Yield stress of cement grouts
2017 (English)In: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 61, 50-60 p.Article in journal (Refereed) Published
The 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. © 2016 Elsevier Ltd
Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 61, 50-60 p.
Cement grout, In-line rheology, Pulsed Ultrasound Velocimetry + Pressure Difference, Thixotropy, Yield stress, Cements, Dielectric losses, Elasticity, Grouting, Mortar, pH effects, Prestressed materials, Rheometers, Ultrasonic applications, Cement grouts, Direct measurement, Grouting designs, In-line measurements, Measurement techniques, Pressure differences, Velocity profiles
IdentifiersURN: urn:nbn:se:kth:diva-195124DOI: 10.1016/j.tust.2016.09.009ScopusID: 2-s2.0-84988643522OAI: oai:DiVA.org:kth-195124DiVA: diva2:1048263
Correspondence Address: Rahman, M.; KTH – Royal Institute of Technology, Brinellvägen 23, Sweden; email: firstname.lastname@example.org. QC 201611212016-11-212016-11-022016-11-21Bibliographically approved