Abstract
The properties and hydration of blended cements containing from 8 to 40 % by mass of ceramic waste (CW) from different countries (Argentine and Czech Republic) are investigated. The mini slump, the heat released rate up to 48 h, the pozzolanic activity and the compressive strength at 2, 7 and 28 are determined. Hydration process is characterized by XRD analysis and the pore size refinement is accessed by MIP. Results show that both CWs increase the water demand with increasing the cement replacement level, and they possess pozzolanic activity after 7 days. At early age, the heat released and the compressive strength are lower than that of the Portland cement (PC) for all replacement levels. At 28 days, the pozzolanic reaction significantly improves the compressive strength. From XRD analysis, it is evident that CW reacts to form AFm phases (hemicarboaluminate at 7-28 and later transformed to monocarboaluminate) depending on the replacement level and CW used. CH peak reduction due to the pozzolanic reaction appears at 28 days. The reduction of porosity up to 16-24 % of CW replacement is in accordance with the compressive strength results.
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Acknowledgments
The authors gratefully acknowledge the financial supports received for this cooperation by the MINCyT of the Argentine Republic and the MEYS of the Czech Republic. The work was also partially supported by the Czech Science Foundation, under project No 14-04522S and by the ANPCyT under project PICT 0160-12.
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Rahhal, V. et al. (2015). Red Ceramic Wastes: A Calcined Clay Pozzolan. In: Scrivener, K., Favier, A. (eds) Calcined Clays for Sustainable Concrete. RILEM Bookseries, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9939-3_22
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DOI: https://doi.org/10.1007/978-94-017-9939-3_22
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