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Open AccessArticle

The Influence of Bleeding of Cement Suspensions on Their Rheological Properties

Institute for Building Materials Science, Leibniz Universität Hannover, 30167 Hannover, Germany
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Materials 2020, 13(7), 1609; https://doi.org/10.3390/ma13071609
Received: 28 February 2020 / Revised: 27 March 2020 / Accepted: 30 March 2020 / Published: 1 April 2020
(This article belongs to the Special Issue Rheology of Reactive, Multiscale, Multiphase Construction Materials)
Flowable concretes tend to segregate. The risk of segregation is particularly high when the concrete is vibrated during the compaction process. A well-known segregation phenomenon is the so-called “bleeding”. This is a rise of water to the surface of the freshly poured concrete due to the difference in density between the mixing water and the concrete’s denser solid components (aggregates, cement and additives). This type of segregation occurs particularly within the paste. The focus of this paper is, therefore, on the sedimentation behavior at the microscale of concrete and especially on the influence of this process on rheological properties of the cement paste. In addition to common bleeding tests of cement suspensions using standing cylinders, rheometric measurements were performed on the suspensions during the bleeding process. A measuring procedure was developed for the rheometric measurements of the sedimenting cement suspensions. The rheological properties of the investigated cement suspensions were determined at four specific measuring times and at four specific measuring heights (i.e., positions) each. With this method it could be shown that the cement suspensions are not homogeneous over their height and that bleeding has a great influence on the rheological properties of cement suspension. View Full-Text
Keywords: bleeding; cement suspension; rheology bleeding; cement suspension; rheology
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von Bronk, T.; Haist, M.; Lohaus, L. The Influence of Bleeding of Cement Suspensions on Their Rheological Properties. Materials 2020, 13, 1609.

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