In this paper, microscopic technique tests were carried out to observe and evaluate the degree of blending between reclaimed asphalt pavement (RAP) binder and virgin binder in hot mixed asphalt mixture. To this end, titanium dioxide (TiO2) was selected as a tracer to tag virgin binder. Scanning electron microscope/energy dispersive spectrometer (SEM/EDS) experiments were conducted on compacted recycled asphalt mixtures and virgin asphalt mixtures. The element mass ratio of titanium over sulfur (Ti:S) was proposed as an quantitative indicator of blending ratio to accurately evaluate the degree of partial blending between RAP and virgin binders. The SEM/EDS images visually displayed the partial blending in high RAP mixtures. Different partial blending patterns were observed under different handling processes. The results of EDS tests indicated that with the increase of the RAP content, the blending degree of virgin and aged binder decreased rapidly, and the homogeneity of blended binder became weakened. In addition, aging process and recycling agent could improve the efficiency of RAP binder as it is blended with virgin one, and it should be noted that the inter-diffusion of old and new binders need enough time. This methodology provides a systemic approach to determine the degree of binder blending in RAP mixture.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Laboratory Observation and Evaluation of Asphalt Blends of Reclaimed Asphalt Pavement Binder with Virgin Binder using SEM/EDS


    Additional title:

    Transportation Research Record


    Contributors:
    Jiang, Yanxu (author) / Gu, Xingyu (author) / Zhou, Zhou (author) / Ni, Fujian (author) / Dong, Qiao (author)


    Publication date :

    2018-07-07




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Asphalt and binder evaluation of asphalt mix with 70% reclaimed asphalt

    Porot, L. / Broere, D. / Wistuba, M. et al. | British Library Online Contents | 2017


    Laboratory Study on Effects of High Reclaimed Asphalt Pavement and Binder Content

    Boriack, Paul / Katicha, Samer W. / Flintsch, Gerardo W. | Transportation Research Record | 2014


    A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

    Kaseer, Fawaz / Arámbula-Mercado, Edith / Martin, Amy Epps | Transportation Research Record | 2019


    Cracking performance characterisation of asphalt mixtures containing reclaimed asphalt pavement with hybrid binder

    Yan, Yu / Roque, Reynaldo / Hernando, David et al. | British Library Online Contents | 2019