Active-enhanced core-shell microcapsules for self-healing properties of asphalt mortarHe, Liang (Avtor) Dai, Changjiang (Avtor) Meng, Sen (Avtor) Li, Guannan (Avtor) Tao, Mengzhe (Avtor) Bergh, Wim van den (Avtor) Zhukouski, Yahor (Avtor) Ržek, Lidija (Avtor) Gaspar, Laszlo (Avtor) Valentin, Jan (Avtor) Kowalski, Karol J. (Avtor) Du, Rongyao (Avtor) Mladenovic, Goran (Avtor) Mirković, Katarina (Avtor) self-healing microcapsulesasphalt pavementcore-shell structuremulti-healing capabilityMicrocapsule technology actively repairs microcracks in asphalt pavement, extending its service life. This study develops multi-healing core-shell microcapsules consisting of a core (polyurea formaldehyde sub-capsules containing sunflower oil) and a shell (calcium alginate capsule) that provides protection and enables delayed release. Scanning electron microscopy (SEM) results show the microcapsules have evenly distributed chambers with an average diameter of approximately 2 mm. The core content and encapsulation efficiency are measured at 65.38 % and 78.52 %, respectively, while the shell exhibits an average hardness of 0.27 GPa. Thermogravimetric analysis indicates the microcapsules can withstand high temperatures up to 230℃. Through multiple self-healing tests, the study demonstrates that the core-shell microcapsules provide sustainable and repeated repair effects on asphalt, with an optimal dosage of 1.5 wt% in asphalt mortar. The self-healing effect improves with increasing dosage, healing time, and healing temperature. The microcapsules continuously release rejuvenator, repairing cracks and enhancing asphalt performance.Elsevier20252025-05-09 08:17:03Neznano22202UDK: 620.1/.2ISSN pri članku: 1879-0526DOI: 10.1016/j.conbuildmat.2025.141113COBISS_ID: 234472451sl© 2025 Elsevier Ltd