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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Calcined Marl as a Pozzolan for Sustainable Development of the Cement and Concrete Industry
Author(s): Tobias Danner, Tone Ostnor, and Harald Justnes
Publication: Special Publication
Appears on pages(s): 1-12
Keywords: Calcined marl, pozzolan, compressive strength, lime consumption, microstructure
Abstract:Marl was calcined at temperatures between 600 and 1000 ºC and compressive strength of mortars was tested after 28 days curing at 20 ºC, when 20% of OPC was replaced by calcined marl at equal w/c-ratios. The clays were hold for 45 min. at the respective temperatures and the optimum calcination temperature with respect to reactivity as pozzolan seemed to be 800 °C. Higher replacement levels were tested for the most reactive temperature and even with a replacement level of 50% OPC the same strength as without cement replacement could be achieved. The 1-day strength for mortar with 50% calcined marl replacing cement was sufficient for demoulding concrete in field practice. Pozzolanicity was tested on pastes of calcined marl and calcium hydroxide in different ratios with an alkaline solution by the use of thermal analysis, XRD and SEM. Ca(OH)2 consumption and formation of hydration products was analysed after curing for 28 days and 6 month at 20 & 38 ºC.
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