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A simple test method to assess the influence of PCEs on the rheology of flowable cementitious systems

  • Today’s superplasticizers for self-compacting concrete and high Performance cementitious materials are very versatile. Typically superplasticizers are composed of a polycarboxylic backbone equipped with polyethylene oxide graft chains of variable length and grafting degree. The mode of operation of these admixtures is based on the steric repulsion of the particles upon adsorption. The adsorption is strongly depending upon the charge density of a superplasticizer and the time dependent Adsorption processes control the retention of the flow performance – an important issue particularly for ready-mix and construction site concrete. However, the properties of polycarboxylic superplasticizers typically remain a black box for users. The paper suggests a simple and rapid test method, which can be conducted without sophisticated equipment, to qualitatively distinguish between two types of superplasticizers based on the adsorption mechanism. Interpreting the results in the right way provides aToday’s superplasticizers for self-compacting concrete and high Performance cementitious materials are very versatile. Typically superplasticizers are composed of a polycarboxylic backbone equipped with polyethylene oxide graft chains of variable length and grafting degree. The mode of operation of these admixtures is based on the steric repulsion of the particles upon adsorption. The adsorption is strongly depending upon the charge density of a superplasticizer and the time dependent Adsorption processes control the retention of the flow performance – an important issue particularly for ready-mix and construction site concrete. However, the properties of polycarboxylic superplasticizers typically remain a black box for users. The paper suggests a simple and rapid test method, which can be conducted without sophisticated equipment, to qualitatively distinguish between two types of superplasticizers based on the adsorption mechanism. Interpreting the results in the right way provides a powerful tool to choose the right admixture for individual time dependent flow specifications.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Wolfram Schmidt, H.J.H. Brouwers, Hans-Carsten Kühne, Birgit Meng
Persönliche Herausgeber/innen:N. Roussel, H. Bessaies-Bey
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):1st international RILEM conference on rheology and processing of construction materials and 7th RILEM conference on self-compacting concrete (Proceedings)
Jahr der Erstveröffentlichung:2013
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.1 Baustoffe
7 Bauwerkssicherheit / 7.4 Baustofftechnologie
Herausgeber (Institution):RILEM
Ausgabe/Heft:Chapter 2.1.1
Erste Seite:1
Letzte Seite:8
Freie Schlagwörter:Adsorption; Polycarboxylate ether; Rheology; Slump flow
Veranstaltung:1st international RILEM conference on rheology and processing of construction materials and 7th RILEM conference on self-compacting concrete
Veranstaltungsort:Paris, France
Beginndatum der Veranstaltung:02.09.2013
Enddatum der Veranstaltung:04.09.2013
ISBN:978-2-35158-137-7
Verfügbarkeit des Volltexts:Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein