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CASCUDO, O.; CARASEK, H. O saibro nas argamassas de assentamento : estudo de trabalhabilidade e comportamento no estado endurecido - parte 1. In: INTERNATIONAL SEMINAR ON STRUCTURAL MASONRY FOR DEVELOPING COUNTRIES, 5., 1994, Florianópolis. Anais... Florianópolis, 1994. p. 84-93.
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Abstract

Lots of pathologies in mortars appear on account of the use of clay-shale (named "saibro" in Brazil) in their composition. Among these harmful consequences to them, it is possible to emphasize shrinkage cracking, swelling, lost of bond and "powdering". "Saibros" are used as plasticizers of mortars, generaly replacing the lime in the Portland cement-lime mortars. In general, they have good plasticizing capability due to the amount of fine particles present in their clay-fraction. Thus, this work deals with the use of clay-shales ("saibros") as plasticizing admixtures in the mortars. Four kinds of "saibros" from the metropolitan region of Goiânia were investigated to be used in masonry mortars. These "saibros" were characterized in details, using methods as X-Ray diffraction, laser granulometry, etc. After this, it was carried out a workability study in order to define suitable proportions of clay-shale in the mixes, according to a rational method. (Nowadays is being carried out the second part of this research that takes a performance evaluation of the mixes produced in the part one, with the masonry and rendering mortars being studied with relation to their behavior on hardened state.)
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