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RPF NOVEMBER 2005 REPORT BACK ON TREMTI ‘05

RPF NOVEMBER 2005 REPORT BACK ON TREMTI ‘05. 24 – 26 October 2005 Paris, France. Steph Bredenhann. Main Topics. Fundamental aspects Geology and weather Soil treatment Pavement recycling Materials recycling Technology: Equipment & processes Codification: Guides & standards

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RPF NOVEMBER 2005 REPORT BACK ON TREMTI ‘05

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  1. RPF NOVEMBER 2005REPORT BACK ON TREMTI ‘05 24 – 26 October 2005 Paris, France Steph Bredenhann

  2. Main Topics • Fundamental aspects • Geology and weather • Soil treatment • Pavement recycling • Materials recycling • Technology: Equipment & processes • Codification: Guides & standards • Complementary aspects for specific needs • Investors’ point of view

  3. Fundamental Aspects • Constituents and interactions • Micro-macro approach • Properties and evolution of treated materials • Formulation of new products • New applications • Behaviour of treated materials (performance and durability) • Mechanical behaviour • Soil treatment durability issues

  4. Geology and Weather • Geology: Sulphatic, organic and other elements • Heave and Ettringite (Ca,Al) & Thaumasite (Ca,Si) • Ground granulated blast furnace slag (GGBS) • Increased mellowing time with lime treatment • Effect of Mica • Weather conditions • Freeze-thaw (addition of rubber compounds) • Coarse vs fine-grained soils • Temperature • Water • Cracking • Stabilisation increase durability

  5. Soil Treatment • Treatment for embankments & capping layers • Soil treatment road foundations • Cold in-place treatment • Savings and environmental benefits • Techniques to mitigate cracking • Pre-cutting vs Pre-cracking • Pre-cracking performs the best • Recovery of strength after pre-cracking

  6. Pavement Recycling • Cold in-place treatment • Retread process • Inlays • Savings and environmental benefits • Laboratory investigations important • Mitigation of cracking • Workability period (< 2h)!!!

  7. SA EXPERIENCE:Conditioning Time

  8. Materials Recycling • Recycling material from trenches • RAP in cement stabilised material • Marine/dredge sludge • Recycle old embankments • Soil cement • Lime stabilisation • Scalping materials from quarries • Political and regulatory issues

  9. Technology: Equipment/ Processes • Soils preparation • Spreading of binder • Dry processes • Wet processes • In-situ treatment vs plant-mixed • Valorisation of heterogeneous materials

  10. Codification: Guides & Standards • Need for more documentation • Need more research • Mechanical strength • Modulus • Fatigue

  11. Investors’ Point of View • Soil treatment high speed railway Italy • Urban applications in France • Motorways program Spain • Pavement recycling in Marocco • Strategy of regional application in France

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