Journal of Materials and Engineering Structures
Volume 8, Numéro 3, Pages 325-339
2021-09-30
Influence Of Polycarboxylic Ether-based Superplasticizers (pce) On The Rheological Properties Of Cement Pastes
Authors : Harichane A. . Benmounah A. .
Abstract
The main difficulty encountered in the formulation of Self-Compacting Concrete (SCC) (SCC) consists in choosing the most effective cement-superplasticizer pair allowing obtaining maximum water reduction, good workability and satisfactory rheology of the concrete during the setting time implemented. Achieving the greatest workability depends on the compatibility between the admixture and the cement used. The purpose of this work is to verify the compatibility of two superplasticizers based on polycarboxylic ether PCE with CEM II 42.5 cement and to study the influence of PCE on the rheological properties of a cement paste. The experimental study is based on the measurement of the flow time in the Marsh cone of a cement grout with and without the addition of silica fume by varying the W/C ratio, the dosage and the type of PCE. A full factorial design was proposed in this paper to study the cement-PCE interactions, and to optimize the choice and the dosage of superplasticizer for the studied cement. Good fluidity was obtained with PCE1 for a W/C ratio = 0.4 and a superplasticizer dosage of 1.25%. The compatibility between the two PCEs and the cement mixed with 10% silica fume (SF) has already been studied. SF increases the saturation dosage of PCE1 from 1.25 to 1.5, and decreases their fluidifying power.
Keywords
Fluididity ; Superplasticizer PCE ; Marsh Cone ; Factorial Design
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