State and Arguments on Concrete Pumping

Abstract

Main arguments on concrete pumping have been derived from complicated behavior of fresh concrete in pressurized pipe. Fluidity and conditions of blockade are also influenced by de-watering characteristics under pressure or remoldability of fresh concrete, and pumpability could only be evaluated as a total balance of these factors. Therefore, evaluation of material factors, improvement of pumpability or challenge to a difficult condition should be made based on observations of concrete in an actual condition or in a condition very close to it.