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- W306848825 abstract "This 94-page report presents the results of solar reflectance testing on 135 concrete specimens from 45 concrete mixes, representing a broad range of concrete mix designs. The purpose of this testing is to determine which combinations of concrete constituents will meet the solar reflectance index requirements in the Leadership in Energy and Environmental Design for New Construction (LEED-NC) Sustainable Sites credit for reducing the heat island effect. Samples for each component (cement, fine and coarse aggregates, and supplementary cementitious materials) were selected to test the broadest range of color (light to dark) of readily available materials for concrete construction. While all materials were tested, second round testing focused on concrete mixes with the darkest (lowest reflectance) combinations of materials, that is, those more likely to fail the LEED criteria requirements. The following conclusions are based on the solar reflectance measurements of 45 sets of concrete specimens representing exterior concrete flat-work: All concretes in this study have average solar reflectances of at least 0.30 (corresponding to an SRI of at least 29), and therefore meet the requirements of LEED-NC SS 7.1. These concretes also meet the requirements for steep-sloped roofs in LEED-NC SS 7.2. The lowest solar reflectances are from concretes composed of dark gray fly ash. The solar reflectance of the cement has more effect on the solar reflectance of the concrete than any other constituent material. The solar reflectance of the supplementary cementitious material (in this study, fly ash or slag cement) has the second greatest effect." @default.
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- W306848825 date "2007-01-01" @default.
- W306848825 modified "2023-09-27" @default.
- W306848825 title "Solar Reflectance of Concretes for LEED Sustainable Sites Credit: Heat Island Effect" @default.
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