Złotowska Magdalena, Nagórski Roman, Błażejowski Krzysztof
Institute of Roads and Bridges, Faculty of Civil Engineering, Warsaw University of Technology, al. Armii Ludowej 16, 00-637 Warsaw, Poland.
ORLEN Asfalt sp. z o.o., ul. Chemików 7, 09-411 Płock, Poland.
Materials (Basel). 2021 Jan 20;14(3):480. doi: 10.3390/ma14030480.
Since 2009, SBS (styrene-butadiene-styrene) polymer-modified binders (HiMA-Highly Modified Asphalt) have been tested worldwide. Highly modified binders are characterized by extraordinary properties resulting from the reversal of the binder-polymer phase. This contributes to very good test results for asphalt mixes. The use of such a modern binder poses a challenge in terms of structure design, mainly due to the lack of a recognized and calibrated method suitable for this material. The article proposes a new approach to pavement fatigue life estimation-the Similarity Method-which is based on the use of AASHTO 2004 equations and laboratory fatigue testing results of asphalt concrete mixes for asphalt base course. The article presents the method and the results of its sensitivity testing with respect to the influence of the material (type of asphalt concrete), thickness of the asphalt base course, stiffness of the subgrade and the assumed index (the area of bottom-up cracks). The results of fatigue life according to the Similarity Method are within the range of values obtained for AASHTO 2004 and the fatigue results according to the equations obtained in the laboratory. This approach will enable inclusion of new materials, such as HiMA asphalt mixtures, in pavement structure design.
自2009年以来，SBS（苯乙烯-丁二烯-苯乙烯）聚合物改性粘结料（HiMA-高改性沥青）已在全球范围内进行了测试。高改性粘结料具有因粘结料-聚合物相逆转而产生的非凡性能。这有助于沥青混合料获得非常好的测试结果。使用这种现代粘结料在结构设计方面带来了挑战，主要是因为缺乏适用于这种材料的公认且经过校准的方法。本文提出了一种新的路面疲劳寿命估算方法——相似性方法，该方法基于使用AASHTO 2004方程以及沥青基层沥青混凝土混合料的实验室疲劳测试结果。本文介绍了该方法及其针对材料（沥青混凝土类型）、沥青基层厚度、路基刚度和假定指标（自下而上裂缝面积）影响的敏感性测试结果。根据相似性方法得出的疲劳寿命结果在AASHTO 2004获得的值以及根据实验室得出的方程得到的疲劳结果范围内。这种方法将能够把诸如HiMA沥青混合料等新材料纳入路面结构设计中。
