Development of Emergency Pothole Repair Material    Using Polyurethane for Asphalt Pavement      Presenter : Yeongmin Kim,...
Research BackgroundTraffic Increase            Heavy Rain                Material Change    Traffic                       ...
Causes of Pothole Occurrence                       Occurrence Causes                            Influencing Factors       ...
Pothole Cause #1Cavity in Pavement                        Stage 1         Stage 2                        Stage 3         S...
Video of Pothole Occurrence
Pothole Cause #2      Poor Drainage• Pothole occurs with the excessive water in pavement due to poor drainage
Pothole Cause #3      Fatigue Cracking• Fatigue cracking due to the repetition of overloaded trucks
Pothole Cause #4  Poor Construction of Longitudinal Joint• Insufficient compaction on the longitudinal joint between exist...
Pothole Cause #5       Bonding Deficiency• A loss of bonding between repair material and existing pavement
Test Method for Pothole Evaluation 1                                 Hamburg Wheel-Tracking Test Result                   ...
Test Method for Pothole Evaluation 2                    Analysis Method of MVT Result                                     ...
Test Results for Pothole Evaluation 1                         7                                 1cycle                    ...
Test Results for Pothole Evaluation 2   Air Void     Frozen-Thaw       TD(mm)        SD(mm)   SD/TD(%)                   1...
Summary of Laboratory Test Results• TD, SD, and SD/TD increase when the air voids are higher resulting in  more water abso...
Development of Waterscape Emergency Repair Material        Problems of existing repair materials    1.      Poor workabil...
Component of Waterscape Emergency Repair Material    Polyurethane (PU)    A polymer containing a large quantity of uretha...
Flowchart of Development      Flowchart 1                                                                                 ...
Evaluation of Material Properties        Material Properties                                                              ...
Comparison against the Existing Material (Video)
Application to Field (Video)
News Reports( MBC News on Mar. 26. 2010)
Thank you  www.kict.re.kr
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Cold patching english ver(kim-yeongmin)-2 kict 02 eng 03032013 - copy

  1. 1. Development of Emergency Pothole Repair Material Using Polyurethane for Asphalt Pavement Presenter : Yeongmin Kim, Senior Researcher
  2. 2. Research BackgroundTraffic Increase Heavy Rain Material Change Traffic Pavement Accident Pothole Increase Failure Development of Pothole Resistance Material and Repair Technology Materials Construction Maintenance Long-life Pavement Reduction in Traffic Accident, Maintenance Cost, Premature Failure
  3. 3. Causes of Pothole Occurrence Occurrence Causes Influencing Factors 1. Existence of cavity in pavement 1. Water, temperature(freeze and thaw), bad tack coat 2. Poor drainage (pore water pressure)Literature 2. Water, saturation degree, traffic 3. Aggregate coated by excessive dust Review 3. Dust and clay content 4. Fragile aggregate 4. Aggregate durability 5. Overlay on weaken concrete pavement 5. Water, water pressure 1. Drainage problem 1. Water, saturation degree, water pressure, 2. Cracking air voids Field 2. Water, saturation degree, air voids 3. Poor construction of longitudinal joint Survey 3. Air voids, density 4. Bonding deficiency 5. Bad tack coat 4. Water, density
  4. 4. Pothole Cause #1Cavity in Pavement Stage 1 Stage 2 Stage 3 Stage 4
  5. 5. Video of Pothole Occurrence
  6. 6. Pothole Cause #2 Poor Drainage• Pothole occurs with the excessive water in pavement due to poor drainage
  7. 7. Pothole Cause #3 Fatigue Cracking• Fatigue cracking due to the repetition of overloaded trucks
  8. 8. Pothole Cause #4 Poor Construction of Longitudinal Joint• Insufficient compaction on the longitudinal joint between existing and new lanes
  9. 9. Pothole Cause #5 Bonding Deficiency• A loss of bonding between repair material and existing pavement
  10. 10. Test Method for Pothole Evaluation 1 Hamburg Wheel-Tracking Test Result MVT (Material Verification Tester) 0 Inverse Creep Slope -5Impression, mm권 Post Compaction - 10 Consolidation Inverse Stripping - 15 Slope - 20 Stripping Point - 25 0 5000 10000 15000 20000 Number of Wheel Passes
  11. 11. Test Method for Pothole Evaluation 2 Analysis Method of MVT Result  Test Condition 3 Rutting Stripping • Water Bath Temp : 50℃ Slope Slope2.5 • Hose Pressure : 100psi • Axial Force : 100lb 21.5  Analysis Method Inflection Point • Fixed Cycle(8000 cycles) 1 • Total Deformation(TD) • Stripping Deformation(SD)0.5 • SD/TD ratio 0 0 1000 2000 3000 4000 5000 6000 7000 8000
  12. 12. Test Results for Pothole Evaluation 1 7 1cycle 2cycle 6 3cycle 5Def or m ation( m m ) 4 3 2 7 1cycle 1 2cycle 6 3cycle 0 5 Def or m ation( m m ) 0 2000 4000 6000 8000 왕복 횟수( No ) 4 Air Voids 2% 3 2 7 1 1cycle 2cycle 6 0 3cycle 0 2000 4000 6000 8000 5 왕복 횟수( No ) Def or m ation( m m ) 4 Air Voids 8% 3 2 1 0 0 2000 4000 6000 8000 왕복 횟수( No ) Air Voids 4%
  13. 13. Test Results for Pothole Evaluation 2 Air Void Frozen-Thaw TD(mm) SD(mm) SD/TD(%) 1 cycle 0.273 - - 2% 2 cycle 2.008 0.580 28.9 3 cycle 2.622 0.877 33.4 1 cycle 1.953 0.682 34.9 4% 2 cycle 3.013 1.027 34.1 3 cycle 5.400 1.898 35.1 1 cycle 4.508 2.501 55.4 8% 2 cycle 5.590 3.046 54.5 3 cycle 6.658 3.981 59.8• TD : Total Deformation(Rutting + Stripping)• SD : Stripping Deformation
  14. 14. Summary of Laboratory Test Results• TD, SD, and SD/TD increase when the air voids are higher resulting in more water absorption.• Water in air voids causes large deformation by reducing binder adhesion and bonding between binder and aggregate.• As a number of cycle of frozen-thaw increases, TD value increases but SD and SD/TD values are not changed significantly.• Stripping Deformation value is not affected by a number of cycle of frozen-thaw.• The primary factor of pothole occurrence is the air voids. Higher air voids increases the possibility of pothole occurrence. A number of cycle of frozen-thaw is not main factor for stripping deformation.
  15. 15. Development of Waterscape Emergency Repair Material Problems of existing repair materials 1. Poor workability 2. Poor adhesion with existing pavement 3. Long curing time 4. Bad compaction due to strong elastic restoring force Need to improve the water resistance Need to consider workability and short curing time Polyurethane binder is selected, instead of cutback asphalt binder which is normally used for emergency repair material.
  16. 16. Component of Waterscape Emergency Repair Material Polyurethane (PU) A polymer containing a large quantity of urethane linksUrea Reaction 2 R-N=C=O + H-O-H R-NHCONH-R + CO2 MDI Water Urea Gas1. Waterscape material (excellent water resistance)2. Shorter curing time and adjustable curing time by catalyst (possible in production stage)3. Outstanding adhesion and chemical resistance4. Oil is added to improve the workability
  17. 17. Flowchart of Development Flowchart 1 Flowchart 2 100Determined 90 CASE1 CASE2 Percent passing in weight(%) gradation 80 70 60 50 40 30 20 10 0 0 0.075 0.15 0.33 1.18 2.36 4.75 9.5 s ieve size(mm)
  18. 18. Evaluation of Material Properties Material Properties Tensile Strength 3.500 A B Tensile strength (kgf/cm2) 3.000 C CASE1 CASE2 CAS CAS 2.500 CASE1m(수침 후) CASE2m(수침 후) 인장 강도(㎏/ ㎠) E1 E2 2.000 1.500 1.000 0.500 0.000 1일 1day 2일 2day 4일 4day 8일 8day 16일 16day 32일 32day 양생 시간(day) Curing time(day) Bond Strength 800 700 Bonding strength (kgf) 600 부착 강도(kgf) 500 4001. Securing the stability to water, strong adhesion force, and 300 increased strength 2002. Development of cold-mix repairing asphalt for color asphalt pavement 100 03. Applicability to the area with residual water, and reduction of A B C CASE1 CASE2 보수재 종류 premature failure after repairing Type of repairing material
  19. 19. Comparison against the Existing Material (Video)
  20. 20. Application to Field (Video)
  21. 21. News Reports( MBC News on Mar. 26. 2010)
  22. 22. Thank you www.kict.re.kr

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