沥青混合料相位角预估模型  

Prediction model of phase angle of asphalt mixture

作　　者：张倩[1] 范哲哲 张尚龙[1,3] 李彦伟 石鑫 ZHANG Qian;FAN Zhe-zhe;ZHANG Shang-long;LI Yan-wei;SHI Xin(School of Civil Engineering, Xi＇an University of Architecture and Technology, Xi＇an 710055, Shaanxi, China;School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467000, Henan, China;School of Civil Engineering, Hexi University, Zhangye 734000, Gansu, China;Transportation Bureau of Shijiazhuang, Shijiazhuang 050001, Hebei, China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]河南城建学院土木与交通工程学院,河南平顶山467000 [3]河西学院土木工程学院,甘肃张掖734000 [4]石家庄交通运输局,河北石家庄050001

出　　处：《长安大学学报（自然科学版）》2018年第2期19-25,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：陕西省自然科学基础研究计划项目(SJ08E208);河北省交通科技项目(Y-2010090);陕西省教育厅专项科研计划项目(12JK0795)

摘　　要：为了给沥青路面材料设计提供科学依据,针对沥青混合料黏弹性特性,依托简单性能试验(SPT)结果,分析加载频率与温度耦合作用下相位角的变化特征,基于这一规律,提取不同温度T下相位角随加载频率的变化曲线,以拐点温度区为阈值,将整个试验过程划分为T≤25℃、25℃<T<30℃、T≥30℃这3个温度段,引入温度、频率、材料级配等参数。首先采用控制变量法对各个因子与相位角的相关性进行分析论证,确定各参变量的引进形式;然后采用Levenberg-Marquadt方法结合通用全局优化算法对试验数据进行综合处理,提出包含温度、频率、油石比、空隙率和级配特性等因素的相位角预估模型。研究结果表明:每种混合料都存在一个拐点温度,拐点温度附近,无论频率如何变化,相位角基本恒定;温度低于拐点温度时,相位角随加载频率的增加而降低,温度高于拐点温度时,相位角随加载频率的增加而增加;中、高温条件下改性剂的作用越来越明显,导致T≤25℃时的预估精度明显高于T≥30℃时的预估精度,因此对高温状态相位角的预估要分别考虑基质沥青和改性沥青2种情况,但在引入油石比、空隙率对预估模型进行修正后,避免了高温状态需针对沥青类型分别预估的问题,提高了预估精度,且模型相关系数较高。To provide scientific basis for asphalt pavement material design,simple performance test（SPT）was conducted to study viscoelastic property of asphalt mixtures.Changing rule of phase angle was analyzed under the coupling action of loading frequency and temperature.Based on this law,the curves of phase angle changing with loading frequency at different temperatures were extracted.Based on three temperature segments of T≤25 ℃、25 ℃ T30 ℃ and T ≥30 ℃,parameters of temperature,frequency,and material gradation were introduced by takingturning point temperature zone as threshold value.Control variable method was used to demonstrate the correlation between each factor and the phase angle so as to determine the introduction form of each parameter.Then the Levenberg-Marquadt method and the general global optimization algorithm was used to deal with the experiment data synthetically.The prediction model of phase angle,including temperature,frequency,oil stone ratio,voidage rate and gradation characteristic was proposed.The results show that there is a turning point temperature in each mixture.No matter how the frequency changes,phase angles almost keep the same near the turning point temperature.When the temperature is lower than the turning point temperature,phase angle decreases with the increase of loading frequency.When it＇s higher than the turning point temperature,phase angle increases with the increase of loading frequency.Under the condition of medium and high temperature,the effect of modifier becomes more significant,which makes the prediction accuracy under T≤25 ℃is significantly higher than that of under T≥30 ℃.Therefore the forecast of phase angle under the state of high temperature is divided into two situations as the matrix asphalt and modified asphalt.However,after introducing the oil stone ratio,ratio to revise the forecast model,the trouble of separate estimates of the asphalt type at high temperature is avoided,and the forecast accuracy is improved.The model correlation coeffici

关 键 词：道路工程 预估模型 分段预估 相位角 沥青混合料 

分 类 号：U414[交通运输工程—道路与铁道工程]