ABSTRACT

The inert surface of Ground Tire Rubber (GTR) particles results in its weak compatibility with asphalt matrix and thus causes serious phase separation in rubberised asphalt. Meanwhile, plasma treatment is able to modify the polymer surface effectively. This study applied cold plasma to modify the surface of GTR particles for compatibility improvement in rubberised asphalt. The surface characteristics of plasma-treated GTR particles with varying treatment power and time were investigated, by means of water contact angle metre, X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope (SEM), respectively. The results reported the enhanced surface hydrophilicity, lipophilicity, and roughness as well as the incorporation of oxygen-containing functional groups of GTR particles after plasma treatment. The optimal processing parameters were determined as the discharge power of 250 W and the processing time of 8 min. The GTR-asphalt compability after the most effective plasma treatment was evaluated by measuring the storage stability and rotational viscosity of rubberised binder. Regardless of base asphalt source, GTR particle size and dosage, cold plasma treatment truly enhanced the compatibility. Furthermore, the increased dosage from 10% to 20% and the decreased size from 30 to 80 mesh generally had a growing positive effect on compatibility.

摘要

轮胎橡胶 (GTR) 颗粒的惰性表面导致其与沥青基体的相容性较弱，从而导致橡胶沥青中的严重相分离。同时，等离子体处理能够有效地对聚合物表面进行改性。本研究应用冷等离子体对 GTR 颗粒表面进行改性，以提高橡胶沥青的相容性。分别通过水接触角仪、X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 研究了等离子处理的 GTR 颗粒在不同处理功率和时间下的表面特性。结果报告了在等离子体处理后增强的表面亲水性、亲油性和粗糙度以及 GTR 颗粒的含氧官能团的结合。最佳工艺参数确定为放电功率为 250 W，处理时间为 8 min。通过测量橡胶粘合剂的储存稳定性和旋转粘度来评估最有效等离子处理后的 GTR-沥青相容性。无论基层沥青来源、GTR粒度和用量如何，冷等离子体处理真正增强了相容性。此外，从 10% 增加到 20% 的剂量和从 30 目减少到 80 目的尺寸通常对相容性产生越来越大的积极影响。冷等离子处理真正增强了兼容性。此外，从 10% 增加到 20% 的剂量和从 30 目减少到 80 目的尺寸通常对相容性产生越来越大的积极影响。冷等离子处理真正增强了兼容性。此外，从 10% 增加到 20% 的剂量和从 30 目减少到 80 目的尺寸通常对相容性产生越来越大的积极影响。