Effects of thermal-oxidative aging on rheological properties of montmorillonite modified bitumen
Organic montmorillonite (OMMT) modified bitumen nanocomposites was prepared by melt blending. The effects of thin-film oven test(TFOT) and pressure ageing vessel(PAV) on rheological properties of pristine bitumen and OMMT modified bitumen were investigated by dynamic shear rheometer (DSR). The results show that complex modulus (G*) increases, phase angle (δ) decreases and rutting factor (G*/sin δ) is enhanced for the pristine bitumen after TFOT, whereas G*, δ and G*/sin δ of OMMT modified bitumen have a little change before and aider TFOT. Besides, the pristine bitumen exhibits a large increase of G* and a great decrease of δ after PAV aging. However, the changes in G* and δ of OMMT modified bitumen are small before and after PAV.Compared with the pristine bitumen, OMMT modified bitumen presents a lower fatigue factor (G*sin δ) after PAV. As a consequence,resistance to thermal-oxidative aging of bitumen is remarkably improved due to the introduction of OMMT.
montmorillonite bitumen aging rheologieal property
FENG Peng-cheng(冯鹏程) YU Jian-ying(余剑英) WANG Xiao(王骁) TAO Yuan-yuan(陶园园)
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
国际会议
长沙
英文
167-171
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）