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

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Presentation on theme: "June 2014 Pavement design and construction technique using high strength stone interlocked cemented aggregate low fines matrix. Gerhard van Blerk."— Presentation transcript:

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

2 2 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 3 3 Macadam Pavement Design: “Back to Basics”

4 4 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 5 5 Material Selection and Properties: Aggregate Grading

6 6 6 Hi-Lab Construction Technique: Aggregate Placing

7 7 7 Hi-Lab Construction Technique: Placing and Grading

8 8 8 Hi-Lab Construction Technique: Cement Spreading

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

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

11 11 Material Selection and Properties: Aggregate Grading

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

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

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

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

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

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

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

19 19 Hi-Lab Construction Technique: Observed Performance

20 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).

21 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.

22 22


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