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原文传递 Development of Improved Overlay Thickness Design Alternatives for Local Roads Illinois Center for Transportation.

题名：	Development of Improved Overlay Thickness Design Alternatives for Local Roads Illinois Center for Transportation.
作者：	Tutumtuer, E.
关键词：	Nondestructive testing (NDT), Mechanistic-Empirical (M-E) Pavement Design Guide, Illinois (state), Low-volume roads, Falling weight deflectometer (FWD), Pavement overlays, Design methods, Damage algorithms, Pavement condiditions, Thickness design, Structural characteristics, Traffic characterisics
摘要：	In this research study, 20 pavement sections were selected from six counties in Illinois, with varying structural and traffic characteristics. Falling weight deflectometer (FWD) tests were conducted on these road segments to determine and monitor the structural conditions of both the existing and HMA overlaid pavement sections. Then the corresponding required overlay thicknesses were determined using three different methods—the AASHTO 1993 nondestructive testing (NDT) method, the IDOT modified layer coefficients method, and the Asphalt Institute deflection approach—that are currently used by local agencies including municipalities, counties and townships. Inadequacies of the currently available methods to properly account for the pavement structural conditions were highlighted. Accordingly, a new mechanistic-empirical (M-E) overlay design method was developed to adequately assess the structural conditions of existing pavements and subsequently recommend required thickness values from FWDbased critical pavement responses computed and compared with threshold values for the preestablished fatigue and/or rutting damage algorithms. The M-E overlay design method successfully identified structural deficiencies in the original pavement configurations through FWD NDT and subsequently resulted in reliable and cost-effective overlay solutions, as compared with the IDOT modified layer coefficients method.
总页数：	Tutumtuer, E.
报告类型：	科技报告