变温低场核磁共振在沥青老化评定中的应用  

Application of Low Field Nuclear Magnetic Resonance of Variable Temperature to Evaluate Asphalt Binder Aged

作　　者：李静 石鹏程[1] 沈菊男[1] LI Jing;SHI Peng-cheng;SHEN Ju-nan(Center for Road Engineering Research,Suzhou University of Science and Technology,Suzhou 215000,China)

机构地区：[1]苏州科技大学道路工程研究中心

出　　处：《北方交通》2019年第11期42-45,共4页Northern Communications

摘　　要：采用低场核磁共振(Low Field Nuclear Magnetic Resonance,LF-NMR)技术来检测沥青在不同温度下的老化状态,分析表明,常温时沥青中有四个峰的信号量,低温时峰数量减少且信号量降低;沥青老化后,常温下表现为峰数量不变但信号量降低,低温下峰数量减少但其信号量比老化前的大;从流变性能测试(Dynamic Shear Rheometer,DSR)可知老化和降温使沥青粘性增大,抵抗形变能力增强。Low field nuclear magnetic resonance was used to detect the aging state of asphalt binder at different temperatures.Results showed that there are four peaks in the asphalt binder at normal temperature.The number of peaks and the signal volume decreased at low temperature.After aging of the asphalt binder,the number of peaks was constant at normal temperature but the semaphore was reduced.The number of peaks at low temperature was reduced but the signal amount was larger than that before aging.From the dynamic shear rheometer,it was known that aging and low temperature increased the viscosity of the asphalt binder and enhanced the resistance to deformation.

关 键 词：变温 低场核磁共振LF-NMR 沥青老化 流变性能测试 

分 类 号：U414.01[交通运输工程—道路与铁道工程]