FWD BackCalculation of Existing Pavement Structure
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- Slide 1
- FWD BackCalculation of Existing Pavement Structure
- Slide 2
- Pavement Structure
- Slide 3
- Critical Responses
- Slide 4
- Overlay Thickness Design (Critical Responses) RuttingVertical
strain on top of the subgrade, within the unbound/bound base and AC
layers Fatigue crackingHorizontal strain at the bottom of AC layers
Thermal crackingTensile stress at the surface of the AC layer
- Slide 5
- Structural Responses for AC/AC Overlays Critical structural
responses are: Tensile strain at the bottom of AC overlay Tensile
strain at the bottom of original AC layer Vertical stress at the
top of the subgrade
- Slide 6
- Structural Responses for AC/AC Overlays AC Overlay Existing AC
Pavement r Base Subgrade v r Bond Milling and Tack Coat
- Slide 7
- Structural Responses for AC/AC Overlays Other considerations:
Not all design procedures consider both strains at the bottom of
the overlay and existing layer Both strains should be examined as a
minimum If the existing layer is extensively cracked it may be
modeled as a granular layer, thus consider only strains at the
bottom of overlay
- Slide 8
- EverStress Input
- Slide 9
- EverStress Load & Evaluation Locations
- Slide 10
- EverStress Output
- Slide 11
- Pavement Deflection 012244872 60
- Slide 12
- EVERCALC General File
- Slide 13
- EVERCALC Deflection File Mil = 1/1000 inch
- Slide 14
- EVERCALC Output File
- Slide 15
- EVERCALC Summary File
- Slide 16
- EVERCALC General File
- Slide 17
- EVERCALC Output File