Kim Kyung-Nam, Kim Yeong-Min, Le Tri Ho Minh
Korea Expressway Corporation Research Institute Pavement Research Division, Dongtansunhwan-daero 17-gil, Hwaseong-si 18489, Gyeonggi-do, Republic of Korea.
Department of Highway & Transportation Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Republic of Korea.
Polymers (Basel). 2023 Oct 29;15(21):4256. doi: 10.3390/polym15214256.
Rising traffic volume, heavy loads, and construction activities have raised concerns about expansion joint device damage. This study focuses on developing an innovative expansion joint using polymer-modified rubber asphalt as the filling material to enhance its service life. Styrene-butadiene-styrene (SBS) emerged as a suitable modifier for rubber-modified asphalt, significantly improving elasticity and adhesion. Through the strategic combination of 3- and 2-block linear SBS, the elasticity and adhesion properties were significantly improved, resulting in the formulation of a well-suited polymer-modified rubber asphalt binder. The developed asphalt binder exhibits impressive elastic recovery (61.1% to 66.1%), surpassing commercial products, with enhanced constructability and workability (15% to 21% viscosity reduction). The carefully engineered mastic asphalt mixture showcases self-leveling characteristics at a moderate 210 °C, addressing historical constructability challenges. Settlement is 40% less than traditional hot mix asphalt for surface layers, with improved moisture and stripping resistance, enhancing existing asphalt plug joint durability and workability. Collectively, this novel mixture, comprising polymer-modified rubber and mastic asphalt, showcases the potential to enhance the durability of existing asphalt plug joints while ensuring superior constructability and workability.
交通流量增加、重载以及施工活动引发了对伸缩缝装置损坏的担忧。本研究专注于开发一种创新型伸缩缝，使用聚合物改性橡胶沥青作为填充材料以延长其使用寿命。苯乙烯-丁二烯-苯乙烯（SBS）成为橡胶改性沥青的合适改性剂，显著提高了弹性和粘附性。通过3-嵌段和2-嵌段线性SBS的策略性组合，弹性和粘附性能得到显著改善，从而配制出一种非常合适的聚合物改性橡胶沥青结合料。所开发的沥青结合料表现出令人印象深刻的弹性恢复率（61.1%至66.1%），超过商业产品，同时具有增强的可施工性和工作性（粘度降低15%至21%）。精心设计的玛蹄脂沥青混合料在210℃的适中温度下展现出自流平特性，解决了以往的可施工性挑战。对于表面层，沉降比传统热拌沥青减少40%，同时具有更好的抗水和抗剥落性能，提高了现有沥青嵌缝的耐久性和工作性。总体而言，这种由聚合物改性橡胶和玛蹄脂沥青组成的新型混合料展示了增强现有沥青嵌缝耐久性的潜力，同时确保了卓越的可施工性和工作性。
