Title:
Experimental Observation on Variation of Rheological Properties during Concrete Pumping
Author(s):
Kyong Pil Jang, Seung Hee Kwon , Myoung Sung Choi, Young Jin Kim, Chan Kyu Park and Surendra P. Shah
Publication:
IJCSM
Volume:
13
Issue:
Appears on pages(s):
Keywords:
concrete pumping, rheological property, pressure, shearing, workability
DOI:
10.1186/s40069-018-0310-3
Date:
2/28/2019
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.