2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 6: Coatings, Cement, Rare Earth & Ferro-alloys

Editors:Kongoli F, Yildirim H, Hainer S, Hofmann K, Proske T, Graubner C.A., Albert B
Publisher:Flogen Star OUTREACH
Publication Year:2015
Pages:200 pages
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Investigation of the Carbonation Reactions in Eco-Friendly Cements

    Halil Yildirim1; Kathrin Hofmann2; Tilo Proske2; Stefan Hainer2; Carl-Alexander Graubner2; Barbara Albert3;
    1, Darmstadt, Germany (Deutschland); 2TECHNISCHE UNIVERSITAET DARMSTADT, Darmstadt, Germany (Deutschland); 3TECHNISCHE UNIVERSTIAET DARMSTADT, Darmstadt, Germany (Deutschland);
    Type of Paper: Regular
    Id Paper: 326
    Topic: 9


    The environmental impact of cement and concrete can be significantly decreased by the reduction of the amount of Portland cement clinker. The substitution of the Portland cement clinker with substitutes like limestone powder results in a decrease of hydration products, such as calcium hydroxide. However, a minimum amount of calcium hydroxide and a high density of the hardened cement pastes are necessary to ensure sufficient alkalinity, which is necessary for the passivation of the steel reinforcement during the life cycle of a building. The development of new eco-friendly cements requires a basic understanding regarding the durability against carbonation induced corrosion of the reinforcement. We are investigating low-water limestone-rich concretes with the aim for a sufficient prediction of the carbonation resistance and hope to support the development of sustainable cements. Because of the low content of hydration products, the approved models describing the carbonation behavior of conventional concretes are not working sufficiently for the mixtures investigated here and therefore, need to be modified. For that reason, the individual phase-pure clinker phases were synthesized and after complete hydration stored under CO2 atmosphere (2 Vol %, 20 A°C, 65% humidity) for 28 days. The products of the hydration- and carbonation-reactions were investigated with X-ray powder diffraction, thermal analysis (DTA/TG), scanning electron microscopy and energy-dispersive X-ray analysis. The results are compared to analyses of conventional clinker phases.


    Cement; Concrete; Durability; Environment; Hydration; Resistance; Sustainability;


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    Yildirim H, Hofmann K, Proske T, Hainer S, Graubner C, Albert B. Investigation of the Carbonation Reactions in Eco-Friendly Cements. In: Kongoli F, Yildirim H, Hainer S, Hofmann K, Proske T, Graubner C.A., Albert B, editors. Sustainable Industrial Processing Summit SIPS 2015 Volume 6: Coatings, Cement, Rare Earth & Ferro-alloys. Volume 6. Montreal(Canada): FLOGEN Star Outreach. 2015. p. 65-78.