沥青混合料二点梯形梁与四点小梁疲劳试验方法对比

发布时间：2018-01-13 14:24

本文关键词：沥青混合料二点梯形梁与四点小梁疲劳试验方法对比　出处：《重庆交通大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：小梁疲劳试验是广泛应用的沥青混合料疲劳试验方法,两点梯形梁疲劳试验(two-point trapezoidal beam fatigue test,2PB)主要在欧洲应用而四点弯曲小梁疲劳试验(four-point bending beam fatigue test,4PB)在美国应用广泛。从试验标准、试件要求、老化条件、试验操作和结果应用等方面进行2PB与4PB的对比,指出2PB试验中试件成型复杂,试件尺寸精度要求高,对设备要求复杂,但试件具有较好均匀性和代表性;4PB试件成型较简单,试件尺寸易满足。2PB试件黏附、固定、更换费时,操作上繁琐一般最大加载应变500με;4PB试验中试件固定、更换、调整应变等直接通过软件实现,操作容易,最大加载应变可达到2 000με。2PB疲劳试验试件数要求多,获取疲劳曲线试验周期为4PB试验的两倍以上。2PB试验后试件表面可见裂纹,测量结果对应混合料的实际疲劳寿命而4PB测量疲劳寿命结果较保守。2PB疲劳结果离散性小于4PB结果,2PB结果可用于混合料疲劳性能评价以及作为路面设计输入参数,4PB结果仅用于混合料疲劳性能的评价。
[Abstract]:Trabecular fatigue test is a widely used asphalt mixture fatigue test method. Two-point trapezoidal beam fatigue test. 2PBs are mainly used in Europe and four-point bending beam fatigue test. 4PB2) is widely used in the United States. The comparison of 2PB and 4PB in test standard, specimen requirement, aging condition, test operation and result application shows that 2PB test specimen is complex in forming. The size accuracy of the specimen is high and the requirement to the equipment is complex, but the specimen has good uniformity and representativeness. 4the specimen of PB is relatively simple to be formed, and the specimen size is easy to meet the requirements of adhesion, fixation and replacement of the specimen. The maximum strain of 500 渭蔚 is usually loaded on the complicated operation. 4The specimen is fixed, replaced and strain adjusted directly by software in PB test, which is easy to operate, and the maximum loading strain can reach 2 000 渭蔚 .2PB fatigue test. The fatigue curve test period is more than twice that of 4PB test. The measured results correspond to the actual fatigue life of mixture, and the dispersion of fatigue life measured by 4PB is less than that by 4PB. 2PB results can be used to evaluate the fatigue performance of mixtures and 4PB as input parameters for pavement design.
【作者单位】：同济大学道路与交通工程教育部重点实验室;河北省交通规划设计院;
【基金】：国家自然科学基金面上项目(51478351) 河北省交通运输厅科技计划项目(Y-2013096)
【分类号】：U414
【正文快照】： 室内疲劳试验采用试验室成形试件或现场钻芯试件,通过简单、快速的试验评价混合料的疲劳性能,具有可重复、简便快速等特点,弯曲梁疲劳试验因操作简便、具有更好的现场应力响应模拟性而广泛应用。在弯曲梁疲劳试验方法中,有梯形梁疲劳试验(2PB)和四点弯曲小梁疲劳试验(4PB),其

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