Resumo

RODRIGUEZ, Ana M; ROMERO, Jorge W  e  CASTRO OLIVARES, Eleodoro. REFRACTARIC BEHAVIOR OF MORTAR PROBES CONFORMED WITH DIATOMITE AS MINERALS AGGREGATE. Rev.Colomb.Quim. [online]. 2005, vol.34, n.2, pp.139-146. ISSN 0120-2804.

On the search of new applications for regional mining resources the aim of this work is to study the pozzolanic properties of some minerals which may potentially react with the protlandite contained in Portland cement pastes and mortars. The possibility that these mineral additions may also increase thermal resistance and refractarity is also studied by measuring, as a parameter, the mechanical strength variations of standardized probe. In this search, natural silico-aluminates minerals resources (diatomites) are selected and chemical compositions of which are very similar to the natural pozzolanes, referred to as "active" in the literature. The programmed experimental development consists in thermal treatment of the mineral and size reduction so that it became compatible with cement grain size, pozzolanity analysis, construction of mortar probes. Mechanical residual properties of the probes are measured after exposure to high temperature. By analyzing the experimental results it may be concluded that the aggregate under study certainly shows pozzolanic properties and in addition, it improves the residual mechanical resistance of the probes.

Palavras-chave : Portland cement aggregates; calcinated diatomites; refractarities; improvement properties.

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