ABSTRACT

An interlaboratory study was conducted among 20 European road asphalt laboratories, to screen current test protocols for testing low temperature properties of asphalt binders using a Dynamic Shear Rheometer (DSR) with 4 mm diameter parallel plate geometry. From the comparison of the test protocols for conducting temperature-frequency sweep tests between −30°C and 0°C, and between 0.1 and 10 Hz respectively, remarkable differences were identified in terms of the specimen preparation, of specimen geometry, of specimen conditioning and of oscillation amplitudes. Results of complex shear modulus and phase angle demonstrate good repeatability and general applicability of the 4 mm geometry. However, significant deviations were obtained between different participants, implicating the need for standardisation. For an extended repeatability and reproducibility analysis, and to obtain a sound basis for the revision of the corresponding European Standard EN 14770, a follow-up interlaboratory study was recently started based on this study, prescribing a detailed test protocol.

摘要

在 20 个欧洲道路沥青实验室之间进行了一项实验室间研究，以筛选当前使用具有 4 mm 直径平行板几何形状的动态剪切流变仪 (DSR) 测试沥青粘合剂低温性能的测试协议。通过比较分别在 -30°C 和 0°C 之间以及 0.1 和 10 Hz 之间进行温度频率扫描测试的测试协议，发现在试样制备、试样几何形状、试样调节方面存在显着差异和振荡幅度。复杂剪切模量和相位角的结果表明 4 mm 几何结构具有良好的可重复性和普遍适用性。然而，不同参与者之间存在显着差异，这意味着需要标准化。