Research on performance improvement of multiple hot in-place recycled asphalt mixture
LI Ning
LI Long
LI Jin
MENG Lingguo
LI Jing
Abstract：In order to improve the performance of multiple hot in-place recycled mixtures,high permeability regenerants and basalt short-cut fibers were incorporated into the design of multiple recycled mixtures,and their road performance and fatigue perfor-mance were verified.The results show that the high-temperature performance of recycled asphalt mixtures increases with the increase of the number of recycling times,while the low-temperature performance,water stability and fatigue performance decrease with the in-crease of the number of recycling times.Compared with the conventional recycling agent,the dynamic stability of secondary recycled asphalt mixtures made with high penetration recycling agent decreased by 21.5%,the max flexural-tensile strain increased by 54.7%,the freeze-thaw splitting strength in water stability increased by 2.9%,the water-soaking residual stability ratio increased by 5.5%,and the fatigue performance increased by 14.7%,7.9%,and 6.6%at the strain levels of 300 με,350 με,and 400 με,respectively.The addi-tion of basalt short-cut fibers can improve the fatigue performance of tertiary recycled asphalt mixtures by 12.0%,3.1%,and 6.4%at 300 με,350 με,and 400 με strain levels,respectively,but the improvement of their road performance is small.
Keywords：road engineeringrecycled asphalt mixturemultiple recyclingrejuvenatorbasalt fiber
Publication Date：2025-03-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 61-64,86 )