沥青混合料汉堡车辙试验评价研究综述

为规范使用汉堡车辙试验(Hamburg wheel-track device,HWTD)评价沥青混合料的高温抗车辙性能和水稳性能,科学地指导试验操作程序、相关数据处理和评价指标计算等,总结和探讨了HWTD相关的试验条件、圆柱型试件影响因素、车辙深度预测模型、点位选取原则、评价指标的获取与计算方法等的现状和存在的问题,并展望了进一步的研究方向。研究结果表明,试验条件直接影响着混合料的性能评价,其试验温度、评价标准和荷载作用次数等的确定与选取应充分考虑沥青等级和环境气候的差异;并基于圆柱型试件拼接缝对混合料受力特性和车辙深度点位选取的影响,提出了相应的改善措施。相关评价指标计算模型的引入弥补了现有个别评价指标求取不明确的缺陷,为混合料性能的科学评价和区分提供指导,也为我国相关HWTD规范的制定奠定基础。

Review on Hamburg Wheel-track Device Evaluation of Asphalt Mixture

To standardize the evaluation of rutting resistance and water stability of asphalt mixture by using Hamburg wheel-track device (HWTD) and scientifically direct test operation, relevant data processing and calculation of evaluation indexes, the current situation and existing problems of HWTD such as relevant test condition, influence factor of cylindrical specimen, prediction model of rutting depth, selecting principle of spotting and calculational method of evaluation indexes were discussed and explored, and also the future research directions were further determined.The results show that the performance assessment of mixture is directly affected by test condition, differences among asphalts and climates should be taken into account when deciding testing temperature, evaluation criterion, and loading times. Considering the effect of gap of cylindrical specimen on mechanical characteristics and selected spotting, corresponding improving measures are proposed. Furthermore the relevant mathematics models of evaluation index make up the defect of undefined existential evaluation indexes, provide guidance for scientific evaluation of performance and also lay the foundation of setting evaluation norms of HWTD.