摘要
基于局部加载设计了一种评价不含胶结料的沥青混合料骨架强度的试验方法,并研究了混合料类型、岩性、最大公称粒径对骨架强度的影响。通过建立ABAQUS有限元模型,确定贯入阻力试验的压头直径和贯入速率。压头直径为50mm及贯入速率为2.25mm/min时,具有最优的评价效果。对PAC-13,AC-13,Sup-20及Sup-25进行了贯入阻力试验,采用骨架破坏时的最大贯入压力评价沥青混合料的骨架强度,试验结果表明：PAC-13的骨架强度大于AC-13,Sup-25骨架强度大于Sup-20,玄武岩的骨架强度大于石灰岩。含有较多粗集料、最大公称粒径大和集料强度高的混合料具有更高的骨架强度,贯入阻力试验可真实评价沥青混合料的骨架强度。
A test method is designed to evaluate the skeleton strength of unbound asphalt mixture based on local loading,and the influence of mixture type,aggregate type,and nominal maximum aggregate size on skeleton strength is investigated.The diameter of loading head size and penetration rate are determined by ABAQUS finite element method.Results show that loading head with 50 mm in diameter and penetrate rate of 2.25 mm/min have the best evaluation results.Penetration resistance tests are carried out against the PAC-13,AC-13,Sup-20 and Sup-25,and the maximum penetration compression at failure of skeleton is adopted to evaluate the skeleton strength,and it is found that PAC-13＇s skeleton strength is higher than AC-13＇s as Sup-25＇s higher than Sup-20＇s and Basalt＇s higher than Limestone.The asphalt mixture with more coarse aggregate,larger maximum nominal particle size and stronger aggregate strength has higher skeleton strength,and the test can truthfully evaluate the skeleton strength of asphalt mixture.
作者
顾兴宇
章天杰
王晓威
倪富健
栾翔
GU Xing-yu;ZHANG Tian-jie;WANG Xiao-wei;NI Fu-jian;LUAN Xiang(School of Transportation, Southeast University, Nanjing 210096, China;Taizhou City Highway Management Department of Jiangsu Province, Taizhou 225300, China)
出处
《公路》
北大核心
2018年第6期232-238,共7页
Highway
关键词
沥青混合料
骨架强度
贯入阻力试验
有限元模型
asphalt mixture
skeleton strength
penetration resistance test
finite element model
