Mineralogical and chemical evolution of hydrated phases in the pozzolanic reaction of calcined paper sludge

被引：58

作者：

Fernandez, Raul ^{[1
,2
]}

Neoreda, Belen ^{[2
]}

Vigil de la Villa, Raquel ^{[1
]}

Garcia, Rosario ^{[1
]}

Frias, Moises ^{[2
]}

机构：

[1] Univ Autonoma Madrid, Fac Ciencias, Dept Geol & Geoquim, E-28049 Madrid, Spain

[2] Inst Ciencias Construcc Eduardo Torroja CSIC, Madrid 28033, Spain

来源：

CEMENT & CONCRETE COMPOSITES | 2010年 / 32卷 / 10期

关键词：

Paper sludge; Clay minerals; Thermal activation; Metakaolinite; Pozzolanic reaction; SOLID-STATE NMR; THERMODYNAMIC PROPERTIES; METAKAOLIN; CEMENT; SYSTEM; WASTE; STRATLINGITE; TEMPERATURE;

D O I：

10.1016/j.cemconcomp.2010.08.003

中图分类号：

TU [建筑科学];

学科分类号：

081407 [建筑环境与能源工程];

摘要：

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.

引用

页码：775 / 782

页数：8

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