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Prof Fred Hugo PE FSAAE DEng PhD 南非工程院院士 南非 - 中国交通合作中心 SACTCC 顾问 Advisor

M LS - APT’s Role in Pavement Design Model Development MLS and MMLS3 Innovative APT Technology and Applications 移动式路面加速加载系列 MLS 和 MMLS3 创新技术和应用. Prof Fred Hugo PE FSAAE DEng PhD 南非工程院院士 南非 - 中国交通合作中心 SACTCC 顾问 Advisor Beijing 16 May 2008 年 5 月 16 日 北京.

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Prof Fred Hugo PE FSAAE DEng PhD 南非工程院院士 南非 - 中国交通合作中心 SACTCC 顾问 Advisor

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  1. MLS - APT’s Role in Pavement Design Model DevelopmentMLS and MMLS3 Innovative APT Technology and Applications移动式路面加速加载系列MLS 和MMLS3创新技术和应用 Prof Fred Hugo PE FSAAE DEng PhD 南非工程院院士 南非-中国交通合作中心SACTCC顾问Advisor Beijing 16 May 2008年5月16日 北京

  2. APT is controlled applicationof wheel loadingtopavement structuresfor the purpose ofsimulatingeffectsoflong-term in-service loading conditionsin acompressed time period Definition of APT (after Hugo,2004 Synthesis 325) 路面加速加载试验的定义

  3. What do we want to know and why?主要点 • Deflection >>related to stress and strain • Rutting >>related to deformation • Stiffness changes >>related to response and performance • Distress Mechanisms and related models and transfer functions • Deformation >>rutting • Flexural performance >> fatigue and cracking • Shear >> deformation/cracking • Environmental response and performance >> hot / cold / wet / dry

  4. What do we want to know and why?(cont)续 • Loading rate>>related to stress and strain • Range of validity of characteristics >>related to extrapolation and prediction of of response and performance • Effect of Aging >>related to response and performance • Effect of Densification >>related to response and performance • Effect of Material Properties >>related to response and performance • Validation of analytical tools

  5. Innovative Technological Tools for Evaluating MLS APT Response and Performance创新技术和特点 • Varying Size of Facility不同比例 • MMLS3 - 1/3 scale三分之一 • MLS10 - full-scale足尺 • MLS66 - full-scale足尺 • Mobile Testing Facility移动式测 试多种工况

  6. Innovative Technological Tools for Evaluating MLS APT Response and Performance (cont)续 • Multiple Wheel Trains • Lateral Wander • Varying Test Length • Varying Speed and Frequency • Varying Tyre Pressures • Varying Tyre Tread • Varying Load Amplitude

  7. Two MLS66 being delivered in 2008两台超大型MLS66在2008年投入使用

  8. 同济大学和辽宁省交科院

  9. 同济大学和辽宁省交科院

  10. A Brief Review of Case Studies as Introduction to the Topic实际情况回顾 • In Mozambique ANE embarked on an APT program by WB as most cost effective means to: • Evaluate construction techniques • Determine most economical use of available sub-standard materials in a composite pavement structure • Develop a mechanistic-empirical design system best suited for its needs with due regard to materials and environment

  11. Mozambican Pavement Structure Problem Statement世行项目

  12. Research Overview 研究总观

  13. 200μm electron microscope photos of yellow sand vs. red sand(hydrometer results compatible) yellow red

  14. Scaled Subbase and Basein Laboratory试验室

  15. Namibia Field Application LTPP comparable to MMLS3 Performance Prediction Field testing in Namibia Rut after wet field testing

  16. Latest Laboratory Test Bed, ProfilometerandWater Heater

  17. Europe US Africa MMLS3 Labs Applications MMLS MLS studies in global perspective 2008 China MLS10/66 Owners/ Applications

  18. MMLS3 Tyre contact stresses being measured by SIM of CSIR Refer de Beer and Sadzik SATC 2007

  19. Salient Features of MMLS3 Testing that need to be borne in mind小型三分之一比例尺MLS

  20. Analysis of MMLS3 Performance Stress Potential

  21. Comparison of Vertical Compressive Stresses MMLS3 vs Trucks(Epps et al., WesTrack)

  22. Deflection vs. speed under full-scale truck traffic

  23. Comparison between some MMLS3 Results at different trafficking speeds Rutting mm 4mm Axles x1000 1m

  24. MMLS3 Testing in conjunction with theHVSon N4 near Pretoria现场试验 MODIFIED BENKELMAN BEAM

  25. BASE / SUBGRADE

  26. Red Sand

  27. HOT MIX ASPHALT (HMA)

  28. ROLLER PERFORMANCE DURING CONSTRUCTION

  29. MONITORING EFFECTIVE STIFFNESS RELATIVE TO DENSITY OF COMPACTION

  30. Construction of CTB

  31. Test Site during construction!

  32. MONITORING OF TRIAL SECTION STIFFNESS AFTER CONSTRUCTION

  33. Portable Seismic Pavement Analyzer便携式 PSPA DATA ANALYSIS P-SPA

  34. First Correlations of Seismic Stiffness and Cracking

  35. First Correlations of Seismic Stiffness and Cracking

  36. First Correlations of Seismic Stiffness and Cracking

  37. PSPA TIME RECORD SHEAR WAVE VELOCITY: VS = VR ( 1.13 – 0.16v) SHEAR MODULUS : G = ρVS2 YOUNGS MODULUS : E = 2 ( 1 + v ) G

  38. LET 250 FE (Static – Square loading area) 200 Tensile Strain (microstrain) 150 FE (20 km/h) FE (80 km/h) 100 Response Model(after Jooste)

  39. Stiffness vs. HVS Reps (after Jooste)

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