高寒地区水泥稳定碎石抗压强度特性研究  

Study of compressive properties of cement-stabilized macadam in cold plateau regions

作　　者：马骉[1] 刘鹏伟[1] 李宁[1] 王大龙 

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]沈阳公路路政管理局,辽宁沈阳850000

出　　处：《合肥工业大学学报（自然科学版）》2015年第11期1518-1523,共6页Journal of Hefei University of Technology：Natural Science

基　　金："十二五"国家科技支撑计划资助项目(2014BAG05B04);交通运输部建设科技资助项目(2013318490010)

摘　　要：青藏高原寒冷地区特殊的气候环境对水泥稳定碎石半刚性基层性能有较大影响。文章通过标准养生条件与低温养生条件下的水泥稳定碎石混合料抗压强度试验，分析了水泥用量、养生龄期、养生温度对混合料抗压强度和回弹模量的影响。结果表明：标准养生条件下，养生龄期对水泥稳定碎石的无侧限抗压强度和抗压回弹模量有明显影响；7d以前强度增长缓慢，7～28d增长幅度较大，28d后强度增长趋于稳定；养生温度对混合料的无侧限抗压强度与抗压回弹模量的影响较大，0～5℃时，水泥用量较大（5％）的混合料的强度形成较快，5～10℃时不同水泥用量的混合料强度均增长显著，温度高于10℃时3d龄期强度增长幅度大于7d龄期。因此，养生温度高于10℃、水泥用量大于4％时，可满足青藏高原寒冷地区水泥稳定碎石基层的强度要求。The special environment conditions of Qinghai-Tibet Plateau have great impact on the performance of cement-stabilized macadam. Through testing the compressive strength of cement-stabilized macadam under standard maintenance condition and low temperature maintenance condition, the impact of cement dosage, maintenance age and maintenance temperature on the compressive strengtia and resilient modulus of the mixtures is analyzed. The results show that under standard maintenance condition, the maintenance age has significant influence on unconfined compressive strength and resilient modulus of cement-stabilized macadam, the compressive strength grows slowly in the first seven days, and then grows faster in the next 21 days, and it becomes stable after 28 days; the maintenance temperature has large impact on the unconfined compressive strength and resilient modulus, the unconfined compressive strength of mixture with 5% cement dosage grows faster when the temperature is between 0℃ and 5 ℃, the unconfined compressive strength of mixture with different cement dosages increases significantly when the temperature is between 5℃ and 10 ℃, and when the temperature is above 10 ＊C, three-day unconfined compressive strength increases faster than the seven-day. The results indicate that the performance demand of cement-stabilized macadam in Qinghai-Tibet Plateau can be met when the maintenance temperature is above 10 ℃ and the cement dosage is above 4%.

关 键 词：道路工程 水泥稳定碎石 无侧限抗压强度 抗压回弹模量 高原寒冷地区 

分 类 号：U416.223[交通运输工程—道路与铁道工程]