复合多聚磷酸改性沥青混合料高温蠕变特性与本构关系研究  

Study on High Temperature Creep Properties and Constitutive Structure Relation of Composite Polyphosphate Modified Asphalt Mixes

作　　者：李超[1] 李金成 赵延庆[2] 王岚[1] Li Chao;Li Jincheng;Zhao Yanqing;Wang Lan(Key Laboratory of Civil Engineering Structure and Mechanics,Inner Mongolia University of Technology,Hohhot 010051,China;School of Transportation,Dalian University of Technology,Dalian 116000,China)

机构地区：[1]内蒙古工业大学内蒙古自治区土木工程结构与力学重点实验室,内蒙古自治区呼和浩特010051 [2]大连理工大学交通运输学院,辽宁大连116000

出　　处：《市政技术》2023年第3期1-6,157,共7页Journal of Municipal Technology

基　　金：内蒙古自治区自然科学基金(2020LH01004);博士基金(BS2020042);高校科技英才(NJYT22079)。

摘　　要：为了研究复合多聚磷酸(PPA)改性沥青混合料的高温蠕变特性,采用三轴重复蠕变恢复试验,根据竖向永久变形、应变速率和流动指数指标,对比分析了不同条件下SBS改性沥青混合料与PPA+SBS复合改性沥青混合料高温蠕变特性;综合运用黏弹塑性力学和损伤力学理论,建立了重复荷载作用下沥青混合料竖向永久变形的蠕变损伤力学模型。研究结果表明:在不同温度和应力水平下,PPA+SBS复合改性沥青混合料竖向永久变形和应变速率均小于SBS改性沥青混合料,但其流动指数却远大于SBS改性沥青混合料;将Burgers模型中串联的黏壶替换为黏塑性元件所形成的损伤本构模型,可以全面反映沥青混合料三阶段的竖向永久变形特性。In order to study the high temperature creep properties of composite polyphosphoric acid(PPA)modified asphalt mixtures,the high temperature creep properties of SBS and PPA+SBS modified asphalt mixtures were compared by triaxial repetitive creep recovery test under different conditions based on indicators of vertical permanent deformation,strain rate and flow index(FN);By viscoelastic-plastic and damage mechanics theory,the creep damage mechanics model for the vertical permanent deformation of asphalt mixtures under repeated loading was established.The results show that both the vertical permanent deformation and strain rate of the PPA+SBS composite modified asphalt mixture are smaller than those of the SBS one at different temperatures and stress levels,while the flow index is much larger than that of the SBS one;The damage constitutive model formed by replacing the viscoplastic element with the viscoplastic element of Burgers model can fully reflect vertical permanent deformation characteristics of the asphalt mixtures at three stages.

关 键 词：复合多聚磷酸改性沥青混合料 三轴重复蠕变恢复试验 竖向永久变形特性 蠕变损伤力学模型 

分 类 号：U414[交通运输工程—道路与铁道工程]