Bituminous Stabilized Materials Guideline

1
Bituminous Stabilized Materials Guideline

• Project Initiated By
• Gautrans
• Sabita

2
The Need for Recycling Alternatives
10
20
30
40
40
50
60
Percentage of Designs in TRH4 Catalogue for gt 3
msa
3
Current Guidelines Main Deficiencies

• Mix Design
• Lack of a suitable curing method
• Lack of a suitable Shear Strength test
• Lack of criteria to assess durability
  flexibility
• Structural Design
• Very Conservative designs
• Need to expand knowledge base and incorporate
  long term field data

4
Project Structure
5
Tasks for Phase 2

• Mix Design
• Adapt triaxial test and classification limits
• Develop durability test and classification limits
• Standardize specimen preparation, curing,
  compaction testing
• Structural Design
• Expand LTPP database
• Develop and calibrate material classification
  method and pavement design method

6
LTPP
Age Years
MESA Accommodated to Date
Section
3
6
9
12
15
18
21
24
N12-19 (1)
30
30
N12-19 (2)
Support
N1-1314
25
N2-16
Crushed stone
25
N1-1
20
CTB
N7-7
19
Natural gravel
N3-4
17
MR27
17
ETB
P23/1
13
8
D2388
N4-5X (20-25)
8
N4-5X (27-30)
8
N4/1
6
Same-Himo (1)
11
11
Same-Himo (2)
Same-Himo (3)
11
10
MR 504 (1)
MR 504 (2)
10
10
MR 504 (3)
P24/1
6
7
HVS
MESA Accommodated
Age Years
Section
3
6
9
12
15
18
21
24
3
6
9
12
15
18
21
24
90 Surfacing 200 ETB 150 Lime stabilized base 150
Lime stabilized base
N3 HVS (1)
0
N3 HVS (2)
0
Support
N3 HVS (3)
0
N3 HVS (5)
0
Crushed stone
N2-16 (322A2)
8
P9/3 (372A3)
0
CTB
P9/3 (373A3)
0
Natural gravel
P9/3 (374A3A)
0
P9/3 (374A3B)
0
LTB
P9/3 (375A3)
0
P9/3 (376A3)
0
D2388 (397A4)
0
D2388 (403A4)
1
D2388 (407A4)
2
D2388 (408A4)
3
P243/1 (409A4)
0
P243/1 (410A4)
0
P243/1 (411A4)
1
P243/1 (412A4)
1
N7 (415A5)
0
N7 (416A5)
0
N12-19 (415A5)
30
8
Structural Design Method
Vision

• Depend on Rational Inputs
• Determined from field tests using a specific
  procedure
• Direct linkage with specifications
• Clarity and Transparency
• Traceable validation
• Implements design fundamentals
• Straightforward Implementation
• Requires no specialist software
• Reliable and Robust

9
Design Outputs Expectations
Design Method Outputs
Cost, Effort Experience Needed
10
Development Approach

• Range of Traffic Accommodated
• Rut situation, RQ situation
• Cracking situation
• Need for rehabilitation

200 mm BSM 1
130 mm C4
gt 200 mm G6
CBR 7-15
11
Cumulative Traffic
Fingerprint Indicator
12
Conclusion

• Structural Design
• Concept finalized March 2007
• Pilot implementation refinement Mar 07 to Jan
  08
• Mix Design Protocols (2007)
• Focus on Shear Durability
• Improved criteria and classification limits
• Longer term testing and implementation of new
  tests(2008)

13
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14
Design Methodology Concept
Traffic Accommodated (mesa)
30
10
3
1