摘要
再生沥青混合料制备过程中,一部分老化沥青先从回收料表面转移到新集料上,然后再与新沥青进行相互扩散、融合,其中老化沥青转移的比例对最终的再生效果起关键影响作用。为了研究沥青路面回收料(RAP)中老化沥青的转移程度,基于红外光谱试验对转移率(R_(MR))进行计算分析。试验采用AC-13级配的再生沥青混合料,将拌和后的再生沥青混合料过筛分离出新集料和RAP,抽提出再生沥青并采用红外光谱试验测定其羰基指数(I_(CI)),根据公式计算转移率,研究RAP加热温度、拌和时间和再生剂对转移率的影响。结果表明:将RAP加热温度从135℃提升至160℃,转移率提高了15.5%;将拌和时间从90 s延长至180 s,转移率可提升17%;添加再生剂可使转移率得到提升,且温拌再生剂的效果优于热拌再生剂。
During the preparation of the recycled asphalt mixture,part of the aged asphalt is first transferred from the surface of the recycled material to the new aggregate and then diffused and fused with the new asphalt,in which the percentage of transferred aged asphalt plays a key role in the final regeneration effect.In order to study the degree of transfer of aged asphalt in reclaimed asphalt pavement(RAP),the mobilization rate(R_(MR))was calculated and analyzed based on the Fourier transform infrared spectroscopy(FTIR).The AC-13 graded recycled asphalt mixture was mixed and sieved to separate the new aggregate and RAP.The recycled asphalt was extracted,and its carboxyl index(I_(CI))was determined by FTIR.The R_(MR)was calculated according to the equation.In addition,the influences of RAP temperature,mixing time,and regenerants on the R_(MR)were evaluated.The test results show that the R_(MR)can be increased by 15.5%when the RAP temperature is raised from 135℃ to 160℃.When the mixing time is extended from 90 s to 180 s,the R_(MR)can be increased by 17%.The addition of regenerants can improve the R_(MR),and the effect of regenerants for warm mix is better than regenerant for hot mix.
作者
邹晓勇
李宁
吴闻秀
王鑫
徐晓和
ZOU Xiaoyong;LI Ning;WU Wenxiu;WANG Xin;XU Xiaohe(Jinhua Highway and Transportation Management Center,Jinhua,Zhejiang 321000,China;College of Civil and Transportation Engineering,Hohai University,Nanjing,Jiangsu 210098,China)
出处
《中外公路》
2024年第1期88-94,共7页
Journal of China & Foreign Highway
基金
浙江省交通运输厅科技计划项目(编号:2021043)
中央高校基本科研业务费专项资金资助项目(编号:B210202050)。
