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Abstract

Based on the reconstruction and expansion project of a certain expressway, this paper adopted the falling weight deflectometer (FWD) to detect the deflection of the reconstruction, expansion, and new and old overlap positions, thus evaluating the balance of the new and old pavement structures in the reconstruction and expansion. By combining the construction process investigation, the influencing factors of the balance of the new and old pavement structures were analyzed, with measures for controlling the balance of the new and old pavement structures in the reconstruction and expansion proposed. The results show that after adding 6 cm AC-20C, the deflection value of the overtaking lane on the old road surfaces decreases by about 50%, and the deflection value of the heavy lane on the old road surfaces decreases by about 61.5%, with the strength of the road structure significantly improved. The representative deflection value in the overlap area of the new and old pavement reaches 19.6 (0.01 mm), which is significantly higher than the deflection values in other positions of the new and old pavement structures. The balance of the new and old pavement structures is relatively low. Additionally, the balance of the new and old pavement structures in the reconstruction and expansion of expressways is related to the treatment of old pavement structure diseases and the refinement level of new and old pavement overlap construction. By conducting construction control, the balance of pavement structures can be improved by about 60%.

Publication Date

11-8-2022

DOI

10.14048/j.issn.1671-2579.2022.05.009

First Page

50

Last Page

55

Submission Date

April 2025

Reference

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