湖南大学学报（自然科学版）2019，Vol.46Issue(1)：117-123,7.DOI:10.16339/j.cnki.hdxbzkb.2019.01.013
不同热氧老化强度对沥青及其再生性能的影响
Effects of Thermal Oxidative Aging Intensity on Asphalt and Its Recycling Properties
摘要
Abstract
To explore the effect of thermal oxidative aging intensity on the properties of asphalt, different times of the rotating thin film oven test (RTFOT) and RTFOT + pressure aging vessel (PAV) aging tests were applied to as-phalt. The conventional physical properties and dynamic shear rheological properties of asphalt samples were tested before and after aging. Additionally, the viscosity harmonic method was used to determine the amount of rejuvenating agent in order to restore the asphalt performance under different thermal oxidative aging to the matrix asphalt. The test results show that the physical properties of asphalt are significantly changed after different thermal oxidative ag-ing intensity. The dynamic shear rheological test results exhibit that the increase ratio of asphalt complex modulus (G*) decreases obviously after the certain aging degree, and finally, the G* approaches a stable value. It is found through physical and rheological properties that, for Changlian 70# asphalt, 3 times RTFOT aging intensity is equal to the RTFOT + PAV aging intensity. In addition, through viscosity harmonic method selecting rejuvenating agent dosage, it can be found that the recycling asphalt′s G* can restore to the level of matrix asphalt, the penetration is slightly lower than the matrix asphalt, but the ductility is improved obviously. Additionally, the softening point is higher than that of matrix asphalt. At the same time, the phase angle (δ) at low temperature can be restored to the level of matrix asphalt, but it cannot be restored to the level of the matrix asphalt at high temperature.关键词
道路工程/沥青/热氧老化/再生/黏度调和法/流变性能Key words
road engineering/asphalt/oxidative aging/recycling/viscosity harmonic method/rheological properties分类
交通工程引用本文复制引用
张恒龙,赵彬,徐国庆,朱崇政,吴超凡..不同热氧老化强度对沥青及其再生性能的影响[J].湖南大学学报（自然科学版）,2019,46(1):117-123,7.基金项目
国家自然科学基金资助项目(51678232) （51678232）
湖南省自然科学基金资助项目(2017JJ3015) （2017JJ3015）
湖南省交通科技进步与创新计划项目(201805) （201805）
长沙市科技计划项目(KC1703038,KQ1706018) （KC1703038,KQ1706018）
