Jandová Vilma, Bucková Martina, Huzlík Jiří, Valentin Jan, Effenberger Karel, Svoboda Josef
Transport Research Centre, Líšeňská 33a, 636 00, Brno, Czech Republic.
Department of Road Structures, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29, Prague 6, Czech Republic.
Environ Sci Pollut Res Int. 2025 Jan;32(5):2455-2466. doi: 10.1007/s11356-024-35875-2. Epub 2025 Jan 10.
The paper deals with an analysis of the amount of 16 polycyclic aromatic hydrocarbons (PAHs (Polycyclic aromatic hydrocarbons-16 defined by US EPA.)) released from reclaimed asphalt mixtures used in base layers of road surfaces and in binder layers in road construction using cold in-place recycling. For the ten samples tested, the sum of 16 PAHs was determined directly for the crushed asphalt mixture and for its 24-h leachate. The crushed asphalt samples were used to make cylindrical asphalt specimens of the cold recycling mixture. The asphalt specimens were prepared to simulate as realistically as possible the use of the mixtures in road reconstructions implementing the cold in-place recycling technology, which should ensure the passivation of PAHs. The asphalt specimens were subjected to a dynamic leaching test under laboratory conditions with regular replacement of the leaching liquid. The results showed that the concentration of PAHs released into the water environment from the test specimens (passivated material) was approximately 40-50% lower than the amount of PAHs released from the asphalt mixtures in the 24-h leaching test. When compared to the input PAH concentrations in the asphalt mixtures (36-1323 mg.kg), on average, only 0.15% of PAHs is released from the passivated material. Dynamic leaching test has shown that the wrapping of the original asphalt mixture with a new binder and its subsequent compaction leads to the preservation of PAHs in the original material at such a level that their total concentrations are reduced by two orders of magnitude.
本文分析了在道路建设中使用冷就地再生技术时，路面基层和粘结层中使用的再生沥青混合料释放的16种多环芳烃（PAHs，由美国环境保护局定义的16种多环芳烃）的量。对于测试的10个样品，直接测定了破碎沥青混合料及其24小时浸出液中16种PAHs的总和。破碎的沥青样品用于制作冷再生混合料的圆柱形沥青试件。制备沥青试件以尽可能逼真地模拟冷就地再生技术在道路重建中混合料的使用情况，该技术应确保PAHs的钝化。在实验室条件下，对沥青试件进行动态浸出试验，并定期更换浸出液。结果表明，从试件（钝化材料）释放到水环境中的PAHs浓度比24小时浸出试验中沥青混合料释放的PAHs量低约40%-50%。与沥青混合料中的输入PAH浓度（36-1323毫克/千克）相比，平均而言，钝化材料仅释放0.15%的PAHs。动态浸出试验表明，用新粘结剂包裹原始沥青混合料并随后压实，可使原始材料中的PAHs保持在其总浓度降低两个数量级的水平。
