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Concrete Test Section

Concrete Test Section. RPF 8 May 2002. Outline. Objectives Design details Material properties Instrumentation Traffic Construction Conclusion. Objectives. To calibrate cncRisk at the lower end of the traffic spectrum To quantify failure of low-volume concrete pavements. Parties.

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Concrete Test Section

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  1. Concrete Test Section RPF 8 May 2002

  2. Outline • Objectives • Design details • Material properties • Instrumentation • Traffic • Construction • Conclusion

  3. Objectives • To calibrate cncRisk at the lower end of the traffic spectrum • To quantify failure of low-volume concrete pavements

  4. Parties • Cement and Concrete Institute • CSIR Transportek • University of Pretoria • Alpha Stone and Readymix • BKS • Raubex

  5. Design details • University of Pretoria • Section 1 • 75 mm SFRC (30 kg/m3) Joint spacing 3 m • 140 mm Foam concrete subbase • In situ • Section 2 • 75 mm SFRC (30 kg/m3) Joint spacing 6 & 4 m • 125 mm CTS • In situ

  6. Design details • University of Pretoria (cont) • Section 3 • 75 mm SFRC (30 kg/m3) No joints • 25 mm ETB • 125 mm CTS • In situ

  7. Design details • CSIR Transportek • Section 4 • 50 mm “CRCP” • 50 mm ETB • 125 mm CTS • In situ • Section 5 • 75 mm “CRCP” • 25 mm ETB • 125 mm CTS • In situ

  8. Design details • CSIR Transportek • Section 6 • 100 mm “CRCP” • 125 mm CTS • In situ

  9. Design details • C&CI • Section 7 • 100 mm butt jointed Joint spacing 2 and 3 m • 125 mm CTS • In situ • Section 8 • 100 mm butt jointed Joint spacing 2 and 3 m • 40 mm continuously graded asphalt • 100 mm CTS • In situ

  10. Design details • C&CI • Section 9 • 140 mm jointed Joint spacing 2, 3 and 4 m • 125 mm gravel • In situ • Section 10 • 140 mm butt jointed Joint spacing 2, 3 and 4 m • 125 gravel • In situ

  11. Design details • C&CI • Section 11 • 140 mm dowel jointed Joint spacing 2, 3 and 4 m Dowels 25 mm @ 300 c/c • 125 mm gravel • In situ

  12. Material Properties • In situ • CBR 80 • Quartzitic gravel A-1-a G5/G6 • Compaction 97% Mod. AASHTO • FWD deflections  1,0 mm

  13. Material Properties • Subbase • As in situ • Compaction 97% Mod. AASHTO • Stabilized with 2% CEM I 42.5 (C3) (Recycler) • UCS  2000 kPa • FWD deflection 0,9 mm and Stab 0,5 mm

  14. Material Properties • ETB • Subbase material • Stabilized with 1,5% anionic stable grade 60%, 1% cement • Asphalt • Continuously graded hot mix with 60/70 pen • 12 mm aggregate size

  15. Material Properties • Concrete • Strength • fc 22 - 42 MPa • ff 3,7 - 5,6 MPa • Mod E 24 - 33 GPa • Shrinkage 0,05 - 0,06 % • Cement CEM I 42,5/GGBS 80/20

  16. Instrumentation • LVDT’s • Centre • Side • Thermocouples • Conventional • Programmable • MDD’s • Weather station

  17. Construction • Readymix concrete • Compaction by poker and beam • Curing compound • Plastic sheeting

  18. Traffic • Trucks leaving quarry • Weighbridge data • No of axles • Approximately 300 E80’s per day • To date 14 000 E 80’s

  19. Observations • Very little distress to date • Vertical movement at joints under traffic but no relative movement • Rocking of slabs on foam concrete • Some corner breaks • Plastic shrinkage cracks not affecting performance

  20. Future • Ongoing observations • Continual recording of instruments to end May • Panel to define failure • Analysis of results • Availability of data

  21. Thank you

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