Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Yield stress of cement grouts
HighlightsTwo ranges of yield stress, i.e., static and dynamic yield stress was measured.The static and dynamic yield stress should be used as the design input for grouting.The Flow Viz industrial rheometer can perform direct measurement of yield stress.The change of viscosity is abrupt just below and above the yield stress.
AbstractThe rheology of cement grout is complex due to its thixotropic nature and the presence of a yield stress. Despite the importance of the yield stress for grouting design, no standard methods are yet available to determine the yield stress. Most common methods are based on using conventional rheometers, but the results are subjective due to the measurement techniques, applied shear history and hydration. In this work, measurement of the yield stress of cement grout was performed with different measurement techniques using a conventional rheometer. In addition, in-line measurements using an ultrasound based technique were made in order to visualize the flow profile and perform a direct measurement of the yield stress. Two ranges of yield stress, static and dynamic yield stress, were measured. These results should be used for design purposes depending on the prevailing shear rate. The ultrasound based Flow Viz industrial rheometer was found capable of performing direct in-line measurement of the yield stress and providing a detailed visualization of the velocity profile of cement grout.
Yield stress of cement grouts
HighlightsTwo ranges of yield stress, i.e., static and dynamic yield stress was measured.The static and dynamic yield stress should be used as the design input for grouting.The Flow Viz industrial rheometer can perform direct measurement of yield stress.The change of viscosity is abrupt just below and above the yield stress.
AbstractThe rheology of cement grout is complex due to its thixotropic nature and the presence of a yield stress. Despite the importance of the yield stress for grouting design, no standard methods are yet available to determine the yield stress. Most common methods are based on using conventional rheometers, but the results are subjective due to the measurement techniques, applied shear history and hydration. In this work, measurement of the yield stress of cement grout was performed with different measurement techniques using a conventional rheometer. In addition, in-line measurements using an ultrasound based technique were made in order to visualize the flow profile and perform a direct measurement of the yield stress. Two ranges of yield stress, static and dynamic yield stress, were measured. These results should be used for design purposes depending on the prevailing shear rate. The ultrasound based Flow Viz industrial rheometer was found capable of performing direct in-line measurement of the yield stress and providing a detailed visualization of the velocity profile of cement grout.
Yield stress of cement grouts
Rahman, Mashuqur (Autor:in) / Wiklund, Johan (Autor:in) / Kotzé, Reinhardt (Autor:in) / Håkansson, Ulf (Autor:in)
Tunnelling and Underground Space Technology ; 61 ; 50-60
19.09.2016
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| Online Contents | 2017
| British Library Online Contents | 2017
| British Library Conference Proceedings | 1996
| British Library Conference Proceedings | 2002
Rheological measurements on cement grouts
| NTIS | 1986