MATEC Web of Conferences
Volume 11, 2014International Congress on Materials & Structural Stability
|Number of page(s)||3|
|Section||Materials & Pathologies|
|Published online||28 April 2014|
Specific Examples of Hybrid Alkaline Cement
Department of cement and materials recycling, Eduardo Torroja Institute of construction sciences, (IETcc-CSIC), Madrid, Spain
Hybrid alkaline cements are obtained by alkali-activating cementitious blends in the Na2O-CaO-SiO2-Al2O3-H2O system. The present paper discusses the results of activating different cementitious blends containing a low OPC clinker content (<30%) and a high content of supplementary cementitious materials (such as Fly ash). To obtain useful early mechanical strengths (> 15MPa a 2 days) different alkaline activators were used (liquid and solid). The reaction products obtained were also characterised by XRD, SEM/EDX and 27Al and 29Si NMRMAS. The results showed that the main reaction product was a mix of cementitious gels C-A-S-H and (N,C)-A-S-H, and that their relative proportions were strongly influenced by the calcium content in the initial binder
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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