大厚度水泥稳定碎石性能及微观结构研究

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【中图分类号】：U414 【文献标志码】：A 【文章编号】：1008-3197（2025）04-61-06

【DOI编码】：10.3969/j.issn.1008-3197.2025.04.014

The Performance and Microstructure of （CSM） Large-thick Cement-stabilized Macadam

ZHNAG Shengyu'，LI Jianwei1，XIAO Qingyi2*，LU Haitao1，MA Xiaoming1，CHENDewei1 （1.CangzhouRoadandBridgeConstructioGoupCo，Ltd.，Cangzhou6099，China;2.ShoolofCivilandTransportionEngieing， Hebei University of Technology，Tianjin 300401）

【Abstract】：To investigate the feasibilityof thecompaction techniqueforlarge-thicknesscement-stabilized macadam （CSM）and to reveal its compaction mechanism and characteristics，this study builds upon conventional indoor tests with increased forming height of the specimens.Standard-sized specimens were extracted from the lower portion under the forming pressure and subjected to laboratory mechanical performance tests.Industrial CT and image processng techniques were employed to acquire the internal structural characteristics of the specimens.A comparative analysis was conducted on the mechanical properties of the two diferent forming methods on the mechanical properties of cement-stabilized macadam（CSM）.The results indicate that the unconfined compressive strength，spliting tensile strength，flexural tensile strength，and dynamic modulusof the thick-layer cement-stabilized macadam specimens showed minimal difference compared to the conventional specimens.The porosityof each cross-section remained within therange of 1.3 to 3.0.The bottom of the thick-layer specimens exhibited the highest porosity，the greatest number of elongatedvoids and the largest fractal dimension. These meso-structural indicators suggest that the performance metrics of the bottom structure in large-thicknesscement-stabilized macadam（CSM）are slightly inferior to those of the bottm structureof conventional specimens.Through the integration of macroscopic mechanical testing and microscopic industrial CTanalysis，this study elucidates the mechanical strength performance and internal structural characteristics during the compaction process of large-thickness cement-stabilized macadam （CSM）.

[Key words】： large-thickness cement-stabilized macadam（CSM）;microstructure；mechanical properties

我国高等级公路基层 90% 以上是水泥稳定碎石结构。（剩余8318字）