Effects of Ultrafine Powders on the Properties of the Lubrication Layer and Highly Flowable Concrete
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
The friction at the steel pipe–flowing concrete interface plays an important role in concrete pumpability. To reduce the friction or improve pumpability, in this paper, various ultrafine powders (nanoclay, , and microsized marble powder) are incorporated into a highly flowable concrete mixture with a low water-binder ratio () at a dosage of 1% (by weight) as a cement replacement. The effects of these ultrafine powders on rheology of the concrete and the properties of the lubrication layer, near the steel pipe–concrete interface, are studied by a portable rheometer and tribometer. The thickness of the lubrication layer of each concrete mixture is determined using a microindentation test method. The results show that 1% nanoclay and replacement increases the rheological parameter values (e.g., yield stress, viscosity) of both bulk concrete and the lubrication layer. However, 1% marble powder replacement largely reduces the viscosity of the lubrication layer as well as the pumping pressure. The thickness of the lubrication layer of the concrete mixtures studied is about 1–2 mm.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published paper.
Acknowledgments
The authors would like to acknowledge the financial support received from the National Natural Science Foundation of China (Grant No. 51578269). The rheometer and tribometer tests of this study were performed during the first author’s visit at Iowa State University (ISU), USA. The support from the Department of Civil, Construction and Environmental Engineering, ISU, on these tests is also greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 19, 2019
Accepted: Nov 18, 2019
Published online: Mar 3, 2020
Published in print: May 1, 2020
Discussion open until: Aug 3, 2020
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