微波诱导新旧沥青的融合程度

董淼¹，单景松^2*，张斌¹，丛凯¹，张新正¹，韩威林²

1.山东省公路桥梁建设集团有限公司，山东 济南  250014；

2.山东科技大学土木工程与建筑学院，山东 青岛  266590

摘要：为促进废旧沥青混合料在再生沥青中的高质量分数应用，在新旧沥青混合料中添加纳米材料作为吸波剂提高微波加热效率，依据新旧沥青在荧光显微镜下被激发的荧光强度差异，观察微波诱导下掺加不同吸波剂（单掺纳米SiC、单掺纳米Fe₂O₃、复掺纳米SiC-纳米Fe₂O₃，纳米SiC与纳米Fe₂O₃质量比为1：2）再生沥青混合料试件的新旧沥青的融合程度，采用灰度量化表达沥青的融合程度。结果发现：单掺纳米SiC或单掺纳米Fe₂O₃均能提高再生沥青混合料试件中新旧沥青交界处的灰度，单掺纳米SiC后试件新旧沥青交界处的灰度优于单掺纳米Fe₂O₃，复掺纳米SiC-纳米Fe₂O₃后新旧沥青交界处的灰度比单掺任一种吸波剂更优，复掺纳米SiC-纳米Fe₂O₃后试件新旧沥青交界处的灰度为新沥青的72.14%。

关键词：新旧沥青融合；荧光显微镜；吸波剂；灰度；微波

The fusion degree of new and old asphalt induced by microwave

DONG Miao¹, SHAN Jingsong^2*, ZHANG Bin¹, CONG Kai¹, ZHANG Xinzheng¹, HAN Weilin²

1. Shandong Road and Bridge Construction Group Co., Ltd., Jinan 250014, China;

2. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China

Abstract: To promote the high-quality application of waste asphalt mixtures in recycled asphalt, nano-materials are added to the new and old asphalt mixtures as radar absorbing materials to improve microwave heating efficiency. Based on the difference in fluorescence intensity when the new and old asphalt are excited under a fluorescence microscope, the degree of fusion between the new and old asphalt in recycled asphalt mixture specimens with different absorbent agents (single addition of nano-SiC, single addition of nano-Fe₂O₃, and composite addition of nano-SiC-nano-Fe₂O₃,the mass ratio of nano-SiC to nano-Fe₂O₃ is 1:2) under microwave induction is observed, and the fusion status of the asphalt is quantified using gray level. The research results show that both single addition of nano-SiC and single addition of nano-Fe₂O₃ can improve the gray level at the interface of the new and old asphalt in the recycled asphalt mixture specimens. The gray level at the interface of the new and old asphalt after single addition of nano-SiC is better than that after single addition of nano-Fe2O3. After the composite addition of nano-SiC-nano-Fe₂O₃, the gray level at the interface of the new and old asphalt is superior to that with either absorbent agent alone, with the gray level at the interface of the new and old asphalt in the specimens after the composite addition of nano-SiC-nano-Fe₂O₃ being 72.14% of the new asphalt.

Keywords: new and old asphalt fusion; fluorescence microscopy; radar absorbing material; gray scale; microwave