Research on Key Technologies for Reconstruction and Expansion of Loose Semi-Rigid Base Asphalt Concrete Pavement

Authors

XIAO Guancheng, Guangdong Communication Planning & Design Institute Group Co ., Ltd., Guangzhou , Guangdong 510440 , ChinaFollow

Abstract

Some early-constructed semi-rigid base asphalt concrete pavements have severe looseness in the base layer,which makes it impractical to evaluate the fatigue life of the inorganic binder-stabilized layer for pavement reinforcement under these conditions.This kind of pavement widening project is affected by the condition of the existing pavement condition,raised elevation,traffic management,pavement regeneration,and other factors.Consequently,such projects pose significant challenges in reconstruction and expansion design.To address the key technical issues in reconstructing and expanding loose semi-rigid base asphalt concrete pavements,this article focused on the Shenzhen‒Shanwei West Expressway reconstruction and expansion project.Pavement overlay strengthening and widening techniques were studied through theoretical calculation and practical validation.The results show that by complying with relevant standards and considering pavement condition,the loose cement-stabilized base layer is treated as an unbound aggregate layer,and loose semi-rigid base asphalt pavement is simplified into a layered system comprising asphalt-bound material layer,an aggregate base layer,and the subgrade.A pavement structure reinforcement solution that meets regulatory standards is obtained.For scenarios involving different raised elevations of the existing pavement,factors such as split-width pavement scheme,construction feasibility,and traffic management are considered to obtain tailored pavement levelling solutions.For widening pavement,factors such as project traffic management,traffic distribution,and pavement regeneration need to be considered,and techniques such as step construction,body bolsters,and glass fiber grilles can be applied to enhance the quality of joints in loose base asphalt pavements.The first-stage project of the Shenzhen‒Shanwei West Expressway reconstruction and expansion was completed two years ago,and the pavement remains in good condition.The results confirm the effectiveness of the proposed pavement reconstruction and extension solution,offering insights and references for similar projects.

Publication Date

4-10-2025

DOI

10.14048/j.issn.1671-2579.2025.02.011

First Page

99

Last Page

105

Submission Date

April 2025

Recommended Citation

Guancheng, XIAO (2025) "Research on Key Technologies for Reconstruction and Expansion of Loose Semi-Rigid Base Asphalt Concrete Pavement," Journal of China & Foreign Highway: Vol. 45: Iss. 2, Article 11.
DOI: 10.14048/j.issn.1671-2579.2025.02.011
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss2/11

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