Almeida Arminda, Sergio Michela
Department of Civil Engineering, University of Coimbra, 3030 Coimbra, Portugal.
CITTA Research Centre for Territory, Transports and Environment, 3030 Coimbra, Portugal.
Materials (Basel). 2019 Apr 19;12(8):1285. doi: 10.3390/ma12081285.
Environmental and health concerns have been increasing in the road construction industry. This industry has provided several techniques and a wide range of additives to lower the production temperatures of asphalt mixtures, generating, among others, a new mix type called warm-mix asphalt (WMA). This paper aims to evaluate the potential of the Sasobit REDUX additive to lower the production temperatures of WMA. This additive, which is an alternative to the well-known Sasobit, is completely soluble in bitumen at temperatures above 85 °C while the same temperature for the Sasobit is 115 °C. For that reason, three target compaction temperatures were considered (90, 100 and 110 °C) and both Marshall and compactability tests were carried out. A hot-mix asphalt (HMA) was tested in parallel for comparison. It was concluded that the volumetric properties (air voids content about 4%) and the Marshall properties (stability about 11 kN, flow about 4 mm and Marshall quotient higher than 2 kN/km) of the Sasobit REDUX-WMA were globally satisfactory. In relation to the compactability test, the Sasobit REDUX-WMA mixtures were relatively easier to be compacted compared to the HMA mixture. The three Sasobit REDUX-WMA mixtures (90, 100 and 110 °C) exhibited a very similar compactability (differences lower than 0.4%). Therefore, it seems reasonable to conclude that the Sasobit REDUX has potential to lower WMA production temperatures by 20 °C. A reduction of that magnitude would lead to significant environmental gains.
道路建设行业中，环境与健康问题日益受到关注。该行业已提供了多种技术及大量添加剂，以降低沥青混合料的生产温度，其中就产生了一种名为温拌沥青（WMA）的新型混合料。本文旨在评估Sasobit REDUX添加剂降低温拌沥青生产温度的潜力。这种添加剂是知名Sasobit的替代品，在高于85℃的温度下可完全溶于沥青，而Sasobit的溶解温度为115℃。因此，考虑了三个目标压实温度（90、100和110℃），并进行了马歇尔试验和压实性能试验。同时测试了热拌沥青（HMA）以作比较。结果表明，Sasobit REDUX - WMA的体积特性（空隙率约4%）和马歇尔性能（稳定度约11kN，流值约4mm，马歇尔商大于2kN/km）总体令人满意。关于压实性能试验，与热拌沥青混合料相比，Sasobit REDUX - WMA混合料相对更容易压实。三种Sasobit REDUX - WMA混合料（90、100和110℃）表现出非常相似的压实性能（差异低于0.4%）。因此，有理由得出结论，Sasobit REDUX有潜力将温拌沥青的生产温度降低20℃。如此幅度的降低将带来显著的环境效益。
