基于灰熵关联分析法的再生沥青流变特性研究OACSTPCD

To evaluate the changes in chemical composition of modified asphalt before and after regeneration at different aging levels and reveal the regeneration mechanism of modified asphalt,the changes in rheological properties and microscopic components of modified asphalt before and after regeneration with different aging degrees were studied through experimental methods such as Fourier transform infrared spectroscopy(FTIR)and dynamic shear rheological(DSR)testing.The research results indicate that as the degree of aging increases,the complex modulus,phase angle,and creep rate of modified asphalt decrease,while the stiffness modulus increases,the index of the C=O and S=O groups in the FTIR spectrum significantly increases,while the content of the butadiene functional group index decreases.After adding regenerants,the indices of the three functional groups returned to the state near before aging,indicating that the performance of aged asphalt has been regenerated and reshaped to a certain extent.In order to reveal the correlation between the rheological parameters of recycled asphalt and the functional group index,this article uses the grey entropy correlation method to calculate the correlation of various influencing factors.The calculation results are show:the degree of influence of changes in the chemical composition of recycled asphalt on the high-temperature rheological properties parameters is ranked in descending order:carbonyl,sulfoxide,and butadiene;the degree of influence on the low-temperature stiffness modulus,in descending order,is carbonyl,sulfoxide,and butadiene;the degree of influence on low-temperature creep rate,in descending order,is butadiene,sulfoxide group,and carbonyl group.