摘要
重复荷载作用下沥青混合料永久变形可分为三个阶段,经验模型可以用于描述混合料蠕变曲线的前两阶段,第一、二阶段分界点F_S在工程中具有重要的应用。认为当取样间隔间△ε_p<3%时对应点为F_S,通过两种混合料不同试验条件,结果发现,截距(a)随温度及偏应力变化规律性不强;斜率(b)值随着偏应力增大而变大、随着围压增加而变小;F_S受围压的影响比较小,但随着偏应力的增加而变大。
Asphalt mixture' s permanent deformation can be divided into three stages under repeated load, experiential model can describe the first two stages of mixture' s creep curve, and the cut - off of first two stages Fs which play a good role in engineering application. It is deemed that Fs is occurred when below 3%. Under different test conditions two types mixtures' results indicated that intercept have a bad laws under different temperatures and deviator stress; slope b become larger along with higher deviator stress, and become smaller along with higher confining stress; however confining stress have little impact on Fs, and Fs become larger along with higher deviator stress.
出处
《石油沥青》
2010年第1期34-38,共5页
Petroleum Asphalt
基金
交通部科技项目(项目编号:2006 318 00004)
江苏省交通科学研究计划项目(项目编号:No.08Y38)
关键词
蠕变特性
经验模型
FS
截距
斜率
围压
偏应力
creep characteristic
experiential model
Fs
intercept
slope
confining stress
deviator stress