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Rheological properties and sedimentation tendency

Reducing discolorations in fair-faced concrete surfaces – Influences of cement main constituents an


With the objective of reducing discolorations in fair-faced concrete surfaces due to sedimentation, systematic investigations, inter alia, were carried out on the influences of the cement main constituents clinker, limestone, and blastfurnace slag on the rheological properties of cement paste and concrete as well as on their interactions with plasticizing concrete admixtures. The influences of compaction by vibration on the tendency of mortar and concrete to sedimentation was also an object of the investigations. Once the quantity of concrete admixture necessary for maximum plastification (saturation point dosage) had been exceeded, sedimentation phenomena occurred with almost all known discolorations in fair-faced concrete surfaces. Compaction by vibration, by way of contrast, only had an insignificant influence on sedimentation tendency. The determination of the saturation point and the saturation point dosage is explained as well as pointers are given in respect of concrete composition. The determination of the saturation point and saturation point dosage will be clarified and pointers given in respect of concrete composition.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 12 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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