The Influence of Bleeding of Cement Suspensions on Their Rheological Properties
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...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-04-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/13/7/1609 |
| _version_ | 1797571774791024640 |
|---|---|
| author | Tabea von Bronk Michael Haist Ludger Lohaus |
| author_facet | Tabea von Bronk Michael Haist Ludger Lohaus |
| author_sort | Tabea von Bronk |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T20:45:22Z |
| format | Article |
| id | doaj.art-d91237ced31b421b92e5ca7af9cf309d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T20:45:22Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-d91237ced31b421b92e5ca7af9cf309d2023-11-19T20:21:33ZengMDPI AGMaterials1996-19442020-04-01137160910.3390/ma13071609The Influence of Bleeding of Cement Suspensions on Their Rheological PropertiesTabea von Bronk0Michael Haist1Ludger Lohaus2Institute for Building Materials Science, Leibniz Universität Hannover, 30167 Hannover, GermanyInstitute for Building Materials Science, Leibniz Universität Hannover, 30167 Hannover, GermanyInstitute for Building Materials Science, Leibniz Universität Hannover, 30167 Hannover, GermanyFlowable 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.https://www.mdpi.com/1996-1944/13/7/1609bleedingcement suspensionrheology |
| spellingShingle | Tabea von Bronk Michael Haist Ludger Lohaus The Influence of Bleeding of Cement Suspensions on Their Rheological Properties Materials bleeding cement suspension rheology |
| title | The Influence of Bleeding of Cement Suspensions on Their Rheological Properties |
| title_full | The Influence of Bleeding of Cement Suspensions on Their Rheological Properties |
| title_fullStr | The Influence of Bleeding of Cement Suspensions on Their Rheological Properties |
| title_full_unstemmed | The Influence of Bleeding of Cement Suspensions on Their Rheological Properties |
| title_short | The Influence of Bleeding of Cement Suspensions on Their Rheological Properties |
| title_sort | influence of bleeding of cement suspensions on their rheological properties |
| topic | bleeding cement suspension rheology |
| url | https://www.mdpi.com/1996-1944/13/7/1609 |
| work_keys_str_mv | AT tabeavonbronk theinfluenceofbleedingofcementsuspensionsontheirrheologicalproperties AT michaelhaist theinfluenceofbleedingofcementsuspensionsontheirrheologicalproperties AT ludgerlohaus theinfluenceofbleedingofcementsuspensionsontheirrheologicalproperties AT tabeavonbronk influenceofbleedingofcementsuspensionsontheirrheologicalproperties AT michaelhaist influenceofbleedingofcementsuspensionsontheirrheologicalproperties AT ludgerlohaus influenceofbleedingofcementsuspensionsontheirrheologicalproperties |