SEDL / STP / STP1064-EB / STP23468S

The Influence of Limestone Additions on the Rheological Properties and Water Retention Value of Portland Cement Slurries

Neto, CS
Senior researcher, Concrete Technology Group, Instituto de Pesquisas Tecnológicas, São Paulo,

Campiteli, VC
Associate professortraineepostgraduate student, State University of Ponta GrossaInstituto de Pesquisas TecnológicasEscola Politécnica of University of São Paulo, ParanáSão Paulo,

Pages: 6    Published: Jan 1990

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Abstract

The recent changes on Brazilian specifications for Portland cement, in order to permit limestone additions, led to the necessity of knowing its influence in several aspects of the cement behavior when applied in civil construction.

In this paper the rheological properties, basically yield point and plastic viscosity, are determined in slurries made with cement which has up to 15% of limestone additions, in weight. For the same slurries the water retention value is obtained.

The variations in the yield point and plastic viscosity showed the “lubricity power” of the smaller particles (below 10 μm). Their amount is increased by the relatively greater grindability of the limestone concerning the clinker.

The limestone additions seem not to change the water retention value.