摘要
为研究再生剂对沥青混合料动态粘弹特性的影响,分别选用重石油基与生物油基两种再生剂制备再生沥青及沥青混合料,并分别在不同掺量下进行沥青三大指标试验以及沥青混合料动态模量试验,根据时温等效原理及改进的Christensen-Anderson-Marasteanu(CAM)模型分析了再生沥青混合料的动态粘弹特性。结果显示,随着再生剂掺量的增加,沥青混合料回收料(RAP)的沥青针入度、延度升高,软化点下降,再生剂的掺入显著提高了沥青的延展性,综合考虑经济与路用性能,以12%(质量分数)作为再生剂最佳掺量并进行混合料动态模量试验。两种再生剂均改变了RAP的感温性与粘弹特性,使再生沥青混合料动态模量降低而相位角升高;改进的CAM模型能够良好拟合再生沥青混合料的动态模量和相位角随频率的发展变化,拟合精度均在0.950以上。两种再生沥青混合料动态模量与相位角大小关系受加载频率影响,当加载频率高于10 Hz后,生物油基再生沥青混合料动态模量更低而相位角更高,当加载频率低于0.01 Hz时则相反,这对于同时提高沥青混合料高温稳定性及低温抗裂性是有利的。
In order to study the influences of regenerants on the dynamic properties of the asphalt mixture,the heavy petroleum-based and bio-oil-based regenerants were selected to prepare the recycled asphalt and the asphalt mixture.Through the penetration,softening point,dyctility tests of the asphalt and the dynamic modulus tests of the asphalt mixture under different regenerant content,the dynamic of the recycled asphalt mixture were analyzed according to the principle of time-temperature equivalence and the improved Christensen-Anderson-Marasteanu(CAM)model.The results show that with the increase of the regenerant content,the penetration and ductility of the asphalt in RAP increase,and the softening point decreases.The incorporation of the regenerant significantly improves the ductility of the asphalt.Taking into account the economy and road performance,12%(mass fraction)is the best content of the regenerant.Both types of regenerants change the temperature sensitivity and viscoelastic properties of RAP,so that the dynamic modulus of the recycled asphalt mixture is reduced and the phase angle increases.The improved CAM mode can fit the dynamic modulus and phase angle of the recycled asphalt mixture with the development of frequency very well,and the fitting accuracy is above 0.950.The dynamic modulus and phase angle of the two recycled asphalt mixtures are affected by the loading frequency.When the loading frequency is higher than 10 Hz,the bio-oil-based recycled asphalt mixture has a lower dynamic modulus and a higher phase angle than the petroleum-based recycled asphalt mixture,while the result is the opposite when the loading frequency is lower than 0.01 Hz,such the dynamic viscoelastic properties are beneficial for improving the high temperature stability and low temperature crack resistance of the asphalt mixture at the same time.
作者
兰建丽
高学凯
孔繁盛
LAN Jianli;GAO Xuekai;KONG Fansheng(Shanxi Provincial Transportation Construction Engineering Quality Inspection Center(Limited),Taiyuan 030006,China;Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan 030006,China;Key Laboratory of Highway Construction and Maintenance Technology of Ministry of Transport in Loess Region,Taiyuan 030006,China)
出处
《硅酸盐通报》
CAS
北大核心
2021年第7期2454-2460,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(51808329)
山西交控科技项目(19-JKKJ-65)。
关键词
再生剂
动态模量
相位角
CAM模型
粘弹特性
regenerant
dynamic modulus
phase angle
CAM model
viscoelastic property
