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Best practices for concrete pumping.
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2016-12-01
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Edition:Final report
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Abstract:Pumping is one of the major placement techniques used in the concrete industry to deliver concrete
from the mixing truck to the formwork. Although concrete pumping has been used to place concrete since
the 1960s, there is still a lack of exact knowledge supported by research evidence as to what affects concrete
pumpability and how pumping changes concrete properties. A three-phase research study was carried out to
(1) investigate performance of pumped concrete in field conditions, (2) identify concrete properties affecting
pumpability, and (3) assess the effects of pumping on the concrete air void system. In the first phase of the
research program, six Kansas Department of Transportation (KDOT) project sites were visited during the
summer of 2015, and concrete was sampled before and after pumping. In addition to measuring fresh
concrete properties as well as performing hardened air void analysis of all sampled mixtures, rheological and
tribological tests were performed on sampled concrete. The second phase of the study consisted of a fullscale
controlled pumping experiment. During the experiment, three different concrete mixtures were
pumped, and both fresh and hardened properties of the concrete were determined. Additionally, the pumping
system was equipped with strain gauges to measure pumping pressures. Finally, the third phase of the study
consisted of measuring the rheological and tribological properties of 35 concrete mixtures in order to
determine the effect of various concrete components on pumpability.
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[PDF-1.30 MB]
