Flow Behavior of Fresh Very High Strength Portland Cement Pastes

Autor:	L Ceccon, L. Piani, A. Papo, Veronica Novelli
Rok vydání:	2010
Předmět:	Cement Portland Cement Pastes rheological models shear stress superplasticizers water reducers Materials science General Chemical Engineering Flow (psychology) Superplasticizer Viscometer law.invention Shear rate Portland cement Rheology law Shear stress Forensic engineering Composite material
Zdroj:	Particulate Science and Technology. 28:74-85
ISSN:	1548-0046 0272-6351
Popis:	Flow behavior of fresh very high strength portland cement pastes prepared at various water/cement ratios was studied by using a rate-controlled coaxial cylinder viscometer (Rotovisko-Haake 20, system M5-osc., measuring device MV2P with serrated surfaces). The tests were performed under continuous flow conditions. Experimental shear stress and shear rate data were fitted very satisfactorily with various models, one of which has already been proposed by the authors. Excellent results were achieved also by applying the Quemada equation. In addition, the influence of two different commercial superplasticizing agents (Concretan RX and Ergomix 1000, the former based on polycyclic copolymers with modified structures, carrying hydroxylated side chains, and the latter on a modified polyacrylic resin) was studied with the aim of determining their optimum dosage and verifying the effectiveness by comparing rheological results with those obtained in a previous work on an ordinary portland cement. The use of superplas...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3a810d3301ce354144e0eb39fffc2f8 https://doi.org/10.1080/02726350903408209 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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