Capayova Silvia, Cihlarova Denisa, Mondschein Petr
Department of Transportation Engineering, Faculty of Civil Engineering, Slovak University of Technology, 810 05 Bratislava, Slovakia.
Department of Transport Constructions, VSB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic.
Materials (Basel). 2022 Aug 16;15(16):5618. doi: 10.3390/ma15165618.
The properties of asphalt mixtures and the quality of their execution are key factors for their service life and durability in the pavement structure. This research aims to study the effect of deicing chemicals (sodium chloride, NaCl) on asphalt mixtures in laboratory conditions to know the changes in properties when the samples were loaded with a different number of freeze-thaw cycles. The behavior of the standardly used asphalt mixtures and bitumen binders was verified by the exposure to sodium chloride solution (20 g/L NaCl). In the first part of the experiment, penetration, elastic recovery, and softening point tests were performed for paving grade bitumen 50/70 and 70/100, and polymer-modified bitumen PMB 25/55-60. Furthermore, asphalt concrete (AC 11) mixtures with different air voids were subjected to 25, 50, and 75 freeze-thaw cycles to determine the effect on the service life of the pavement structure. Following the Czech standard, CSN 73 6161, and the TP 170 regulation for the design of asphalt pavements, the Marshall test and the stiffness modulus were determined for all asphalt samples. The obtained results show a negative effect of freeze-thaw cycles on the properties of asphalt concrete surface course mixtures and bitumen.
沥青混合料的性能及其施工质量是影响其在路面结构中使用寿命和耐久性的关键因素。本研究旨在在实验室条件下研究除冰化学品（氯化钠，NaCl）对沥青混合料的影响，以了解在不同冻融循环次数下样品性能的变化。通过将标准使用的沥青混合料和沥青结合料暴露于氯化钠溶液（20 g/L NaCl）中来验证其性能。在实验的第一部分，对铺路级沥青50/70和70/100以及聚合物改性沥青PMB 25/55-60进行了针入度、弹性恢复和软化点测试。此外，对具有不同空隙率的沥青混凝土（AC 11）混合料进行了25、50和75次冻融循环，以确定对路面结构使用寿命的影响。按照捷克标准CSN 73 6161以及沥青路面设计的TP 170规定，对所有沥青样品进行了马歇尔试验和劲度模量测定。所得结果表明，冻融循环对沥青混凝土表面层混合料和沥青的性能有负面影响。
