己二酸二辛酯(DOA)改性沥青老化行为的化学-流变关联分析

Chemo-rheological correlation analysis of aging behavior in Dioctyl Adipate (DOA) modified bitumen

摘要

为探究己二酸二辛酯(DOA)改性沥青在老化过程中化学组分与流变特性的演化规律及内在关联,通过室内外老化试验,结合傅里叶变换红外光谱、频率扫描试验及2S2P1D、CAM模型,得到不同DOA掺量下沥青老化过程中亚砜基指数、酯基指数及复数模量、相位角主曲线积分面积的演化规律,并选用灰色关联度和皮尔逊相关系数评估沥青特征官能团指数与模型参数的关联程度。结果表明:室内老化条件下,随着DOA掺量的增加(0%~4%),亚砜基指数增长率从334.2%升至628.2%,酯基指数变化率由53.7%降至-4.4%,且当DOA掺量为3%时,沥青复数模量和相位角主曲线积分面积变化幅度最小。自然老化条件下,随着DOA掺量的增加(0%~4%),亚砜基指数增长率从119.0%升至163.9%,酯基指数变化率从-21.2%增至2.3%;当DOA掺量为2%时,沥青复数模量和相位角主曲线积分面积变化幅度最小。此外,基于灰色关联度和皮尔逊相关系数法,沥青在老化过程中部分特征官能团指数与模型参数呈现显著关联特征。

Abstract

To investigate the evolution of chemical components and rheological properties of dioctyl adipate (DOA)-modified bitumen during aging and their inherent correlations, this study conducted both indoor and outdoor aging tests, combined with Fourier-transform infrared spectroscopy (FTIR), frequency sweep tests, and the 2S2P1D and CAM models. The evolution of sulfonic group index, ester group index, complex modulus, and phase angle master curve integral area for bitumen with different DOA contents during aging was systematically analyzed. Additionally, the correlation between bitumen’s functional group indices and rheological model parameters was evaluated using gray relational analysis and Pearson correlation coefficient methods. The results indicate that under indoor aging conditions, as the DOA content increased from 0% to 4%, the growth rate of the sulfonic group index increased from 334.2% to 628.2%, while the change rate of the ester group index decreased from 53.7% to -4.4%. When the DOA content was 3%, the variation of the complex modulus and phase angle master curve integral area was minimal. Under natural aging conditions, as the DOA content increased from 0% to 4%, the growth rate of the sulfonic group index increased from 119.0% to 163.9%, while the change rate of the ester group index increased from -21.2% to 2.3%. When the DOA content was 2%, the variation of the complex modulus and phase angle master curve integral area was minimal. Furthermore, based on the gray relational analysis and Pearson correlation coefficient method, a significant correlation between certain functional group indices and rheological model parameters of bitumen during aging was clearly observed.

关键词

DOA改性沥青 / 老化 / 流变特性 / 官能团指数 / 灰色关联度 / 皮尔逊相关系数

Key words

DOA-modified bitumen / aging / rheological properties / functional group indices / grey relational degree / pearson correlation coefficient

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基金资助

国家自然科学基金项目(51768062)