MoDOT pavement preservation research program volume III, development of pavement family and treatment performance models.
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2015-10-01
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Abstract:Pavement performance models describe the deterioration behavior of pavements. They are essential in a pavement management
system if the goal is to make more objective, reliable, and cost-effective decisions regarding the timing and nature of pavement
maintenance activities. The general objective of Task 2 was to develop performance models for a variety of pavement families and
pavement preservation treatments used by the Missouri Department of Transportation (MoDOT). Using the data collected in Task
1, linear least-squares regression techniques were used to generate deterministic models that predict the International Roughness
Index (IRI), the pavement condition measure most widely used today. Family IRI-prediction models were developed for full-depth
asphalt (FDA), concrete (PCC), and composite (Comp) pavements. Treatment IRI-prediction models were developed for 1-in.
overlays on FDA pavements, chip seals on FDA pavements, and 3.75-in. overlays on PCC pavement. Predictor variables
consistently shown to be highly significant in predicting IRI for both FDA and Comp pavements were initial IRI (IRIo or the IRI
value right after treatment) and pavement surface age (SA). The majority of the PCC pavement sections selected were so old that
IRIo could not be determined (or estimated with any confidence), therefore SA was the dominant predictor variable in the PCC
pavement family model. Terminal IRI (IRIt
which was the IRI just prior to a treatment) was also a significant predictor of IRI and
was directly or indirectly included in the FDA and Comp family and treatment models. Additional significant IRI predictors
(depending on the model) were the climate parameters DT32 (days/year that air temperature was below freezing), FT (freeze/thaw
cycles per year), and DP01 (days/year that precipitation was at least 0.1–in.), subgrade soil parameters P200 (percent passing the
#200 sieve) and Pclay (percent clay-size soil), and LstTrtThk (the last treatment thickness).
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