Relating the molecular structure of comb-type superplasticizers to the compression rheology of MgO suspensions

Ane Mette Kjeldsen, Rober Johan Flatt, Lennart Bergström

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We have investigated the effect of superplasticizers on the rheological properties of concentrated MgO suspensions. The comb-type anionic polymers with grafted polyethylene oxide chains adsorb onto the MgO surface and infer a steric repulsion where the range scales with the length of the PEO side chains. Consolidation experiments, where the volume fraction gradient of particle networks has been determined in response to a centrifugal force field, offer a simple, yet accurate, way of investigating flocculated, partly stabilized and stable suspensions under compression. The compression rheology behaviour could be related to the estimated thickness of the adsorbed superplasticizers and a scaling analysis was used to quantitatively assess the importance of the length of the grafted PEO-chains on the magnitude of the inter-particle bond strength.
Original languageEnglish
JournalCement and Concrete Research
Volume36
Issue number7
Pages (from-to)1231-1239
ISSN0008-8846
DOIs
Publication statusPublished - 2006

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