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    Volume 50, Issue 2 (August 2021)

    Special Issue Paper

    The Impact of the RAP Cluster Dissociation on Gradation and Shape Properties of Aggregates from Recycled Asphalt Mixtures

    (Received 5 March 2021; accepted 16 June 2021)

    Published Online: 18 August 2021

    CODEN: JTEVAB

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    Abstract

    The presence of clusters in reclaimed asphalt pavement (RAP) is a critical point that affects the RAP homogeneity. In this phenomenon, different RAP particles are working together as a single aggregate. The cluster dissociation occurs during hot asphalt mixture production and compaction in the field. This research is concerned with the impact of the cluster disintegration on the recycled asphalt mixture aggregate properties. Stages of binder extraction were performed in six RAP materials to partially activate the RAP binder and create different levels of cluster dissociation from 0 to 100 %. Then, the gradation curve and the aggregate shape properties were obtained for each level. Using a gradation curve (without RAP) as a reference, a hypothetical recycled asphalt mixture was created with different RAP percentages to investigate the impact of cluster dissociation on the aggregate properties of the recycled mixture. The results indicate that the RAP aggregate properties are significantly affected by the cluster dissociation. Besides, there was a significant impact on the partial cluster dissociation, because of RAP-binder activation, on the gradation curve and aggregate shape of the recycled mixture, mainly when the level of RAP-binder activated is between 40 and 70 %.

    Author Information:

    Ferreira, W. L. G.
    Department of Engineering, Universidade Federal Rural do Semi-Árido, Caraúbas, Rio Grande do Norte

    Castelo Branco, V. T. F.
    Department of Transportation Engineering, Universidade Federal do Ceará, Fortaleza, Ceará

    Vasconcelos, K.
    Polytechnic School, Universidade de São Paulo, São Paulo, São Paulo

    Bhasin, A.
    Civil Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX


    Stock #: JTE20210155

    ISSN:0090-3973

    DOI: 10.1520/JTE20210155

    Author
    Title The Impact of the RAP Cluster Dissociation on Gradation and Shape Properties of Aggregates from Recycled Asphalt Mixtures
    Symposium ,
    Committee D04