CTB-50水泥稳定碎石垂直振动试验方法  

CTB-50 vertical vibration compaction method for cement stabilized macadam

作　　者：蒋应军[1] 李升 李明杰 杨明 陈浙江 何岩 易勇 JIANG Ying-jun;LI Sheng;LI Ming-jie;YANG Ming;CHEN Zhe-jiang;HE Yan;YI Yong(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China;Henan Province Traffic Infrastructure Quality Inspection Station,Zhengzhou 450016,Henan,China;Jinhua Communications Investment Group Co.LTD,Jinhua 321015,Zhejiang,China;Xuchang Highway Development Center,Xuchang 461099,Henan,China)

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]河南省交通基本建设质量检测站,河南郑州450016 [3]金华交通投资集团有限公司,浙江金华321015 [4]许昌市公路事业发展中心,河南许昌461099

出　　处：《长安大学学报（自然科学版）》2024年第3期34-42,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：陕西省交通科技项目(21-48K);河南省交通科技项目(2020J-2-2)。

摘　　要：为准确评价最大粒径为53 mm的水泥稳定碎石(CTB-50)的物理力学性质,采用理论分析和室内试验,研究了试件尺寸对CTB-50力学强度测试值的影响,分析了垂直振动试验仪(VVTE)振动参数对CTB-50干密度和级配的影响,开发了CTB-50垂直振动试验方法(VVTM),并通过与现场芯样力学性质对比验证了VVTM可靠性。研究结果表明:随试件尺寸增大,试件松散区的界面效应减弱,试件有效承压面积增大,表现为CTB-50强度测试值增大,当试件尺寸达到200 mm(直径Φ)×200 mm(高h)时,增大试件尺寸对强度不再有显著影响;随工作频率增大,CTB-50干密度先显著增大,当工作频率超过32 Hz时,干密度不再随之变化;随工作质量增大,CTB-50干密度近似抛物线变化,当工作质量为302 kg时干密度达最大,且上车质量122 kg、下车质量180 kg时振动对级配破坏较小;随振动时间延长,CTB-50干密度先显著增大,振动时间超过165 s时干密度不再随之变化。建议CTB-50圆柱体试件尺寸为Φ200 mm×h200 mm,VVTE振动参数为工作频率32 Hz、工作质量302 kg(上车质量122 kg、下车质量180 kg)、名义振幅1.2 mm,确定最大干密度和最佳含水率的振动时间为165 s、制备圆柱体试件的振动时间为120 s;CTB-50的VVTM试件力学强度和现场芯样的相关性达91%。采用垂直振动试验方法成型CTB-50试件合理可行。In order to evaluate the physical and mechanical properties of ultra-large particle size cement stabilized macadam with a maximum particle size of 53 mm accurately(CTB-50),the influence of specimen size on the mechanical strength test values of CTB-50 was investigated using theoretical analysis and laboratory tests.Then the effect of vibration parameters of the vertical vibration compaction testing equipment(VVTE) on the dry density and gradation of CTB-50 was investigated,and the vertical vibration compression testing method(VVTM) of CTB-50 was developed.The reliability of VVTM was verified by comparing the mechanical properties with the field core samples.The results show that with the increase of specimen size,the interfacial effect of the loose area of the specimen becomes weakened and the effective compression area increases,which shows that the test value of CTB-50's strength increase,and increasing the specimen size has no significant effect on the strength when the specimen size reaches Φ200 mm(diameter)×h200 mm(tall).With the increase of working frequency,the dry density of CTB-50 increases significantly,while the dry density does not change significantly when the working frequency exceeds 32 Hz.With the increase of loading weight of working system,the dry density of CTB-50 varies as parabolic approximately,and the dry density reaches the maximum when the working mass is 302 kg.Then the vibration is less destructive to the gradation when the loading weight of upper-system and lower-system is 122 and 180 kg,respectively.With the extension of vibration time,the dry density of CTB-50 increases significantly,while the dry density does not change significantly when the vibration time exceeds 165 s.Therefore,it is recommended that the size of CTB-50 cylindrical specimen is Φ200 mm×h200 mm,the working frequency of VVTE is 32 Hz,while the working mass is 302 kg(loading weight of upper-system of 122 kg,loading weight of lower-system of 180 kg),and the nominal amplitude is 1.2 mm.To determine the maximum dry d

关 键 词：道路工程 路面基层 超大粒径 水泥稳定碎石 垂直振动试验方法 力学强度 

分 类 号：U416.21[交通运输工程—道路与铁道工程]