In pavement engineering, the use of warm mix asphalt (WMA) technologies can ensure important environmental and technical benefits. However, several uncertainties about WMA still exist, such as long-term field performance and full compatibility with reclaimed asphalt pavement (RAP) or polymer modified bitumen (PMB). In this regard, a full-scale trial section (including three test fields with warm recycled mixtures prepared with different WMA chemical additives and a reference test field with hot recycled mixtures, all containing PMB) was constructed along an Italian motorway and monitored for several years of service life. The evolution of the structural properties was assessed with in-situ Falling Weight Deflectometer (FWD) tests and laboratory tests on extracted cores, both immediately after the construction of the trial section and after more than three years under actual traffic loading. It was found that the reduced working temperatures adopted for the WMA mixes (40°C lower than hot mix asphalt (HMA)) did not penalise the workability and the stiffness immediately after the trial section construction, whereas the HMA mixture experienced higher structural damage (likely due to more severe aging) during the in-service life. The WMA mixes exhibited better stiffness homogeneity and, overall, superior performance and potentially longer service life with respect to the reference HMA mixture.

在路面工程中，使用暖拌沥青（WMA）技术可以确保重要的环境和技术效益。但是，关于WMA的一些不确定性仍然存在，例如长期的现场性能以及与再生沥青路面（RAP）或聚合物改性沥青（PMB）的完全相容性。在这方面，沿着意大利高速公路建设了一个完整的试验区（包括三个用不同的WMA化学添加剂制备的热循环混合物的试验场和一个均包含PMB的热循环混合物的参考试验场），并进行了几年的监测使用寿命。结构特性的演变通过就地降落挠度计（FWD）测试和提取芯的实验室测试进行了评估，无论是在试验段建成后，还是在实际交通负荷下超过三年之后。结果发现，WMA混合料降低的工作温度（比热混合沥青（HMA）低40°C）不会在试验段施工后立即损害可加工性和刚度，而HMA混合料遭受更高的结构破坏（在使用期间可能是由于更严重的老化）。与参考HMA混合物相比，WMA混合物表现出更好的刚度均匀性，总体上具有优越的性能，并且使用寿命可能更长。结果发现，WMA混合料降低的工作温度（比热混合沥青（HMA）低40°C）不会在试验段施工后立即损害可加工性和刚度，而HMA混合料遭受更高的结构破坏（在使用期间可能是由于更严重的老化）。与参考HMA混合物相比，WMA混合物表现出更好的刚度均匀性，总体上具有优越的性能，并且使用寿命可能更长。结果发现，WMA混合料采用的降低的工作温度（比热混合沥青（HMA）低40°C）不会立即破坏试验段的施工性和刚度，而HMA混合料则遭受了更高的结构破坏（在使用期间可能是由于更严重的老化）。与参考HMA混合物相比，WMA混合物表现出更好的刚度均匀性，总体上具有优越的性能，并且使用寿命可能更长。