期刊
CEMENT & CONCRETE COMPOSITES
卷 32, 期 10, 页码 775-782出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2010.08.003
关键词
Paper sludge; Clay minerals; Thermal activation; Metakaolinite; Pozzolanic reaction
资金
- Spanish Ministry of Science and Innovation [CTM2006-12551-CO3-01/TECNO]
Calcined residual paper sludge can be reused and valorized in a safe an environmental way by the construction industry. The highly reactive metakaolin produced by calcination of the paper sludge exhibits good pozzolanic properties and permits its incorporation in cement systems. The pozzolanic reaction of metakaolin in Ca(OH)(2)-saturated solution at 40 degrees C is reported in this study as a function of time, up to 1 year. The stability of hydrates phases has been evaluated according to the evolving aqueous conditions. Analytical determinations of the solid phase show early formation of C-S-H phases and a later precipitation of laminar minerals, hydrotalcite and stratlingite, at the expense of the C-S-H phases. The thermodynamic calculations confirm the experimental observations. (C) 2010 Elsevier Ltd. All rights reserved.
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