1. High Modulus Asphalt (HiMA) Technology Transfer (T 2 ) November 2010 Progress report Prepared for presentation at the 20 th meeting of the Roads Pavements Forum (RPF), CSIR ICC, 10 November 2010 Erik Denneman

2. Slide 2 © CSIR 2006 www.csir.co.za Presentation structure Background on HiMA, The sabita HiMA T 2 project, Progress since RPF May Design guide, Way forward.

3. Slide 3 © CSIR 2006 www.csir.co.za High Modulus Asphalt (HiMA) Origin: France early 90s “Enrobés à Module Elevé” (EME) Typical characteristics: High binder content ≈ 6% by mass of aggregate, Hard binder: Pen 10-25, Low air voids content, High Modulus > 14 GPa at 15°C, 10 Hz, High resistance against permanent deformation, Good fatigue resistance, Impermeable, High mixing temperature.

4. Slide 4 © CSIR 2006 www.csir.co.za sabita HiMA T 2 project Phase IV Drafting of guidelines and specs Phase III Validation through APT,LTPP and lab study Phase II Preliminary mix and structural design guidelines Phase I Feasibility study

5. Slide 5 © CSIR 2006 www.csir.co.za HiMA T 2 progress (since previous RPF) Preliminary design guidelines complete, Validation mix design for APT pending, Waiting for suitable binder

6. Slide 6 Comparison of mix moduli © CSIR 2006 www.csir.co.za

7. Slide 7 © CSIR 2006 www.csir.co.za Permanent deformation (RSST-CH)

8. Slide 8 © CSIR 2006 www.csir.co.za Fatigue results (10 °C 25 Hz)

9. Slide 9 © CSIR 2006 www.csir.co.za French mix design effort ParameterRequirementResultSA equivalent test Workability (Gyratory compactor) Max 6% voids after 100 gyrations 5.7 %Gyratory Durability (Duriez test) Retained strength: >0.7 0.9Modified Lottmann Rutting (Wheel tracker) Rut depth after 30 000 cycles <7.5 mm 5.2 mmRSST-CH, Wheel tracking Beam dynamic modulus 15 °C-10 Hz: >14 GPa 17 GPaBeam or cylinder dynamic modulus Fatigue (Prism) με for 10 6 fatigue life: >130 90 μεBeam fatigue

10. Slide 10 © CSIR 2006 www.csir.co.za Gyratory study

11. Slide 11 © CSIR 2006 www.csir.co.za French SUPERPAVE

12. Slide 12 © CSIR 2006 www.csir.co.za Interim guideline Warning! Do not try this at home. Validation through APT pending

13. Slide 13 © CSIR 2006 www.csir.co.za Guideline Select components Formulate design grading Select binder content Compact gyratory specimens Workability criteria met? Durability criteria met? Rut resistance criteria met? Dynamic modulus criteria met? Compact slab Fatigue criteria met? Implement! Yes No Yes No Yes No

14. Slide 14 © CSIR 2006 www.csir.co.za Aggregate selection PropertyTestMethodCriteria HardnessFines aggregate crushing test: 10 %FACTTMH1, B1≥ 160 kN Aggregate crushing value ACVTMH1, B1≤ 25% Particle shape & textureFlakiness Index testSANS 3001≤ 25 Particle index testASTM D3398>15 Polished stone valueSANS 3848>50 a Water absorption Water absorption coarse aggregate (>4.75mm) TMH1, B14≤ 1.0 % Water absorption fine aggregateTMH1, B14≤ 1.5 % CleanlinessSand equivalency testTMH1, B19≥ 50

15. Slide 15 © CSIR 2006 www.csir.co.za Grading D=14

16. Slide 16 © CSIR 2006 www.csir.co.za

17. Slide 17 © CSIR 2006 www.csir.co.za Way forward: Validate improved mix design, Perform APT and LTPP, Finalize mix design and structural design guidelines

18. Thank you