摘要
为研究不同施工温度下作为路基填料的可回收沥青路面(RAP)材料的蠕变特性,针对沥青成分具有黏附性和温度敏感性的特点,开展了击实温度为0℃和50℃时RAP试样的直剪试验和蠕变试验.直剪试验结果表明:相同击实温度下,竖向应力越高,抗剪强度越大,达到峰值剪应力对应的剪应变越大;抗剪强度指标随击实温度升高而增加.直剪蠕变试验结果表明:相同剪应力比下,击实温度越高,蠕变破坏时间越长;相同击实温度下,竖向应力越大,蠕变破坏时间越长;临界剪应力比随击实温度升高呈线性增加.通过揭示3个参数经验蠕变模型中各参数随击实温度的定量变化规律,建立考虑击实温度影响的修正蠕变模型.工程应用中建议在夏季施工,以提高击实温度,从而增加临界应力比,提高抗蠕变性能.
To investigate the creep behavior of recycled asphalt pavement(RAP)as backfill material at different construction temperatures,with considerations of viscosity and temperature sensitivity of asphalt,the direct shear and direct shear creep tests on RAP specimens were conducted at 0℃and 50℃.The direct shear test results show that at given compaction temperature,the shear strength is increased with increasing of vertical stress,and the shear strain corresponding to the maximum shear stress is increasesd.The shear strength is increased with the increasing of compaction temperature.The direct shear creep tests results show that at given shear stress ratio,the time to creep rupture is increased with the increasing of compaction temperature.Under the same compaction temperature,the time to creep rupture is increased with the increasing of vertical stress.The critical shear stress ratio is increased linearly with the increasing of compaction temperature.The modified creep model is proposed with considering the effect of compaction temperature by revealing the quantitative variation law for each parameter of the empirical three-parameter creep model.The construction of RAP as backfills is recommended in the summer to achieve high compaction temperature and increase the critical stress ratio for improving creep resistance.
作者
殷杰
王星光
胡明明
汤勇
YIN Jie;WANG Xingguang;HU Mingming;TANG Yong(Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2020年第4期478-483,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51978315)。
