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Titre: | Saturation point of superplasticizers determined by rheological tests for self compacting concrete |
Auteur(s): | Oualit, Mehena Irekti, Amar Melinge, Yannick |
Mots-clés: | Superplasticizers Saturation dosage Rheological tests elf compacting concrete |
Date de publication: | 2017 |
Editeur: | Budapest University of Technology and Economics |
Collection/Numéro: | Periodica Polytechnica Civil Engineering/ (2017);pp. 1-7 |
Résumé: | The dosage of superplasticizer is first determined in mortar
mixtures and it is after adjusted in concrete mix trials. Other
self compacting concrete (SCC) mix proportioning methods
rely on the definition of the superplasticizer saturation dosage
in pastes. These approaches to mix design have advantages
over the ones based exclusively on concrete batching because
it is less expensive and material demanding to perform tests
in mortar and paste than in concrete. This paper presents the
results of an experimental research carried out to investigate
the use of tests performed in paste to define the optimum
dosage of superplasticizer for self-compacting concrete. The
materials employed were Portland cement, pozzolana and
three types of superplasticizers: poly naphthalene sulfonate
(PNS), poly melamine sulfonate (PMS) and a polycarboxylate.
The saturation point of each superplasticizer was determined
in pastes by rheological tests using a coaxial cylinder rheometer
AR2000. Self-compacting concretes were prepared using
the superplasticizer contents found. The results obtained led
to the conclusion that in SCC mixture proportioning methods,
the determination of the superplasticizer content in the paste
phase is paramount. Nevertheless, final adjustment of w/c+f
ratio was always needed in order to produce SCC |
URI/URL: | http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/4568 |
ISSN: | 1587-3773 |
Collection(s) : | Publications Internationales
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