Measuring the Effective Air Void Content of Portland Cement Pervious Pavements

    Volume 25, Issue 1 (June 2003)

    ISSN: 0149-6123

    CODEN: CCAOAD

    Page Count: 5


    Badoe, DA
    Assistant Professor of Civil Engineering, Tennessee Technological University, Cookeville, TN

    Honeycutt, KR
    Graduate Research Assistant, Tennessee Technological University, Cookeville, TN

    Crouch, LK
    Professor of Civil Engineering, Tennessee Technological University, Cookeville, TN

    Cates, MA
    Graduate Research Assistant, Tennessee Technological University, Cookeville, TN

    Dotson, VJ
    Graduate Research Assistant, Tennessee Technological University, Cookeville, TN

    (Received 5 March 2002; accepted 11 March 2003)

    Abstract

    The current literature indicates that air voids of Portland Cement Pervious Pavements (PCPP) should be 15–25%, to achieve desired permeability. However, there is no current AASHTO or ASTM test method to determine PCPP air voids. This study is an attempt to modify currently available hot-mix asphalt (HMA) air determination techniques for PCPP. The equation used to determine air voids in HMA is Percent Air Voids=100(1Gmb/Gmm). Where Gmb is the bulk specific gravity of the specimen and Gmm is the theoretical maximum specific gravity of loose HMA. Previous research on HMA cores at Tennessee Technological University (TTU) has shown the INSTROTEK CORELOK SYSTEM to be a most effective means of determining Gmb of a material with surface accessible voids. Therefore, it was selected for determining Gmb of the PCPP cores. Gmm of PCPP cores must be determined in a compacted condition. Therefore, three modified techniques for determining the “effective” G” of PCPP were used. Air voids calculated from the effective Gmm will be referred to as effective air voids. Specifically, effective air voids are air voids accessible from the surface, which effect PCPP permeability. Thirty-three field PCPP cores were used in the study. The “cut bag method” using the INSTROTEK CORELOK SYSTEM was found to be the most accurate in determining the effective air voids of the PCPP cores. Further, compressive strengths of all cores were also determined. As expected, compressive strength of PCPP cores was inversely related to effective air voids. Correlation coefficients ranged from 0.367–0.989.


    Paper ID: CCA10516J

    DOI: 10.1520/CCA10516J

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    Author
    Title Measuring the Effective Air Void Content of Portland Cement Pervious Pavements
    Symposium , 0000-00-00
    Committee C01