Impact of temperature on short- and long-term aging of asphalt binders

RILEM Technical Letters

article

Lily D. Poulikakos¹  Bernhard Hofko²  Laurent Porot³  Xiaohu Lu⁴  Hartmut Fischer⁵  Nicole Kringos⁶ 

[1] Empa, Swiss Federal Laboratories for Materials Science and Technology;Vienna University of Technology;Arizona Chemical;Nynas AB;TNO Technical Sciences;Royal Institute of Technology

关键词: Bitumen;    Aging;    Rheology;    FTIR;    Microstructure;   

DOI  :  10.21809/rilemtechlett.2016.4

学科分类：社会科学、人文和艺术（综合）

来源: RILEM Publications SARL

【 摘 要 】

Properties of asphalt concrete after aging are important parameters in determining the long-term performance of these materials. With the popularity of reduced temperature mixtures the question remains how this reduced temperature in short-term aging affects the long-term properties. This paper focuses on developing a robust and fundamental understanding of the effect of temperature on aging by connecting the chemistry of bitumen to its mechanics. To this end, round robin experiments are being currently conducted within 8 laboratories using four binders of the same grade 70/100 pen from different crude sources. In developing chemo-mechanical characterization techniques at the nano- and micro-scale, the material’s variability from crude-source to crude-source and its sensitivity to temperature needs to be taken into consideration. Furthermore, the development of uniform specimen preparation procedures for these bituminous materials at the nano- and micro-structural level is the focus. The chemical characterization is performed using Fourier transform infrared spectroscopy (FTIR). For the mechanical characterization rheological data is used using the dynamic shear rheometer (DSR) as well as conventional tests, e.g. needle penetration and softening point using the ring and ball method. It is shown that the short-term aging temperature affects the increase in softening point, while the consequent effect on long term aging is less pronounced.

【 授权许可】

CC BY