & Conference March 21-22, 2014., Buyant-Ukhaa Sport‟s Palace БАЯРЛАЛАА