Queguay sedimentary limestones (Paysandu Dpt) are a very successfull portla
nd cement raw material because its low Mg++ content, but high silica percen
tage is an important handicap. Silica level is so high that one millon USA
dollar imported bauxite must be added in order to obtain adequate SiO2/ Al2
O3 rates. Geological knowledge about kaolinic clays at Blanquillos (Durazno
Dpt) suggested the study of this significant area of research for portland
cement formulation. A 85% limestone -15% kaolinic clay is a good raw mix f
or clinker manufacture. Feasibility study of this suggested technique is co
nsidered of priority because it may be a significant development socio-econ
omic agent.