Models for Predicting Reflection Cracking of Hot-Mix Asphalt Overlays (2010) / Chapter Skim
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Pages 48-55
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From page 48... ...
The design program is arranged as a single mechanistic crack growth model with different sets of calibration coefficients for overlays in different climatic zones or with a different pavement structure, such as overlays over cracked asphalt surfaces or over jointed concrete pavements. A total of 11 separate types of pavements were identified with a sufficient amount of quality data to develop sets of calibration coefficients.
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From page 49... ...
Calibration of Calculated Overlay Life to the Observed Distress The two-step method used to develop calibration coefficients first involved linear regression analysis and observation of the patterns of the predicted versus the observed values of both ρ and β. If the coefficient of determination (R2)
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From page 50... ...
Figure 45 shows the predicted versus observed values ρ and β for HMA overlays over a cracked asphalt pavement surface in a Wet-Freeze Zone. Figure 46 shows the predicted versus the observed values of ρ and β for HMA overlays over jointed concrete pavements in a Wet-Freeze Zone.
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From page 51... ...
Figure 48. LMH Regression results of and for AC with Reinforcing over PCC pavement and Wet-No Freeze climate zone.
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Figure 53 shows the predicted development of transverse reflection cracking and severity of an HMA overlay reinforced Figure Number Overlaid Pavement Type Climate Zone Distress Severity Levels 49 Asphalt WF L, M H 50 Jointed Reinforced Concrete WF L, M, H 51 Friction Course over Asphalt WF L, M, H 52 Continuously Reinforced Concrete WF L, M 53 Reinforcing Geosynthetic over Jointed Concrete W-NF L 54 Reinforcing Geosynthetic Over Asphalt DF L 55 Asphalt W-NF L, M 56 Friction Course Over Asphalt W-NF L 57 Asphalt DF L, M, H 58 Asphalt D-NF L, M, H 59 Reinforcing Geosynthetic Over Jointed Concrete WF L, M Table 25.
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From page 53... ...
Figure 54 shows the predicted development of transverse reflection cracking and severity of an HMA overlay reinforced with a geosynthetic material and placed on a cracked asphalt pavement surface in a Dry-Freeze Zone (Amarillo, Texas)
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Figure 57 shows the predicted development of transverse reflection cracking and severity of an HMA overlay over a cracked asphalt pavement surface in a Dry-Freeze Zone (Deaf Smith County, Texas)
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From page 55... ...
The Calibration Program, presented in Appendix P, generates five computed pavement reflection cracking lives that are required of each overlay in the original field data set. At this point, the calibration process is completed by using linear regression analysis to produce the calibration coefficients for the overlay.
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