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Performance Evaluation of Huning Highway Test Sections using the

NCHRP 1-37A Mechanistic-Empirical Design Guide

Yanqing Zhao

Ph.D.

Jiangsu Transportation Research Institute

223# Shui Xi Men Street, Nanjing 210017, People’s Republic of China

Tel.: 86-25-86522475, yzhao@ti.js.cn

Jia Yu

Vice Chief Engineer

Jiangsu Transportation Research Institute

223# Shui Xi Men Street, Nanjing 210017, People’s Republic of China

Tel.: 86-25-86522475, jy@ti.js.cn

ABSTRACT:

The mechanistic-empirical pavement design method developed under the NCHRP 1-37A project was used in this study to evaluate the performance of two asphalt pavement test sections constructed in Huning highway widening project in Jiangsu province, China. The two test sections were constructed with an asphalt treated base and a cement stabilized base course, respectively. Semi-rigid base courses are currently widely used in highway construction projects in China. Unfortunately, the model for flexible pavements with semi-rigid bases has not been calibrated in the current version of the M-E Design Guide software, which presents a major obstacle in the implementation of the Design Guide in China. The input data for traffic, climate, and asphalt mixtures were all collected at a project level (level 1) in this study. It was found that the traffic load spectra collected from Huning highway are much heavier than the default load spectra used in the Design Guide software that represent average values in U.S. Thus questions arise regarding the applicability of the Design Guide to pavements subjected to heavy axle loads and high tire pressures typically existing in highway networks in China, since the performance models in the Design Guide were calibrated using data mostly collected in North America. Also preliminary results show some unreasonable rutting predictions. The predicted results are to be evaluated base on field performance measurements and local experiences.

PRESENTERS’ QUESTIONS:  We would like to receive comments, suggestions, and feedback from the meeting's attendees on the following matters:

1-

Calibration of the model for flexible pavements with semi-rigid base courses in the NCHRP 1-37A M-E Design Guide.

2-

Applicability of the M-E Design Guide to pavements subjected to heavy axle loads and high tire pressures.

3-

Reasonableness of the prediction results obtained in this study.

PRESENTERS’ STATEMENT:  This work is still in progress, and has not been submitted for presentation or publication at another meeting.

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