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Title: Effects of composition and exposure on the solar reflectance of Portland Cement Concrete

Abstract

Increasing the solar reflectance (albedo) of a paved surface keeps it cooler in the sun, reducing convection of heat from pavement to air and thereby decreasing the ambient air temperature. Lower air temperatures decrease demand for cooling energy and slow the formation of urban smog. Variations with composition and environmental exposure of the albedos of portland cement concrete pavements were investigated through laboratory fabrication and exposure of 32 mixes of concrete. Concrete albedo generally correlated with cement albedo and sand albedo and, after abrasion, with rock albedo. Cement albedo had a disproportionately strong influence on the reflectance of concrete. Simulated weathering, soiling, and abrasion each reduced average concrete albedo, though some samples became slightly more reflective through weathering or soiling. Concrete albedo grew as the cement hydration reaction progressed, but stabilized within six weeks of casting.

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Energy Efficiency and Renewable Energy. Building Technologies Program; Environmental Protection Agency (US)
OSTI Identifier:
817626
Report Number(s):
LBNL-50551
Journal ID: ISSN 0008-8846; CCNRAI; R&D Project: 80XY01; TRN: US200321%%464
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 32; Journal Issue: 11; Other Information: Journal Publication Date: 2002; PBD: 1 Jun 2002; Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY AND ECONOMY; 36 MATERIALS SCIENCE; 54 ENVIRONMENTAL SCIENCES; ABRASION; ALBEDO; CASTING; CEMENTS; CONCRETES; CONVECTION; ENVIRONMENTAL EXPOSURE; FABRICATION; HEAT EXCHANGERS; HYDRATION; PAVEMENTS; PORTLAND CEMENT; SAND; SMOG; SUN; WEATHERING; SOLAR REFLECTANCE CONCRETE AGGREGATE ACCELERATION AGING

Citation Formats

Levinson, Ronnen, and Akbari, Hashem. Effects of composition and exposure on the solar reflectance of Portland Cement Concrete. United States: N. p., 2002. Web. doi:10.1016/S0008-8846(02)00835-9.
Levinson, Ronnen, & Akbari, Hashem. Effects of composition and exposure on the solar reflectance of Portland Cement Concrete. United States. https://doi.org/10.1016/S0008-8846(02)00835-9
Levinson, Ronnen, and Akbari, Hashem. 2002. "Effects of composition and exposure on the solar reflectance of Portland Cement Concrete". United States. https://doi.org/10.1016/S0008-8846(02)00835-9.
@article{osti_817626,
title = {Effects of composition and exposure on the solar reflectance of Portland Cement Concrete},
author = {Levinson, Ronnen and Akbari, Hashem},
abstractNote = {Increasing the solar reflectance (albedo) of a paved surface keeps it cooler in the sun, reducing convection of heat from pavement to air and thereby decreasing the ambient air temperature. Lower air temperatures decrease demand for cooling energy and slow the formation of urban smog. Variations with composition and environmental exposure of the albedos of portland cement concrete pavements were investigated through laboratory fabrication and exposure of 32 mixes of concrete. Concrete albedo generally correlated with cement albedo and sand albedo and, after abrasion, with rock albedo. Cement albedo had a disproportionately strong influence on the reflectance of concrete. Simulated weathering, soiling, and abrasion each reduced average concrete albedo, though some samples became slightly more reflective through weathering or soiling. Concrete albedo grew as the cement hydration reaction progressed, but stabilized within six weeks of casting.},
doi = {10.1016/S0008-8846(02)00835-9},
url = {https://www.osti.gov/biblio/817626}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 11,
volume = 32,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 2002},
month = {Sat Jun 01 00:00:00 EDT 2002}
}