STP1557

    Impact of Lime and Liquid Additives on Life-Cycle Cost of Asphalt Pavements

    Published: Oct 2012


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    Abstract

    An extensive laboratory experiment was conducted to evaluate the impact of liquid and lime additives on the life-cycle cost of asphalt mixtures from five different sources around the United States: Alabama, California, Illinois, South Carolina, and Texas. Three types of mixtures were evaluated from each source: un-treated, liquid-treated, and lime-treated. The types of liquid additive were selected by the participating state agency (i.e., mix source) and were added at the rate of 0.5 % by weight of binder. A single hydrated lime source was used for all five sources at the rate of 1 % by dry weight of aggregates. The mechanical properties of the 15 asphalt mixtures at the undamaged and moisture-damaged stages were evaluated in the laboratory in terms of: strength (i.e., dynamic modulus), resistance to rutting, and resistance to fatigue cracking. The measured strength and resistances to rutting and fatigue cracking were used in the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) to assess the impact of the strength and mechanical properties of the various mixtures on the final performance of asphalt pavements. The results of the MEPDG were used to conduct comparative life-cycle cost analyses (LCCA) for asphalt pavements constructed with untreated, liquid-treated, and lime-treated asphalt mixtures from each of the five sources. The results of the LCCA showed that using hydrated lime in asphalt mixtures led to significant savings to the owner agency 100 % of the time, whereas using liquid anti-strip in the same asphalt mixtures may lead to significant cost increase to the owner agency.

    Keywords:

    asphalt mixture, anti-strip additive, moisture damage, mechanical properties, cost analysis, MEPDG


    Author Information:

    Sebaaly, Peter E.
    Professor and Director of WRSC, Univ. of Nevada, Reno, Nevada

    Hajj, Elie Y.
    Assistant Professor, Univ. of Nevada, Reno, Nevada

    Sathanathan, Thileepan
    Univ. of Nevada, Reno, Nevada

    Shivakolunthar, Sivakulan
    Univ. of Nevada, Reno, Nevada


    Paper ID: STP104321

    Committee/Subcommittee: C07.05

    DOI: 10.1520/STP104321


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