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High-Strength Stone Interlocked Cemented Aggregate Pavement Construction

Learn about the innovative Hi-Lab construction technique that maximizes aggregate interlock and stone packing in pavement design. This cost-effective method utilizes a low fines matrix and has proven engineering properties. Case studies demonstrate substantial cost savings without sacrificing performance.

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High-Strength Stone Interlocked Cemented Aggregate Pavement Construction

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  1. Pavement design and construction technique using high strength stone interlocked cemented aggregate low fines matrix. Gerhard van Blerk June 2014

  2. Introduction:“More for Less” • Global financial constraints and a steep increase in bitumen prices • RCA’s are seeking alternative construction techniques (Hi-Lab) • Embrace the origin of road construction (John Loudon McAdam, 1820) through modern pavement construction techniques

  3. Macadam Pavement Design: “Back to Basics”

  4. Design Intent:High degree of aggregate interlock Maximize stone packing, forcing “full” stone on stone interlock through a controlled process of: • grading (percentage of large aggregate fraction) • aggregate quality (crushing resistance) • small amount of cement (3%) • construction technique

  5. Material Selection and Properties: Aggregate Grading

  6. Hi-Lab Construction Technique: Aggregate Placing

  7. Hi-Lab Construction Technique: Placing and Grading

  8. Hi-Lab Construction Technique: Cement Spreading

  9. Hi-Lab Construction Technique: Subbase Stabilization (mixing process)

  10. Hi-Lab Construction Technique: Base Stabilization (mixing process)

  11. Material Selection and Properties: Aggregate Grading

  12. Hi-Lab Construction Technique: Compaction and Final Surface

  13. Hi-Lab Construction Technique: Compaction and Final Surface

  14. Hi-Lab Construction Technique: Engineering Properties (Strength) • Indirect Tensile Strength (ITS)

  15. Hi-Lab Construction Technique: Engineering Properties (Strength) • Beam Fatigue Tensile Strain

  16. Hi-Lab Construction Technique: Engineering Properties (Strength)

  17. Hi-Lab Construction Technique: Engineering Properties (Strength)

  18. Hi-Lab Construction Technique: Engineering Properties (Strength)

  19. Hi-Lab Construction Technique: Observed Performance

  20. Case Studies: Cost Saving Substantial cost savings without sacrificing performance. Pavement construction cost savings between 30% to 40%. Base layer construction cost savings between 100% to 400% e.g. SAC ($100/m^2) – Hi-Lab ($25/m^2). 20

  21. Conclusion/Summary: Realizing the proven performance associated with the Macadam design theory through modern stabilization equipment. Observed engineering properties are very promising. Case studies shows this technique to be a viable alternative to more costly options. 21

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