Materiales de Construcción, Vol 51, No 263-264 (2001)

Secondary raw materials for synthesising new kind of cements


https://doi.org/10.3989/mc.2001.v51.i263-264.354

S. Goñi
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

A. Guerrero
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

M. A. Macías
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

R. Peña
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

E. Fernández Escalante
Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC), Spain

Abstract


The present paper is a comparative study of some characteristics of new belite cements obtained from two kind of wastes, which were used as secondary raw materials: fly ash (FA), of low CaO content, from coal combustion, and ash from incineration of municipal solid waste (MSWIA). Cements were synthesised in a range of temperature between 700°C and 900°C from MSWIA and FA, which were previously activated by hydrothermal treatment at 200°C The evolution of cemented phases with the heating temperature was followed by X-ray diffraction (XRD). The results were compared with those obtained from heating the starting FA and MSWIA without the previous hydrothermal treatment. The degree of hydration was quantitatively evaluated by the combined water content, determined from thermogravimetric analyses, during a period of 28 days or 200 days from mixing depending of hydration kinetics of each cement.

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