Pavement Rehabilitation Design Case Study. Rehabilitation Investigation and Design of a Major Arterial
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1 Pavement Rehabilitation Design Case Study Rehabilitation Investigation and Design of a Major Arterial
2 Project Details Major Freight Route 4 Lane Dual carriageway Current Traffic Volume 25,000 v/p/d Heavy Vehicles 11.5% (HVAGs/ HV = 2.77) Commercial Vehicle Growth Rate = 8.6% 40year design life requested
3 Investigation Methodology 1. Visual assessment of condition 2. Review construction history & performance 3. Deflection testing 4. Pavement coring and sampling 5. Pavement backanalysis 6. Determine design alternatives
4 Transport and Main Roads Step 1 - Visual Assessment
5 Step1(cont) Visual Assessment Predominant distress in left hand lane Fatigue Cracking Numerous closely spaced transverse cracks Potholing
6 Step 2 - Review of Construction History Original construction 1990 o Sprayed Seal Surfacing o 150mm Granular Type 1.2 layer o 230mm CTSB Pavement overlaid with 50mm AC in mid 98
7 Step 2 (cont) - Review of Past Pavement Performance 50mm AC Overlay design life = 3.5x10^6 ESA s or 4 years (pavement failure by mid 2002) Design life of CTSB layer = 8.5x10^5 ESA s or 4-5 years after construction (CTSB fatigue cracking in 1995) some post cracking life after CTSB fatigue
8 Step 3 Deflection Testing Heavy Weight Deflectometer (HWD) used at 60, 80 and 120kn HWD used due to the presence of cemented layers Deflection testing undertaken in the OWP at 25m intervals
9 Step 3(cont) -120Kn Deflection and Curvature Results
10 Step 4 Field Investigations FWD data plus visual survey used to determine areas for coring and sampling 10 full depth cores undertaken through pavement layers (layer depths recorded) Dynamic Cone Penetrometers (DCP) testing undertaken through the core hole (for determination of subgrade CBR) Samples of the granular base layer were taken by cutting 300mm x 300mm squares from pavement
11 Transport and Main Roads Step 4 (cont) Field Investigations
12 Step 4 (cont) Field Investigations Field Investigations indicated o Granular layer was well compacted and sound (appeared almost lightly bound) o CTSB layer appeared to be failing (layers broke up when coring) o Thickness of asphalt surfacing was generally in the 60-70mm range (not 50mm as per design) o DCP results indicated subgrade CBR s in the range of 4- >60
13 Step 5 Pavement Backanalysis Pavement back analysis undertaken using EfromD2 Model adopted for backanalysis was based on results of field investigations Backanalysis undertaken using 60, 80 and 120kn data so the results of the analysis could be compared
14 tep 5 (contd) - Backanalysis Results Granular 60kn FWD 90 Percentile 350Mpa
15 tep 5 (contd) - Backanalysis Results Granular 120kn FWD 90 Percentile 460Mpa
16 Step 5 (contd) - Backanalysis Results 120kn FWD - CTSB layer Low CTSB Values CTSB Failing?
17 Transport and Main Roads Failed CTSB
18 Step 5 (contd) - Backanalysis Results Subgrade
19 Step 5 (cont d) Findings From Backanalysis Backanalysis agreed with field observations o CTSB was weak/failing in some areas o Granular layer sound o Backcalculated subgrade CBR s similar to DCP results o Extend of full depth asphalt section able to be identified
20 Step 6 - Design Alternatives Pavement design to be designed to meet the requirements of QDMR heavy duty asphalt pavement design manual. Options Reconstruction? Asphalt Overlay? Stabilise Existing and Asphalt Overlay?
21 Step 6 - Design Moduli
22 Step 6 - Design Alternatives Reconstruction
23 Step 6 - Design Alternatives Asphalt Overlay
24 Transport and Main Roads Step 6 - Design Alternatives Asphalt Overlay
25 Step 6 - Design Alternatives Asphalt Overlay Pros o Relatively easy to do (overlay at night) Cons o Expensive ( calculated 310mm AC required) o Failed CTSB layer may cause future problems (problem buried - not treated) o Large increase in grade line required ( issues with bridges, guardrail heights,edge drop off)
26 Step 6 -Design Alternatives Insitu Stabilisation & Asphalt Overlay
27 Transport and Main Roads Step 6 -Design Alternatives Insitu Stabilisation & Asphalt Overlay
28 Step 6 -Design Alternatives Insitu Stabilisation & Asphalt Overlay
29 Step 6 (cont) -Design Alternatives Insitu Stabilisation & Asphalt Overlay Pros o Cheaper than reconstruction or asphalt overlay o Failed CTSB layer is restabilised o Existing pavement reused o Some confidence in previous performance Cons o Gradeline raised by approximately 180mm (not as bad as AC overlay option however) o Lane closures during day required o Reflective cracking still be an issue?
30 Adopted Solution Insitu stabilisation option chosen:- o Cost o Time o Re-use of existing pavement materials
31 Questions???????
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