再生剂对回收沥青胶浆化学组分及流变特性参数的影响

Effect of Regenerant on Chemical Composition and Rheological Properties of Recycled Asphalt Mortar

目的研究沥青路面回收沥青胶浆再生前后的化学组分及流变特性参数变化规律,为沥青路面再生技术推广提供基础理论与技术支撑.方法采用傅里叶变换红外光谱仪(FTIR)和动态剪切流变仪(DSR)进行温度扫描,测试回收沥青胶浆及不同再生剂掺量再生沥青胶浆的化学组分、流变特性参数.结果随着再生剂掺量的增加,回收沥青胶浆IB脂肪族官能团指数逐渐增大,而I C=O羰基指数和I S=O亚砜基官能团指数逐渐降低;加入再生剂后回收沥青胶浆的复数剪切模量、车辙因子和疲劳因子具有一定程度的降低,而相位角则具有一定程度的增加.结论随着再生剂掺量的增加,回收沥青胶浆化学组分发生变化使得回收沥青胶浆路用性能得到显著改善.

The purpose of this paper is to study the effect of regenerant on the chemical composition and rheological properties of recycled asphalt mortar recovered from asphalt pavement,which provided basic theory and technical support for the promotion of asphalt pavement regeneration technology.The FTIR(Fourier Transform Infrared Spectroscopy)test and temperature sweep of DSR(Dynamic Shear Rheological)test were applied to measure the changes in chemical composition and rheological properties of asphalt mortar with different regenerant dosage.The results show that the IB aliphatic functional group index of the recycled asphalt mortar gradually increased with the increase of the regenerant dosage,while the I C=O carbonyl index and the I S=O sulfoxide-based functional group index decreased gradually.The complex shear modulus,rutting factor and fatigue factor of the asphalt mortar recovered after the addition of the regenerant have a certain degree of reduction,while the phase angle has a certain degree of increase.With the increase of the amount of regenerant,the chemical composition of the recovered asphalt mortar changed,and the road performance of the recycled asphalt mortar was significantly improved.