摘要
为研究不同成型工艺对水泥稳定碎石宏观性能的影响,基于骨架密实和悬浮密实2种级配,分别采用强制搅拌静压成型、强制搅拌振动压实、振动搅拌静压成型、振动搅拌振动压实4种工艺制备了8种水泥稳定碎石,采用7 d无侧限抗压试验、28 d单轴贯入试验、7 d温缩试验和7 d干缩试验对水泥稳定碎石宏观性能进行了研究,同时结合扫描电子显微镜微观手段,分析了水泥稳定碎石宏观性能变化机理。结果表明:振动搅拌振动压实工艺下骨架密实级配的水泥稳定碎石力学性能最优,其7 d无侧限抗压强度和28 d单轴压缩模量较强制搅拌静压成型分别提升了169.5%、97.2%。采用振动搅拌振动压实工艺可以促使水泥水化产物生成量增多、结构完善,整体均匀性提高,进而改善水泥稳定碎石宏观性能。
In order to study the effects of molding process on the macroscopic performances of cement stabilized gravel,based on two kinds of gradation of skeleton compaction and suspension compaction,eight kinds of cement stabilized gravel were prepared by four kinds of processes:static compaction molding with forced mixing,vibratory compaction with forced mixing,static compaction molding with vibratory mixing,and vibratory compaction with vibratory mixing.Furthermore,the macro-performances of cement stabilized gravel were investigated by adopting the 7 d unconfined compression test,the 28 d single-axis penetration test,the 7 d warming shrinkage test,and the 7 d drying shrinkage test.The underlying microscopic mechanism of the macroscopic property varia⁃tion of the cement stabilized gravel was analyzed by combining with the microscopic means of scanning electron microscope.The results show that the mechanical properties of cement stabilized gravel with skeleton dense grading under vibration mixing and vibra⁃tion compaction process are optimal,and its 7 d unconfined compressive strength and 28 d uniaxial compression modulus are improved by 169.5%and 97.2%,respectively,compared with that of forced mixing and static compression molding.The vibration mixing vibration compaction techniques can improve the macro performance of cement stabilized crushed stone in terms of promoted the cement hydration product generation,perfect structure,and elevated overall uniformity.
作者
郝培文
齐梓超
李天洋
HAO Peiwen;QI Zichao;LI Tianyang(School of Highway,Chang’an University,Xi’an 710064,China)
出处
《中国科技论文》
CAS
2024年第4期468-474,共7页
China Sciencepaper
基金
云南省交通运输厅科技项目(NY-FW-GCHT-18)。
关键词
振动搅拌
振动压实
宏观性能
扫描电子显微镜
成型工艺
vibratory mixing
vibratory compaction
macroscopic properties
scanning electron microscope(SEM)
molding technologies
