Experimental Observation on Variation of Rheological Properties during Concrete Pumping

Kyong Pil Jang, Seung Hee Kwon*, Myoung Sung Choi, Young Jin Kim, Chan Kyu Park, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Workability of concrete varies during pumping. Even though concrete satisfies the required workability before pumping, it often does not satisfy the required standard after pumping. Moreover, serious problem could happen such as segregation and blockage. In this study, the rheological properties of concrete change during pumping from the pressure distribution over the pipe length was investigated. The rheological properties and the pressures measured from seven different real-scale pumping tests with 116 m to 1000 m long pipelines and 24 MPa to 100 MPa concrete were analyzed. As a result, it was found that the rheological properties vary gradually along the pipeline, and could abruptly change inside the pump. The variation of rheological properties during pumping seems to be attributed in part to the increase of water absorption in aggregates under high pressure and the additional mixing effect, namely, intensive shearing under high pressure inside pump.

Original languageEnglish (US)
Article number79
JournalInternational Journal of Concrete Structures and Materials
Volume12
Issue number1
DOIs
StatePublished - Dec 1 2018

Keywords

  • concrete pumping
  • pressure
  • rheological property
  • shearing
  • workability

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering

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