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Overlay Design Workshop for Flexible Pavements

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Title: Overlay Design Workshop for Flexible Pavements


1
Overlay Design Workshop for Flexible Pavements
  • James A. Crovetti
  • Marquette University

2
WHRP Project Background
  • Project 0092-07-12 Implementation of Flexible
    Pavement Overlay Design Procedures
  • Project 0092-00-05 Development of Rational
    Overlay Design Procedures for Flexible Pavements
    (WHRP 05-12)
  • Project 0092-03-14 Development of
    Modulus-to-Temperature Relations for HMA Mixtures
    in Wisconsin (WHRP 05-11)

3
Implementation of Flexible Pavement Overlay
Design Procedures
  • Development of Overlay Design Software
  • Revisions to FDM
  • Knowledge Transfer
  • Follow-Up

4
FDM 14-10-30
  • Structural Number Approach New
  • Design Traffic, Soil Support
  • Structural Deficiency Approach Overlay
  • SNol SNnew SNeff
  • Design Reliability
  • Traffic, Materials

5
Structural Deficiency Approach
  • New pavement designed using WisPAVE (SNnew)
  • Existing pavement analyzed to determine
    structural adequacy (SNeff)
  • FWD data
  • Component analysis
  • Overlay thickness developed to overcome SN
    shortage
  • hOL (SNnew-SNeff)/0.44

6
Traffic Analysis
  • Analyzed 2006 WIM data from 17 sites across the
    State
  • ESALs per truck computed based on AASHTO
    principles
  • Cumulative frequency of EALFs developed to select
    appropriate factors for variable levels of
    design reliability

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85.6 Design Reliability
EALF 0.3 (WisDOT FDM 14-1-5)
10
Traffic-Based Design Reliability
11
90 Design Reliability
67 Design Reliability
EALF 0.9
1.84
12
Reliability-Based EALFs
13
Recommended EALFs
14
Overlay Design Software
  • Eri and/or SNeff variations determined based on
    FWD test results or component analysis
  • FWD provides SNeff and SSV without pavement
    coring
  • New pavement (SNnew) and overlay (SNOL)
    requirements determined based on current WisDOT
    procedures with varying levels of design
    reliability

15
Component Analysis

16
Component Analysis
17
Component Analysis

18
Overlay Design EquationsBased on FWD Data- No
Milling Before Overlay -
  • Eri 22.04 - 3.645 D36 0.158 D362
  • AUPP ½ (5D0 2D12 2D24 D36)
  • E1/3T 10(3.574 - 0.437 Log AUPP - 0.066 Log
    Eri)
  • SNeff 0.0055 (E1/3T) - 0.0012 Eri
  • 0.144

19
Subgrade EffectsEri 22.04 - 3.645 D36 0.158
D362
20
Seasonal Subgrade Stiffness Variations
21
Subgrade Estimations
22
Correction Factors for Subgrade Strength
  • FWD Testing during
  • Critical Spring Period 2.48
  • Late Spring 0.83
  • Summer/Fall 0.50

23
Constructed Pavement Layer Variations
F W D
Strong
Weak
24
Strong Pavement
AUPP
25
Weak Pavement
AUPP
26
Pavement Strength, SNeff
  • Eri 22.04 - 3.645 D36 0.158 D362
  • AUPP ½ (5D0 2D12 2D24 D36)
  • E1/3T 10(3.574 - 0.437 Log AUPP - 0.066 Log
    Eri)
  • SNeff 0.0055 (E1/3T) - 0.0012 Eri
  • 0.144

27
Modulus-to-Temperature Effects for HMA
Log Mr 6.83 0.018 P200 0.044 Vv 0.00086
tp1.45 Pb.5
28
Example Pavement
2 HMA E varies
3 HMA E450ksi
12 CABC Stress Hardening
240 Subgrade Stress Softening
Bedrock
29
FWD Deflection Basins
30
Temperature Corrected Deflections
31
Overlay Design EquationsBased on FWD Data- With
Milling Before Overlay -
  • AUPP2 8D0 6D8 2D12
  • SNHMA 20.058 (AUPP2)-0.590649
  • a1 SNHMA / THMA
  • SNpost-mill SNeff a1Tmill

32
Overlay Design Example
  • 4-Lane State Trunk Highway
  • 20 year overlay design
  • CYADT12,000 DYADT17,000
  • 7 Heavy Trucks
  • Existing pavement contains 10 alligator cracking
    and slight rutting
  • Thickness information from coring not available
    (8 HMA from plans)
  • FWD test data provided from September testing

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Lets Explore
  • Importing FWD Data
  • Adjusting Traffic
  • Computing SN values and Overlay Thicknesses

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