Abstract
ABSTRACT Effectiveness of superplasticizer is an effect of complex system of factors connected mainly with concrete components properties, concrete composition and concreting conditions. From among these factors the key role for the superplasticizer effectiveness plays interaction of cement and superplasticizer. Selection of cement - superplasticizer system determines also workability of fresh concrete and thus also possibility of performing of HPC. In the paper methodology and results of the investigation into the influence of different superplasticizers on the rheological properties of modified, for the sake of superplasticizer addition and W/C ratio, standard mortars (according PN EN 196—1:1996) with different cements are presented. The rheological parameters of these mortars, yield value and plastic viscosity were determined using a rheometrical methods. In the research program the influence of following factors: chemical origin of superplasticizers (SNF, SMF, PC and PE superplasticizers), cement composition (cements of different C3A, Na2Oeq and SO3 content) and cement specific surface, superplasticizer dosage and W/C ratio were investigated. On the basis of test results the relationships between cement and superplasticizer properties and rheological properties of cement mortars were defined and discussed. These relationships in form of mathematical models can be used in workability shaping process to select optimal cement - superplasticizer system.
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