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Author(s):	Proske, Tilo; Rezvani, Moien; Hainer, Stefan; Graubner, Carl-Alexander
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Abstract:	Durch die Verringerung des Gehaltes an Portlandzementklinker im Beton werden dessen bilanzierte Umweltwirkungen deutlich reduziert. Um Potenziale und Grenzen des Mischungsentwurfs für umweltfreundliche Betone aufzeigen zu können, erfolgt im vorliegenden Beitrag zunächst eine Analyse der nationalen und internationalen Regelungen zu Grenzwerten der Betonzusammensetzung. Einbezogen werden sowohl die Regelungen in EN 206-1 und länderspezifische Angaben als auch die normativen Vorgaben in China und den USA. Für die betrachteten Regelwerke werden charakteristische Beispielrezepturen mit möglichst geringem Zementgehalt entworfen und hinsichtlich ihrer Umweltwirkung bewertet. Abschließend wird ein Vorschlag für eine mögliche Modifikation oder Erweiterung von DIN 1045-2 unterbreitet. Dieser soll die Basis für die Entwicklung neuartiger umweltfreundlicher Zemente und den effizienteren Einsatz von Zement bilden. Mix design for sustainable concrete based on international codes Environmental impact of cement can be significantly decreased by reducing the content of Portland cement clinker in cement and concrete. This paper deals with an analysis on limits and requirements of international codes including EN 206-1 and the national annexes as well as the regulations in China and USA. The potentials for development of environmentally friendly concretes in parallel with the normative and technical limits of the concrete mix design will be discussed. For this purpose, characteristic concrete mixtures with the lowest possible cement contents were calculated and consequently evaluated based on their corresponding environmental impacts. Finally, a proposal for the modification on current regulations in DIN 1045-2 is presented. This modification shall support the development and use of environmentally friendly cements with a low content of Portland cement clinker and the more efficient use of cement in the concrete.
Source:	Beton- und Stahlbetonbau 109 (2014), No. 10
Page/s:	726-741
Language of Publication:	German

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