Nanomaterials are increasingly being used in road engineering with the development of road construction technology. The smoke suppression performance of asphalt can be substantially improved using organic nano-montmorillonite (OMMT)/styrene–butadiene–styrene (SBS) block modifiers. Pyrolysis gas chromatography–mass spectrometry (PY-GC–MS), fluorescence microscopy (FM), thermogravimetric analysis (TG), and gel permeation chromatography (GPC) were used to explore the characteristics and microscopic mechanisms of flue gas emissions. The addition of OMMT effectively reduced the emissions of carbon dioxide and Volatile Organic Compounds (VOCs) in asphalt flue gas, as well as increased the SBS swelling degree in the asphalt matrix and the compatibility between the SBS and asphalt matrix. The stable interlayer structure formed via OMMT/SBS co-modification effectively inhibited the release of VOCs during the thermal decomposition of asphalt, being more environmentally friendly because of the reduction in emissions compared with traditional asphalt. The SBS, OMMT, and asphalt matrix is a physically modified mixture. The incorporation of OMMT increases the macromolecule content in the modified asphalt, showing that OMMT inhibited the decomposition of asphalt macromolecules into smaller molecules, thus reducing the release of VOCs. Including the appropriate macro and small molecules helps strengthen the ability of asphalt to resist permanent deformation at high temperatures, maintain its flexibility, and effectively prevent cracking at low temperatures.

中文翻译：

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OMMT/SBS改性沥青烟气排放特征及微观机理


随着道路建设技术的发展，纳米材料越来越多地用于道路工程。使用有机纳米蒙脱石 （OMMT）/苯乙烯-丁二烯-苯乙烯 （SBS） 嵌段改性剂可以显著提高沥青的抑烟性能。采用热解气相色谱-质谱 （PY-GC-MS）、荧光显微镜 （FM）、热重分析 （TG） 和凝胶渗透色谱 （GPC） 探讨烟气排放的特点和微观机制。OMMT 的添加有效减少了沥青烟气中二氧化碳和挥发性有机化合物 （VOC） 的排放，并提高了沥青基体中 SBS 的膨胀程度以及 SBS 与沥青基体之间的相容性。通过 OMMT/SBS 共改性形成的稳定夹层结构有效抑制了沥青热分解过程中 VOCs 的释放，与传统沥青相比，排放量减少，更加环保。SBS、OMMT 和沥青基体是一种物理改性的混合物。OMMT 的掺入增加了改性沥青中的大分子含量，表明 OMMT 抑制了沥青大分子分解成更小的分子，从而减少了 VOCs 的释放。包括适当的大分子和小分子有助于增强沥青在高温下抵抗永久变形的能力，保持其柔韧性，并有效防止低温下开裂。