Towards Green Pavements with Novel Class of SBS Polymers for Enhanced Effectiveness in Bitumen and Pavement Performance

Erik J. Scholten ； Willem Vonk ； Jan Korenstra

《International Journal of Pavement Research and Technology》 3卷4期 (2010/07) Pp. 216-222

https://doi.org/10.6135/ijprt.org.tw/2010.3(4).216

並列摘要

The performance of a base course in a pavement construction can be improved substantially by modification at relatively high level with polymers of the styrene butadiene styrene (SBS) type. As base courses are generally produced with relatively hard binders, a new polymer had to be developed as standard SBS at high concentrations in hard bitumen is likely to lead to poor processing and compatibility. The new polymer design is based on an increased vinyl content of the poly-butadiene mid-block, which has the advantage of being smaller in size at the same molecular weight (lower viscosity hence easier processing) and enhanced reactivity facilitating compatibility. One of the perceived positive contributions of SBS modification is its ability to form reaction products with bitumen molecules (grafting) and a method had to be developed to demonstrate such reactions to take place. The new polymer structure, the development of the method to proof grafting reactions taking place, the testing of the new polymer in base course binders and asphalt mixes, and finally the finite element modeling based on the fundamental material characteristics are presented. These demonstrate that as a result of the significantly improved performance, the overall pavement thickness design can be reduced by as much as 40% thus gaining environmental and economical benefits.

並列關鍵字

Fatigue ； Finite element modelling ； Pavement design ； Polymer modified bitumen ； SBS