Mainline Asphalt Paving Completed on Jilin Songchang Expressway Constructed by China Railway

en.Wedoany.com Reported - On November 3, the mainline asphalt pavement paving was completed on the Songjianghe–Changbai Expressway (Songchang Expressway), in which China Railway Sixth Group under China Railway participated in construction, achieving mainline breakthrough. The project has a total length of 114.33 kilometers, and China Railway Sixth Group Tianjin Company undertook the asphalt pavement construction task for 52 kilometers of it. China Railway released the news on November 6, disclosing the project construction progress.

The Songchang Expressway is located in southeastern Jilin Province, starting at Guosong Village, Donggang Town, Fusong County, and ending at Yanjiang Village, Malugou Town, Changbai County. It is an important transportation route connecting the northeastern hinterland of Jilin Province with the China–DPRK border area. After the project is completed and opened to traffic, it will end the history of Changbai Korean Autonomous County having no expressway access, improve the expressway network in the southeastern border area of Jilin, and provide a new corridor for resource transportation and regional traffic connections along the route.

The project route lies in a high-latitude seasonally frozen soil area, with severe cold and long winters, a short effective construction period, and dense distribution of bridges and tunnels, with frequent transitions between subgrade and bridge-tunnel structures, placing high demands on the continuity of asphalt pavement paving, joint treatment, and smoothness control. The construction team controlled the height difference of pavement joints to within 2 millimeters and established special quality control measures focusing on asphalt material temperature, paving technology, and joint treatment.

During construction, the project team implemented full-process insulation monitoring for asphalt mixing, transportation, paving, and rolling to reduce the impact of temperature changes on material construction performance. For the joints between new and old pavement, hot-air equipment was used for precise preheating, followed by graded rolling to complete joint treatment. Before construction, process parameters were also determined through test sections, work instructions were prepared and promoted across the entire line, and automatic leveling systems were configured for paving equipment to maintain continuous and uniform operation of the paver and control pavement smoothness and compaction quality.

As the remaining works and acceptance work of the project proceed, once the line is completed and opened to traffic, it will further improve the external transportation conditions of Changbai Korean Autonomous County and areas along the route, and strengthen highway connections between southeastern Jilin Province and the border areas.