Demonstration and Inter-Comparison of Seasonal Weight Restriction Models – Phase II - TPF-5(290)

(2020) Demonstration and Inter-Comparison of Seasonal Weight Restriction Models – Phase II - TPF-5(290). Transportation, Department of


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The major tasks of Phase II were to implement the models recommended from Phase I at demonstration sites and to calibrate those models, if required. The models included both degree-day threshold and frost-thaw depth prediction models. Output from the models was then compared with validation data provided by the departments of transportation (DOTs) involved in this study. These validation data consisted of subsurface temperature data (which were reduced by the research team to compute frost and thaw depths) and, in some cases, deflection and/or stiffness data from lightweight deflectometer (LWD) and falling weight deflectometer (FWD) tests. With the results of these implementation and validation efforts, recommendations based on accuracy, simplicity of use, and cost were developed to aid road management agencies in selecting which model or protocol is most appropriate for their intended purposes, personnel, and specific conditions.

Item Type: Departmental Report
Keywords: freeze-thaw cycles, seasonal load restrictions, spring load restrictions (SLRs), winter weight premiums (WWPs)
Subjects: Transportation
Transportation > Traffic safety
Transportation > Research
Transportation > Environment
ID Code: 35060
Deposited By: Iowa DOT Research
Deposited On: 06 Jan 2021 13:18
Last Modified: 06 Jan 2021 13:18