水泥-沥青胶凝材料动态力学行为的初步研究  

INVESTIGATION ON DYNAMICAL MECHANICAL BEHAVIORS OF CEMENT-ASPHALT BINDERS

作　　者：刘永亮[1] 孔祥明[2] 阎培渝[1] 

机构地区：[1]清华大学土木工程系,北京100084 [2]结构工程与振动教育部重点实验室,北京100084

出　　处：《工程力学》2011年第7期53-58,共6页Engineering Mechanics

基　　金：自然科学基金项目(50802050);国家十一五科技支撑计划课题子课题项目(2006BAJ05B03);铁道部科技研究计划重大课题项目(2008G031-18)

摘　　要：研究了不同沥青含量(A/C)的水泥-沥青复合胶凝材料7d龄期的动态黏弹性力学行为。选择3种温度环境(?25℃、25℃和75℃),采用动态黏弹谱仪测试了3种不同A/C的水泥-沥青胶凝材料(简称为CAB)在频率范围0.1Hz^100Hz的动态力学性能,获得了不同温度下储存模量、损耗模量及损耗角随加载频率变化的基本规律。基于频-温等效原理建立了常温下CAB的储存模量随频率变化的主曲线,并利用Burgers本构关系对其动态力学行为进行了模拟。结果表明:随A/C和温度的升高,CAB的储存模量减少,黏弹性显著增强;低A/C的CAB,或低温下高A/C的CAB,其储存模量随频率的对数线性增加;随A/C和温度的升高,逐渐出现非线性递增规律;随A/C的升高,主曲线频幅变窄,表明模量对频率的敏感性增大;Burgers黏弹性力学模型可用于表征不同A/C的CAB动态模量与频率的关系,与实验数据吻合较好。The dynamic vicoelastic behaviors of cement asphalt gelled composites with varied asphalt content at the age of 7 days were investigated.The correlation between the storage modulus,loss modulus or loss angle and the loading frequency was obtained through testing dynamic mechanical properties of cement-asphalt binders（CABs for short） with different A/C ratios over a frequency range from 0.1Hz to 100Hz by Du Pond DMA 2980 at the temperature of ？25℃,25℃ or 75℃ respectively.Mater curves of the storage modulus of different CABs with frequency under normal temperature were established based on the frequency-temperature equivalence principle and Burgers constitutive relationship was used to simulate the dependency of a dynamic modulus on a loading frequency.Results indicated that,with the increase of A/C ratio or temperature,the storage modulus of CABs decreased and their viscoelaticity became increasingly remarkable.The storage modulus of CABs with a low A/C ratio or a high A/C ratio but under low temperature ascended linearly with a logarithmic frequency,while it behaves nonlinear growth when the A/C ratio or temperature turned higher.The frequency range for mater curves of CABs＇ storage modulus got narrow with the A/C ratio,implying higher frequency sensitivity.The relationship between the dynamic modulus and frequency for three different CABs was successfully simulated by means of a Burgers mechanical model and the calculated results fitted well with experimental data.

关 键 词：水泥-沥青胶凝材料 储存模量 动态模量 频-温等效 本构关系 黏弹性 

分 类 号：U214.99[交通运输工程—道路与铁道工程]