Life cycle assessment of recycled aggregate concrete containing fly ash

Abstract

Using life cycle assessment (LCA) method, this paper presents the impact of recycled aggregate concrete containing fly ash on the environment. To resolve the distribution problem in the inventory analysis, the characteristic cooperation parameter of concrete is used as distribution coefficient of environmental load. As is shown by the results, recycled aggregate concrete is an eco-material. By mixing fly ash, the green degree of recycled aggregate concrete can be improved further. The recycled aggregate concrete without containing fly ash can reduce the consumption of oil and the discharge of CO, C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">χ</sub> H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">γ</sub> and waste efficiently, but can not reduce the consumption of coal and the discharge of CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">χ</sub> and SO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> efficiently. However, by mixing fly ash, all the indexes mentioned above can be reduced efficiently.