作者：奚晨晨1,2, 严守靖1,2, 魏金涛1,2, 孙团伟1,2, 张伟3
作者单位：1. 浙江省交通运输科学研究院，浙江 杭州 310023;
2. 浙江省道桥检测与养护技术研究重点实验室，浙江 杭州 310023;
3. 中铁隧道局集团有限公司市政工程公司，浙江 杭州 310023
关键词：高黏沥青;多重应力蠕变恢复试验(MSCR);老化程度;高温性能;蠕变恢复率;应力敏感因子
摘要：
基于多重应力蠕变恢复试验（MSCR）研究3种高黏沥青在不同老化程度下的高温性能的影响，采用蠕变恢复率及不可恢复柔量评价不同老化条件下高黏沥青高温抵抗外界荷载作用能力，并分析高黏沥青的应力敏感性。研究表明：经短期老化与长期老化后，高黏沥青老化后变得更坚硬，且Ⅰ型高黏沥青在不同应力和不同老化条件下抗变形能力最优。不同老化条件下，Ⅰ型与Ⅱ型高黏沥青的平均蠕变恢复率均高于SBS改性沥青，平均不可恢复柔量均小于SBS改性沥青，表明添加高黏改性剂对提高沥青的弹性恢复性能与高温抗流动变形能力具有明显作用。3种高黏沥青在不同老化程度下的应力敏感性大小为Ⅱ型＜Ⅰ型＜SBS改性沥青，与其蠕变恢复率大小顺序相反，说明应力敏感性与平均蠕变恢复率具有良好的负相关性。结果表明：多重应力蠕变恢复试验考虑不同老化条件下高黏改性沥青的高温黏弹特性，采用平均蠕变恢复率、平均不可恢复柔量和应力敏感系数指标，对全面评价高黏改性沥青的不同老化程度下高温性能具有重要作用。
High temperature performance evaluation of high viscosity asphalt with different aging degrees based on MSCR test
XI Chenchen1,2, YAN Shoujing1,2, WEI Jintao1,2, SUN Tuanwei1,2, ZHANG Wei3
1. Zhejiang Scientific Research Institute of Transport, Hangzhou 310023, China;
2. Key Laboratory of Road and Bridge Detection and Maintenance Technology Research of Zhejiang Province, Hangzhou 310023, China;
3. Municipal Engineering Company, China Railway Tunnel Group Co., Ltd., Hangzhou 310023, China
Abstract: In this paper, multiple stress creep recovery test (MSCR) was used to study the effects of three kinds of high viscosity asphalt on the high temperature performance under different aging degrees. The high temperature load resistance and stress sensitivity of high viscosity asphalt under different aging conditions were evaluated by creep recovery rate and non-recoverable compliance. The results show that after short-term aging and long-term aging, the high viscosity asphalt becomes harder after aging, and the deformation resistance of type I high viscosity asphalt is the best under different stress and aging conditions. Under different aging conditions, the average creep recovery rate of type I and type II high viscosity asphalt is higher than that of SBS modified asphalt, and the average unrecoverable compliance is lower than that of SBS modified asphalt, indicating that the addition of high viscosity modifier plays a significant role in improving the elastic recovery performance and high-temperature flow deformation resistance of asphalt. The stress sensitivity of three kinds of high viscosity asphalt under different aging degree is in reverse order with creep recovery rate, which indicates that there is a good negative correlation between stress sensitivity and average creep recovery rate of three kinds of high viscosity bitumen. It shows that the stress sensitivity of three kinds of high viscosity bitumen is different from that of SBS modified asphalt. The results show that the high temperature viscoelastic properties of high viscosity modified asphalt under different aging conditions are considered in the multi-stress creep recovery test. The average creep recovery rate, the average non-recoverable flexibility and the stress sensitivity coefficient are adopted in the multi-stress creep recovery test. It plays an important role in evaluating the high temperature performance of high viscosity modified asphalt at different aging degrees.
Keywords: high viscosity asphalt;multiple stress creep recovery(MSCR) test;aging degrees;high temperature performance;creep recovery rate;stress sensitive factor
2024, 50(4):153-159 收稿日期: 2022-04-09;收到修改稿日期: 2022-05-28
基金项目: 浙江省科研院所研究开发专项（ZK202202）；浙江省科技攻关计划（2021C01106）
作者简介: 奚晨晨(1993-),男,安徽芜湖市人,助理工程师,硕士,研究方向为道路结构与材料。
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