Effect of superplasticizer dosage on the rheological characteristics of self-compacting concretes
Keywords:
Self compacting concrete, Rheology, Superplasticizer, Viscosity, Yield stressAbstract
The use of superplasticizers in self-consolidating concretes (SCC) is essential to ensure the desired fluidity. Through this experimental work, we aim to study the effect of the superplasticizer dosage on the characteristics of SCC. The rheological properties of the mixtures are studied by means of a high torque rheometer with couette geometry. In addition, tests of EN NF 206 / CN standard were achieved to make a comparison with rheometer tests. The results showed that superplasticizers improve the workability of SCC by significantly decreasing the static and dynamic shear thresholds. However, their effect on the plastic viscosity depends strongly on the dosage used. Moreover, the increase in the superplasticizer dosage is always accompanied by a decrease in the stability of the mixture, which can lead to losses in mechanical strength.
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