高原寒冷地区沥青混合料弯拉特性分析  

Analysis on Flexural Tensile Characteristics of Asphalt Mixture in Cold Plateau Region

作　　者：马骉[1] 韦佑坡[1] 王磊 赵超志 

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]长安大学工程设计研究院,陕西西安710064 [3]陕西省交通建设集团公司,陕西西安710075

出　　处：《公路交通科技》2010年第3期44-48,共5页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技项目(200631800009);中交寒区道路工程重点实验室开放基金资助项目(HSKF2007-04)

摘　　要：针对青藏高原寒冷地区低温、大温差气候特点,通过沥青混合料弯曲试验,分析了温度、沥青种类、油石比、级配等对混合料弯拉特性的影响。试验得出,沥青混合料弯拉强度随着温度的升高呈上凸抛物线形变化,弯拉应变逐渐增大,劲度模量不断减小;改性沥青和高标号沥青混合料的弯拉强度和弯拉应变较大,劲度模量较小;油石比增加时,沥青混合料弯拉强度先线性增大后减小,弯拉应变增大,劲度模量减小;矿料级配越粗,沥青混合料弯拉强度越大。结果表明,温度对沥青混合料弯拉特性的影响较大,采用改性和高标号沥青,适当增加油石比、采用较粗矿料级配,有利于提高沥青混合料的低温弯曲性能。Aimed at the climate feature of low temperature and large temperature difference in Qinghai-Tibet plateau area,effects of temperature,asphalt types,asphalt-aggregate ratio,aggregate gradation on the flexural tensile characteristics of asphalt mixture were analyzed by flexural testing.The test results show that（1） Changing of the flexural tensile strength of asphalt mixture is a convex curve in shape,the stiffness modulus of asphalt mixture reduces with increasing of the flexure tensile strain;（2） The flexural tensile strength and the flexural tensile strain of modified asphalt and high grade asphalt mixture are comparatively large,while the flexure tensile stiffness modulus less;（3） With increasing of asphalt-aggregate ratio,the flexural tensile strength linearly increases at first and decreases afterwards,the flexure tensile strain increases and the stiffness modulus decreases;（4） The flexural tensile strength of the asphalt mixture increases when the aggregate gradation becomes coarse.The results indicate that temperature evidently effects on the flexural tensile characteristics of asphalt mixture.The low temperature flexural tensile characteristics of asphalt mixture can be enhanced by adopting modified asphalt and high grade asphalt,increasing asphalt-aggregate ratio and adopting coarse gradation.

关 键 词：道路工程 弯拉特性 弯曲试验 沥青混合料 温度 

分 类 号：U414.75[交通运输工程—道路与铁道工程]