Calcium aluminate cements as an effective matrix for encapsulation of hazardous materials

Alvarez-Galindo, J.I. (José Ignacio); Fernandez-Alvarez, J.M. (José María); Duran-Benito, A. (Adrian); Perez-Nicolas, M. (María); Sirera-Bejarano, R. (Rafael); Navarro-Blasco, I. (Iñigo)

Keywords:

Landfilling
Solidification/Stabilization
Leaching
Calcium Aluminate Cement
Sludge

Issue Date:

Oct-2015

Project:

This work was funded by Fundación Universitaria de Navarra under grants FUNA 2010-15108152 and FUNA2013-15108402. The authors would like to thank Friends of University of Navarra Inc. for a pre-doctoral grant in favour of M. Pérez

Editorial note:

The Chinese Ceramic Society; China Building Materials Academy

Citation:

Navarro-Blasco I, Sirera R, Pérez-Nicolás M, Durán A, Fernández JM, Álvarez JI. ""Calcium aluminate cements as an effective matrix for encapsulation of hazardous materials"". EN: Proceedings of the 14th International Congress on the Chemistry of Cement (CD): Section 6, Alternative binders.

Abstract

The rationale is that polyphosphate-CAC matrices have shown interesting potential to solidify/stabilize heavy metals, owing to the aforementioned acid-base reaction that yields a compact and low porous matrix mainly composed of ACP - amorphous calcium phosphate -, which can be able to retain hazardous compounds. We aimed to take advantage of the reactivity of one of the sludge components: the sludges with relatively large concentrations of phosphate are expected to act themselves as reactants that, interacting with the CAC, could result in a very effective retaining system of the sludge constituents. Sludge samples from two locations have been incorporated in high proportion within the mix. We discussed the effects of the sludge on the CAC mortar and a possible interaction mechanism is provided.

URI:

https://hdl.handle.net/10171/39233

Appears in Collections:

DA - Ciencias - MATCH - Capítulos de libros
DA - Ciencias - Química - Capítulos de libros

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