掺煤气化渣沥青混合料微波诱导自愈合性能研究  

Microwave-Induced Self-Healing Performance of Asphalt Mixtures with Coal Gasification Slag

作　　者：丁冬海 吴星星 肖国庆[1] 关博文[2] 靳恩东 DING Donghai;WU Xingxing;XIAO Guoqing;GUAN Bowen;JIN Endong(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Materials Science and Engineering,Chang an University,Xi'an 710064,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]长安大学材料科学与工程学院,西安710064

出　　处：《硅酸盐通报》2024年第11期4185-4194,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52168062);陕西省重点研发计划(2023-YBGY-494)。

摘　　要：沥青混合料具有一定的微波诱导自愈合性能,但自愈合过程较为缓慢,可加入吸波填料以增强沥青混合料的微波吸收能力,进而加快自愈合过程。以煤气化渣为吸波填料制备沥青混合料,研究了掺煤气化渣沥青混合料的微波诱导自愈合性能及机理。结果表明:煤气化渣替代量为50%和100%(质量分数)的沥青混合料的微波升温速率分别较普通沥青混合料提高了23.1%和53.8%;煤气化渣可显著提升沥青混合料的介电性能,在微波辐射下,煤气化渣可将更多的电磁能转化为热能,进而诱导沥青混合料自愈合过程的发生;掺煤气化渣沥青混合料的自愈合性能明显优于普通沥青混合料,经过90 s的微波加热,煤气化渣替代量为50%和100%的沥青混合料的自愈合效率分别是普通沥青混合料的2.59倍和3.36倍;煤气化渣的加入也可显著改善沥青混合料愈合后的损伤程度,从而使沥青混合料具有更优异的自愈合性能。Asphalt mixtures have certain microwave-induced self-healing performance,but the self-healing process is relatively slow.Wave-absorbing fillers can be added to enhance the microwave absorption capacity of asphalt mixtures,thereby accelerating the self-healing process.In this paper,coal gasification slag was used as a wave-absorbing filler to prepare asphalt mixtures.The microwave-induced self-healing performance and mechanism of asphalt mixtures with coal gasification slag were investigated.The results show that the microwave heating rate of asphalt mixtures with 50%and 100%(mass fraction)replacement of coal gasification slag increases by 23.1%and 53.8%,respectively,compared with that of ordinary asphalt mixture.Coal gasification slag can significantly improve the dielectric properties of asphalt mixtures.Under microwave radiation,coal gasification slag can convert more electromagnetic energy into thermal energy,which in turn induces the occurrence of self-healing process in asphalt mixtures.The self-healing performance of asphalt mixtures with coal gasification slag is significantly better than that of ordinary asphalt mixtures.After 90 s of microwave heating,the self-healing efficiency of asphalt mixtures with 50%and 100%replacement of coal gasification slag is 2.59 times and 3.36 times higher than that of ordinary asphalt mixtures,respectively.The addition of coal gasification slag also significantly improves the damage level of asphalt mixtures after healing,resulting in superior self-healing performance.

关 键 词：沥青混合料 自愈合性能 煤气化渣 微波诱导 吸波填料 介电性能 

分 类 号：U414[交通运输工程—道路与铁道工程]