01763697

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https://annualmeeting.myt...nlineProgram/Details/15782

Temperature profiles are a fundamental input into mechanistic-empirical pavement analysis and design, and the enhanced integrated climactic model (EICM) is the state-of-the-practice for calculating those profiles. The EICM has also been used in mechanistic-empirical analysis to evaluate the effects of climate change on pavements and to estimate the effects of pavements on urban heat islands. The calculations in the EICM for pavement temperatures can be split into two areas: the thermal model describing conductance of temperatures throughout the pavement as well as the convective terms at the pavement surface, and an energy balance model to predict the solar radiation at the surface of the pavement. As is shown in this paper, the current EICM models over-predict temperatures during hot times and in no-wind conditions. This result implies that the increases in pavement temperatures predicted to occur with climate change is likewise overestimated. Conversely, because the convection coefficient is incorrect, the predicted amount of energy contributing to urban heat islands will also not be correctly predicted using the current EICM models. Although improvements to the solar model are noted, this paper focuses on improvements to the thermal model using modern heat transfer principles and data from the Long-Term Pavement Performance database. This paper improves upon the EICM methodology by correcting the convection coefficient and noting corrections to the solar radiation calculations.

This paper was sponsored by TRB committee AKP00(2) Subcommittee on Sustainable and Resilient Pavements.

TRBAM-21-01332

English

18p

2021

Transportation Research Board 100th Annual Meeting

Digital/other

Figures; References; Tables

Climate change; Heat convection; Heat transfer; Mathematical models; Pavement performance; Solar radiation; Thermal analysis; Urban areas

Environment; Highways; Pavements; Planning and Forecasting

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-01332

TRIS, TRB, ATRI

Dec 23 2020 11:09AM