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Effects of concrete pumping on slump

Effects of concrete pumping on slump

Effects of concrete pumping on slump

(OP)
I know pumping reduces the air in concrete.  I was also under the belief that pumping more often than not reduced the slump as well, although not as consistently as with air.  I have a project where the slump at the truck is consistently lower than at the point of placement (after pumping).  Has anyone else experienced similar conditions?

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