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Large-Size Macadam Mixture Stabilized with Industrial Solid Waste Fly Ash and Slag Powder: A New Mixture to Improve the Performance of Pavement Base Material
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DOI：10.1061/JMCEE7.MTENG-19249.png)
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Abstract
En 中文
Several studies have highlighted that substituting cement with industrial solid waste materials, such as fly ash and slag powder, can enhance the crack resistance of cement-stabilized macadam bases. A mixture incorporating large particle size gravel exhibits an effective skeleton and support mechanism. To address the issue of cracking in conventional cement-stabilized macadam bases, this paper proposes a novel material: large-size macadam mixture stabilized with industrial solid waste fly ash and slag powder (LSM-SWFS mixture). This study proposes a ratio design method aimed at achieving a tightly packed particle arrangement that facilitates an interlocking, dense structure. By replacing cement with fly ash and slag powder as the cementitious components, the LSM-SWFS mixture was prepared using the vibration compaction method. A series of tests, including unconfined compressive strength, compression modulus of resilience, and flexural-tensile strength assessments showed that the unconfined compressive strength and compression modulus of resilience of the LSM-SWFS mixture were slightly lower than those of the conventional cement-stabilized macadam material. However, its 90 days flexural-tensile strength exhibited a significant increase of 24.9%. Additionally, the drying shrinkage rate of the solid waste mortar specimen over 28 days was only 48.6% of that observed in the cement mortar specimen. The enhancement in flexural-tensile strength alongside the reduction in the drying shrinkage rate underscores the efficiency of the LSM-SWFS mixture in mitigating cracking issues.
Keywords:
Road engineering
Large-size macadam
Slag powder
Fly ash
Minimum mineral aggregate (VMA)
Crack resistance
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