养生期水泥稳定碎石强度、模量及疲劳损伤特性  

Characteristics of Strength,Modulus and Fatigue Damage for Cement Stabilized Macadam in Curing Period

作　　者：吕松涛[1,2] 郑健龙[1,2] 仲文亮[1,2] 

机构地区：[1]长沙理工大学公路养护技术国家工程实验室,湖南长沙410114 [2]长沙理工大学公路工程教育部重点实验室,湖南长沙410114

出　　处：《中国公路学报》2015年第9期9-15,45,共8页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51208066;51578081);教育部高等学校博士学科点专项科研基金项目(20114316120001);交通运输部应用基础研究项目(2012-319-825-150);河南省交通运输科技计划项目(2013K28);湖南省优秀博士论文基金项目(YB2012B031);公路工程教育部重点实验室(长沙)开放基金项目(kfj120101);广西道路结构与材料重点实验室开放基金项目(2014gxjgclkf-002)

摘　　要：为了揭示养生期水泥稳定碎石强度、模量及疲劳损伤特性,有效减少施工期水泥稳定碎石基层产生的疲劳损伤,进行了不同龄期下水泥稳定碎石材料的无侧限抗压强度、抗压回弹模量、弯拉强度及弯拉疲劳特性研究,揭示了无侧限抗压强度、抗压回弹模量和弯拉强度随龄期的变化规律,建立了不同龄期下无侧限抗压强度与抗压回弹模量之间的相互转换关系,以及不同龄期下水泥稳定碎石材料的疲劳方程与疲劳损伤演化模型。研究结果表明:龄期对水泥稳定碎石的强度、模量与疲劳损伤性能影响显著,龄期越短,荷载对水泥稳定碎石材料产生的损伤越大,施工期造成的疲劳损伤将直接导致路面运营期的疲劳寿命大大缩减,为保证运营期的路面使用寿命,应严格控制短龄期情况下重载车辆的通行,包括施工车辆。In order to reveal the characteristics of strength, modulus and fatigue damage for cement stabilized macadam in curing period and reduce the fatigue damage of cement stabilized macadam base course during the construction, the researches on performances of unconfined compressive strength, compressive resilient modulus, flexural strength and flexural fatigue during different ages were carried out. The change rules of unconfined compressive strength, compressive resilient modulus and flexural strength with ages were revealed. The transformation relationship between the unconfined compressive strength and the compressive resilient modulus, and fatigue equation and fatigue damage evolution model on cement stabilized macadam under different ages were established. The results show that the influence of age on strength, modulus and fatigue damage performances of cement stabilized macadam is significant. The shorter the age is, the greater the damage caused by load to cement stabilized macadam is. Fatigue damage during the construction period will directly reduce the fatigue life in pavement operation periods greatly. In order to ensure the pavement service life in operation period, the passage of the overloading vehicles should be controlled strictly in short age state, including the construction vehicles.

关 键 词：道路工程 水泥稳定碎石 室内试验 加载龄期 强度 模量 疲劳损伤 

分 类 号：U416.217[交通运输工程—道路与铁道工程]