二灰碎石垂直振动试验方法及评价  

Evaluation of Vertical Vibration Test Method of Lime-Fly Ash-Stabilized Aggregate

作　　者：蒋应军[1] 杨秀荣 李宁方[1] 张毅 董鑫 

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]铜川市交通运输局,陕西铜川727031 [3]陕西省交通厅基本建设工程质量监督站,陕西西安710075

出　　处：《建筑材料学报》2015年第2期351-356,共6页Journal of Building Materials

基　　金：陕西省交通科技项目(12-12K)

摘　　要：结合二灰碎石现场振碾特性,研究了振动压实仪(VVTE)及选型标准,提出了垂直振动试验方法(VVTM),并通过对比研究室内静压法(SPCM)、振动法及现场振碾方式对二灰碎石物理力学特性的影响,评价了不同试件成型方法优越性.结果表明:振动压实仪的工作频率为30Hz,名义振幅为1.2mm,工作质量为300kg时模拟效果最佳,振动120s时的最大干密度与现场所能达到最大干密度相等;垂直振动成型试件的力学强度与芯样强度之比可达90%,而静压法成型试件的力学强度与芯样强度之比不足52%;垂直振动成型试件的力学强度是静压成型试件的1.7倍以上.垂直振动法比静压法成型试件更能准确反映二灰碎石基层物理力学性能.Combined with the actual vibratory-rolling characteristics of lime-fly ash-stabilized aggregate, the vertical vibration compaction equipment（VVTE） and its selection standard were established and the vertical vibration test method（VVTM） was proposed. The effect of indoor static pressure compaction method（SPCM）, VVTM and vibratory-rolling method in site on physical and mechanical properties of lime-fly ash-stabilized aggregate was compared. The different compaction methods were evaluated. The re- sults show that when the working frequency is 30 Hz, the nominal amplitude is 1.2 mm and the working quality is 300 kg, the simulation result is optimal. When the vibratory time is 120 s, the vibratory maxi- mum dry density is equal to the site maximum dry density. The mechanical strength of VVTM specimens is 90% of the sample of site. However, the mechanical strength of SPCM specimen are less than 52% of sample of site. The strength of specimens formed by VVTM is 1.7 times of that formed by SPCM. The specimens formed by VVTM can reflect the physical and mechanical properties of lime-fly ash-stabilized aggregate more accurately than the formed by SPCM.

关 键 词：二灰碎石 垂直振动试验方法 振动参数 最大干密度 抗压强度 劈裂强度 

分 类 号：U416.214[交通运输工程—道路与铁道工程]