South African Pavement Design Method (SAPDM) Revision Status Report. 26 th RPF Meeting 6 November 2013 L Kannemeyer
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1 South African Pavement Design Method (SAPDM) Revision Status Report 26 th RPF Meeting 6 November 2013 L Kannemeyer
2 Slide 2 Aka GODZILLA
3 SAPDM Revision - Historical Overview Process initiated at RPF -May 2005 R&R framework - November 2005 Pavement Performance Information System (LTPP) Material Classification Concept Pavement Number Concept (PN) 50 Projects Completed February Stabilized Projects Added February 2008 Mechanistic-Empirical Analysis System (MEAS) Phase 1 Develop Detailed Project Briefs November 2006 Phase 2 - Inception Phase (22 Projects) July 2007 Peer Review Phase 2 Reports November 2007 Additional SANRAL Requirements December 2007 Appointment of Main Service Providers September 2008 (5 year) CSIR Built Environment Pavement Modelling Corporation SC Van As Traffic Engineering SAPDM Website ( May 2009 Slide 3
4 SAPDM Revision - Progress To Date Slide 4 Reports Nov 2009 = 8 Reports May 2010 = 21 Reports Nov 2010 = 30 Reports May 2011 = 43 Reports Nov 2011 = 56 Reports Nov 2012 = 77 Reports May 2013 = 88 Reports Nov 2013 = 95 Reports Field Trials Environmental = 41 Sites - Completed Experimental Sections R35 Stabilisation = Oct Monitoring Ongoing R104 Instrumented Typical Pavements = Aug TSD Surface Seals In progress, work Started April 2011 Concrete / Block Integration In progress? Economic HDM4 RUC Reprogrammed, Meeting with Leading Transport Economists on models/guideline
5 SAPDM Performance Simulation Flow Design Investigation Inputs Deterioration models (empirical / ME): Cracking Recursive increment step Adjust parameters for: Operational conditions Deterioration Works effects Pavement model: Rutting HDM-4 type (SN or PN) and Mechanistic (MLLE) and Ravelling Potholes Edge-break Roughness Intervention Criteria and works effects Output: Condition and deterioration for recursive increment Concrete / Block Texture/skid resistance Maintenance and rehabilitation interventions. Auto Calibration Historic Performance Life-Cycle Economic Analysis: Maintenance Cost, Road User Costs, Traffic Accommodation Costs, etc Slide 5 Recommended Action
6 Road Economic Analysis Tools in RSA Up to Since 2000 Slide 6
7 Slide 7 Economic Costs To be Considered???
8 SAPDM Detail Feedback Title Presenter SAPDM Mechanistic Seal Design T Milne R104 Construction H Theyse R104 Instrumentation W Steyn Slide 8
9 SANRAL Traffic Speed Deflectometer (TSD)
10 Pavement Deflection Data Structural Strength (Surface Deflection (mm)) Slide 10 Measured using Falling Weight Deflectometer (FWD) Simulates truck wheel traveling at km/h over road pavement surface Surface deflection bowl is analyzed to establish the structural strength and remaining life of a pavement 100 % of the 200 m intervals every 5 years Deflection Bowl every 80 km/h
11 SANRAL TSD 0THER OUTPUTS 3D Laser Point Clouds 3D Surface Images 2D/3D Surface Images Slide 11
12 SAT TSD Results High Repeatability of results that are independent in terms of : Speed 20 km/h to 80 km/h Roughness IRI 0.8 to 6.0 m/km Deflection D0 0.1 to 1.5 mm Macro Texture MPD 0.7 to 3.0 mm Slide 12
13 Axle Group Load (kg) TSD DYNAMIC LOADING 6000 SAT Site 1 - IRI (m/km) Crossfall / Super elevation / Wind Slide Distance (m) Load Left [kg] (20 km/h) Load Right [kg] (20 km/h) Load Left [kg] (80 km/h) Load Right [kg] (80 km/h)
![3000 0 100 200 300 400 500 600 700 800 900 1000 Distance (m) Load Left [kg]](/docs-images/46/21689531/images/page_13.jpg "(20 km/h) Load Right [kg] (20 km/h) Load Left [kg] (80 km/h) Load Right [kg]")
14 Axle Group Load (kg) TSD DYNAMIC LOADING 6000 SAT Site 4 - IRI (m/km) 95 th Percentile Increase by ±20% Slide Distance (m) Load Left [kg] (20 km/h) Load Right [kg] (20 km/h) Load Left [kg] (80 km/h) Load Right [kg] (80 km/h)
![3000 0 100 200 300 400 500 600 700 800 900 1000 Distance (m) Load Left [kg]](/docs-images/46/21689531/images/page_14.jpg "(20 km/h) Load Right [kg] (20 km/h) Load Left [kg] (80 km/h) Load Right [kg]")
15 D100 Slope TSD Slope 5000 SAT Site 4 - IRI (m/km) Slide Distance (m) Slope 0.1[µm/m] (20 km/h) Slope 0.1[µm/m] (80 km/h)
16 Deflection (µm) TSD vs FWD 2500 SAT Site 4 - IRI (m/km) Same Pattern but shift in sensor position when compared to FWD Slide 16 Distance (m) D0 TSD 80km/h D200 TSD 80km/h D300 TSD 80km/h D0 FWD D200 FWD D300 FWD D500 FWD
17 Investigating Differences Although FWD has been around for some time, cannot be used as the true reference for accepting TSD measurements? Maximum Deflection versus Time History Slide 17 R104 Instrumented Sections
18 Slide 18
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