Thermal Curing and Environmental Impact of Alkali-Activated Cementitious Materials

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Title: Thermal Curing and Environmental Impact of Alkali-Activated Cementitious Materials

Author(s): Elien Dejager, Steffen Grünewald, and Geert De Schutter

Publication: Special Publication

Volume: 326

Issue:

Appears on pages(s): 21.1-21.10

Keywords: alkali-activated materials; CO2-emissions; mix design; strength development; thermal curing

Date: 8/10/2018

Abstract:

During the production of ordinary Portland cement (OPC) clinker a lot of carbon dioxide (CO2) is emitted. To improve the sustainability of concrete production, many studies were carried out to evaluate alternative binders for OPC. The use of alkali-activated cementitious materials (AAMs) reduces the amount of Portland cement clinker and a larger volume of industrial by-products such as fly ash (FA) and blast furnace slag (BFS) can be applied. The combination of an aluminosilicate precursor and an alkali activator is characterised by a slower early age strength development compared to OPC. Thermal curing of the concrete is a successful technique to overcome this drawback. Although, thermal curing promotes the early age strength development of OPC-based concrete, the strength at 28 days often is relatively lower. In terms of environmental impact of AAMs, a significant reduction in production-related CO2-emissions is possible by replacing OPC by FA and/or BFS. With a relatively small activator dosage, it was found that the CO2-emissions can be decreased by up to 85% for AAMs compared to OPC-based mixtures. In this research, the effect of the mix design and curing temperature on the early age strength development and the environmental impact of AAMs was investigated.




  

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