Performance of Hot Mix Asphalt Mixtures Made of Recycled Aggregates

    Volume 42, Issue 2 (March 2014)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 22 January 2014

    Page Count: 12


    Rafi, Muhammad Masood
    Professor, Dept. of Earthquake Engineering, NED Univ. of Engineering and Technology, Karachi, Sindh

    Qadir, Adnan
    Professor, Dept. of Urban and Infrastructure Engineering, NED Univ. of Engineering and Technology, Karachi, Sindh

    Ali, Sajjad
    Laboratory Engineer, Dept. of Urban and Infrastructure Engineering, NED Univ. of Engineering and Technology, Karachi, Sindh

    Siddiqui, Salman Hameed
    Associate Professor, Dept. of Civil Engineering, NED Univ. of Engineering and Technology, Karachi, Sindh

    (Received 5 January 2013; accepted 16 September 2013)

    Abstract

    The generation of construction, renovation, and demolition waste in large quantities poses a major challenge for town planners. Recycling can provide an effective solution to this problem, in addition to reducing the rapid depletion of natural resources. This article examines the results of experimental studies that have been conducted to investigate the use of recycled aggregates (RAs) in mixtures of hot mix asphalt. Sources of RA consisted of waste concrete and reclaimed asphalt pavement. Three levels of RA addition with natural crushed stone aggregates (CSAs) and three types of mixtures were considered. The mixtures made with CSA were used as control samples. Marshall mix samples of asphalt-aggregate mixtures were prepared and tested in a Marshall testing machine. The air voids and stability/flow characteristics of these mixtures were investigated. The optimum asphalt contents (OACs) of mixtures were determined using air void data. The performance of the employed mixtures was compared with the criteria established by the National Highway Authority (NHA) for wearing course material in Pakistan. Rutting samples of mixtures similar to those used in the Marshall stability tests were prepared using the OAC data for bituminous binder. These samples were tested in a wheel tracking device. All three types of mixtures used in the studies conformed to the specification requirements for wearing course material given by the NHA. The rutting behaviors of the majority of the mixtures were also satisfactory.


    Paper ID: JTE20130004

    DOI: 10.1520/JTE20130004

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    Author
    Title Performance of Hot Mix Asphalt Mixtures Made of Recycled Aggregates
    Symposium , 0000-00-00
    Committee D04