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    Volume 47, Issue 2 (February 2019)

    Albedo Estimation of Finite-Sized Concrete Specimens

    (Received 27 January 2017; accepted 24 August 2017)

    Published Online: 25 April 2018

    CODEN: JTEVAB

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    Abstract

    Albedo in the context of the Urban Heat Island contributes to the environmental impact of a pavement. Measuring the pavement albedo is difficult as it depends on the size of the specimen, background interference, and variations in the incoming solar spectrum. For this study, the albedo was determined for a 1-m2 concrete slab cast with white cement containing titanium dioxide nanoparticles. The size of the exposed surface of the slab was varied using black paper. To calculate the albedo of these nonstandard specimen sizes, a new testing technique was proposed that uses an albedometer and various geometric conditions, including the exposed slab surface and measurement height. The albedo of the finite-sized concrete specimen was found to range from 0.50 to 0.55, depending on the number of unknowns assumed, with the most reasonable estimate of 0.54. The measured slab albedo from the new method was also verified using a laboratory spectrophotometer. With this proposed methodology to account for background surfaces, the albedo of laboratory-sized concrete specimens of any shape can now be easily measured at various test site locations.

    Author Information:

    Sen, Sushobhan
    Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL

    Roesler, Jeffery
    Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL

    King, Daniel
    Iowa Concrete Paving Association, Ankeny, IA


    Stock #: JTE20170059

    ISSN:0090-3973

    DOI: 10.1520/JTE20170059

    Author
    Title Albedo Estimation of Finite-Sized Concrete Specimens
    Symposium ,
    Committee E60