摘要
为了研究不同再生剂掺量下再生沥青胶浆的再生效果、特征官能团和细观力学参数的演变及其对高温流变特性的影响,采用动态剪切流变试验(DSR)和傅里叶变换红外光谱(FTIR)技术,分别测试了KL90基质沥青及其压力老化(PAV)沥青、回收沥青胶浆、再生剂掺量为6%、9%、12%的再生沥青胶浆的特流变特性和征官能团,同时采用规划求解的方法得到了沥青胶浆细观力学参数,并对沥青胶浆的宏观流变特性参数与细观力学参数的关系进行了公式推导。结果表明,温度对沥青胶浆的流变特性有重要影响,再生剂的加入使得沥青胶浆的流变特性得到恢复,同时也降低其抗车辙能力,当再生剂掺量为9%时,回收沥青胶浆的高温流变特性恢复较好;相比KL90基质沥青,PAV老化沥青和回收沥青胶浆羰基指数(CI)增加;回收沥青胶浆在1260 cm-1处、1018 cm-1和1089 cm-1处出现了C-O-C键和Si-O-Si键的特征峰,再生沥青胶浆在1744 cm-1处和1160 cm-1处出现了饱和脂肪酸酯C=O键和直链C-C键的特征峰;回收沥青胶浆的细观力学参数E1、η1、E2、η2显著高于KL90基质沥青及再生沥青胶浆,随着再生剂掺量增加,E1、η1、E2、η2逐渐减小。
Dynamic shear rheology test(DSR)and Fourier transform infrared spectroscopy(FTIR)techniques were used to investigate the regeneration effect of regenerated asphalt mortar and the evolution of characteristic functional groups and nanoscopic morphology under different rejuvenator dosages,as well as their influence on high temperature rheological properties.The rheological property parameters,characteristic functional groups and nanoscopic morphology of KL90 base asphalt and its pressure aging(PAV)asphalt,reclaimed asphalt mortar and regenerated asphalt mortar with rejuvenator dosage of 6%,9%and 12%were tested in this paper.At the same time,the meso-mechanical parameters of the asphalt mortar were obtained by the method of programming and the relationship between the macro-rheological parameters and the meso-mechanical parameters of the asphalt mortar was derived.The results show that temperature had an important influence on the rheological properties of asphalt mortar.The addition of rejuvenator restored the rheological properties of asphalt mortar and reduced its resistance to rutting.When the dosage of rejuvenator was 9%,the high temperature rheological properties of the recovered asphalt mortar recovered better.The carbonyl index(CI)and sulfoxide index(SI)of PAV aged asphalt and reclaimed asphalt mortar increased compared with KL90 base asphalt.The reclaimed asphalt mortar exhibited characteristic peaks of C-O-C at 1260/cm and Si-O-Si at 1018/cm and 1089/cm.The regenerated asphalt mortar exhibited characteristic peaks of saturated fatty acid ester(C=O)and linear C-C bond at 1744/cm and 1160/cm.The meso-mechanical parameters E1、η1、E2、η2 of the reclaimed asphalt mortar were significantly higher than those of KL90 base asphalt and regenerated asphalt mortar.As the amount of the regenerant increased,E1、η1、E2、η2 gradually decreased.
作者
李萍
康筱
念腾飞
林梅
LI Ping;KANG Xiao;NIAN Tengfei;LIN Mei(School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第6期6206-6214,共9页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51868047,51668041)。
关键词
红外光谱
原子力显微镜
回收沥青胶浆
流变特性
特征官能团
细观力学参数
infrared spectroscopy
atomic force microscopy
reclaimed asphalt mortar
rheological properties
characteristic functional group
meso-mechanical parameters
