Abstract: The modified Flory-Huggins formula was adopted to calculate the free energy in mixing old asphalt with rejuvenator, and discussed their phase behavior. The solubility parameters and ratio of aromatic carbon of three aged asphalts are more than that of their materials. The mixing free energy of Caltex aged asphalt and rejuvenator R1 is above 0.0 (ΔGM＞0) at 25 ℃, their process of mixing is not spontaneity, so their mixing can’t form the homogeneous phase system. The mixing free energies of R2, R3, composite rejuvenator and aged asphalt are all below 0.0 (ΔGM＜0) at 25 ℃, their processes of mixing are spontaneity, so their mixing can form the homogeneous phase system.

Key words: Solubility parameter , Free energy of mixing , Aged asphalt , Rejuvenator

摘要： 采用修正的Flory-Huggins方程计算老化沥青和再生剂的混合自由能并探讨它们之间的相行为。3
种老化沥青的溶解度参数值和芳碳率均比相应的原料沥青高。再生剂R1 与加德士老化沥青在25 ℃时的混合自由
能ΔGM >0,再生剂R1 与加德士老化沥青的混合过程为非自发过程,因此它们之间不能形成均相体系。3种老化沥
青与R2、R3 和复合再生剂在25℃的混合自由能ΔGM <0,混合过程为自发过程,因此老化沥青与R2、R3 和复合再
生剂能形成均相体系。

关键词: 溶解度参数 , 混合自由能 , 老化沥青 , 再生剂