- Verlag Bau + Technik
- Eintrag
Auswirkungen klinkereffizienter Zemente auf die Bauausführung
Verwendbarkeit, Verfügbarkeit und Wechselwirkungen
Kiltz, Denis / Meyer, Lars
Klinkereffiziente Zemente sind Zemente, die im Vergleich zu einem CEM I (Portlandzement) einen reduzierten Klinkeranteil aufweisen. Bei der Herstellung von Zementklinker entsteht eine große Menge des Treibhausgases CO2. Wird der Klinkeranteil reduziert, indem klinkereffiziente Zemente verwendet werden, sinkt der CO2-Fußabdruck des Zements. Damit sinkt auch der CO2-Fußabdruck des Betons, für den dieser Zement verwendet wird, sofern der Zementgehalt im Beton konstant bleibt. Die Verwendung von klinkereffizienten Zementen in Betonen führt zu Wechselwirkungen, z.B. zu einer langsameren Festigkeitsentwicklung. Auswirkungen dieser Wechselwirkungen auf die Bauausführung werden in diesem Beitrag vorgestellt und diskutiert. Bei dem Text handelt es sich um eine gekürzte Fassung des Beitrags „Auswirkungen klinkereffizienter Zemente auf die Bauausführung“ aus dem DBV-Heft 50 Nachhaltiges Bauen mit Beton, Band 2 „Quick Wins für den Klimaschutz“.
Effects of clinker-efficient cements on the construction process
Clinker-efficient cements are cements that have a reduced clinker content compared to a CEM I (Portland cement). If the clinker content is reduced by using clinker-efficient cements, the CO2 footprint of the cement decreases. This also reduces the CO2 footprint of the concrete for which this cement is used, provided that the cement content in the concrete remains constant. The use of clinker-efficient cements in concretes leads to interactions, e.g. slower strength development. It is to be expected that the use of clinker-efficient cements will increase construction costs and that more qualified personnel will be required on construction sites for coordination, quality assurance and construction. In addition, the use of clinker-efficient cements has consequences for scheduling and construction time. It is to be expected that the short construction times common today will no longer be possible to maintain in the future with high demands on climate protection. The use of clinker-efficient cements can lead to a classification in class BBQ-E (possibly also BBQ-S) according to DIN 1045-1000, e.g. if the strength development is slow or if the proof age deviates from 28 days. In such cases, it is very important to start communication between all parties involved at an early stage and during construction according to the approach of the Concrete Construction Quality Classes (tendering and execution discussions with the involvement of appropriate experts).
Effects of clinker-efficient cements on the construction process
Clinker-efficient cements are cements that have a reduced clinker content compared to a CEM I (Portland cement). If the clinker content is reduced by using clinker-efficient cements, the CO2 footprint of the cement decreases. This also reduces the CO2 footprint of the concrete for which this cement is used, provided that the cement content in the concrete remains constant. The use of clinker-efficient cements in concretes leads to interactions, e.g. slower strength development. It is to be expected that the use of clinker-efficient cements will increase construction costs and that more qualified personnel will be required on construction sites for coordination, quality assurance and construction. In addition, the use of clinker-efficient cements has consequences for scheduling and construction time. It is to be expected that the short construction times common today will no longer be possible to maintain in the future with high demands on climate protection. The use of clinker-efficient cements can lead to a classification in class BBQ-E (possibly also BBQ-S) according to DIN 1045-1000, e.g. if the strength development is slow or if the proof age deviates from 28 days. In such cases, it is very important to start communication between all parties involved at an early stage and during construction according to the approach of the Concrete Construction Quality Classes (tendering and execution discussions with the involvement of appropriate experts).
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beton 3/2023 ab Seite 72
Herausgeber des Artikels:
beton
bis beton 4/2022: Verlag Bau+Technik GmbH
ab beton 5/2022: Concrete Content UG
Wuppertal / Schermbeck
Tel: +49 (0) 2 02 7 69 92 69
Fax: +49 (0) 2 02 7 69 92 70
beton
bis beton 4/2022: Verlag Bau+Technik GmbH
ab beton 5/2022: Concrete Content UG
Wuppertal / Schermbeck
Tel: +49 (0) 2 02 7 69 92 69
Fax: +49 (0) 2 02 7 69 92 70