External Injection Method for Improvement of Concrete Pumpability
In this study, a new method was proposed to improve concrete pumpability. The friction between concrete and the internal surface of the pipe can be reduced by externally injecting a small amount of a chemical agent called a friction-reducing agent (FRA) into the pipe. The new idea was experimentally implemented with real-scale concrete pumping of 112, 137, and 518 m (367, 449, and 1700 ft) long pipelines. The experiments were performed with three different concrete mixtures and with the injection rate of the agent varying from 0.077 to 0.284% of concrete volume. It was found that the pumping pressure decreases from 26.6 to 60.2%. In addition, the rheological properties of concrete and the lubricating layer, and the viscosity of wet-screened mortar according to the dosage of FRA were measured. Based on analysis of these measurements, a method was proposed to quantitatively predict pressure reduction due to the external injection of the FRA.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
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Supplemental Notes:
- Abstract reprinted with permission from the American Concrete Institute.
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Authors:
- Kwon, Seung Hee
- Jang, Kyong Pil
- Lee, Jung Soo
- Publication Date: 2021-9
Language
- English
Media Info
- Media Type: Web
- Pagination: pp 17-28
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Serial:
- ACI Materials Journal
- Volume: 118
- Issue Number: 5
- Publisher: American Concrete Institute (ACI)
- ISSN: 0889-325X
- Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx
Subject/Index Terms
- TRT Terms: Lubricants; Predictive models; Pumped concrete; Rheological properties
- Subject Areas: Bridges and other structures; Highways; Materials; Pavements;
Filing Info
- Accession Number: 01789005
- Record Type: Publication
- Files: TRIS
- Created Date: Nov 19 2021 3:28PM