再生剂对老化沥青流变性能和微观特性的影响
首发时间:2022-12-28
摘要:为研究再生沥青的再生机理,根据北方路面冬季低温服役时间较长、其他季节易发生中温(10~40 ℃)疲劳等特点,基于沥青基本性能试验、动态剪切流变(dynamic shear rheological,DSR)试验和低温弯曲梁流变(low temperature bending beam rheology,BBR)试验,对比分析经过压力老化的基质沥青和SBS改性沥青在不同再生剂掺量下的中低温性能,同时结合傅里叶变换红外光谱(Fourier transform infrared spectrum,FTIR)和原子力显微镜(atomic force microscope,AFM)测试原样、老化和再生沥青官能团变化、微观形貌及力学特性。结果表明:掺加再生剂可以恢复老化沥青基本性能、提高中温抗疲劳性能和低温抗开裂性能;添加再生剂后,基质沥青羰基指数(CI)、亚砜基指数(SI)、芳香族指数(AI)增大,SBS改性沥青CI和SI减小,AI增大,丁二烯指数(BI)变化很小;再生剂通过对老化沥青的组分和官能团含量进行调节来恢复沥青流变学性能;掺入再生剂可以恢复老化沥青微观形貌使单个"蜂型结构"面积减小,且随着再生剂掺量的增加,再生沥青的微观黏附力不断提高,杨氏模量不断下降。
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Effect of regenerant on rheological properties and microscopic characteristics of aging asphalt
Abstract:In order to study the regeneration mechanism of recycled asphalt, according to the characteristics of long low temperature service time of northern pavement in winter and prone to middle temperature (10-40 ℃) fatigue in other seasons, based on the basic performance test of asphalt, dynamic shear rheological test (DSR) and low temperature bending beam rheological test (BBR), the medium-low temperature performance of long-term aging 90# asphalt and SBS modified asphalt with different regenerant contents was compared and analyzed. At the same time, the changes of functional groups, microscopic morphology and mechanical properties of the original sample, aging and recycled asphalt were tested by Fourier transform infrared spectrum (FTIR) and atomic force microscope (AFM). The results show that the addition of regenerant can restore the basic performance of aging asphalt, improve the middle temperature fatigue resistance and low temperature cracking resistance. After adding regenerant, the carbonyl index (CI), sulfoxide index (SI) and aromatic index (AI) of matrix asphalt increase, the CI and SI of SBS modified asphalt decrease, the AI increases, and the butadiene index (BI) changes little. The regenerant can restore the microscopic morphology of aging asphalt to reduce the area of individual "bee-type structures", and as the amount of regenerant increases, the microscopic adhesion of recycled asphalt increases and Young\'s modulus decreases.
Keywords: recycled asphalt regenerant medium-low temperature rheological properties functional groups
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