A STUDY ON FACTORS THAT DECREASE THE FLUIDITY OF LIGHTWEIGHT CONCRETE AND HIGH STRENGTH, HIGH FLUIDITY CONCRETE DUE TO HIGH PRESSURE PUMPING

In this study, the effects of high pressure pumping on the fluidity of concrete were investigated by full-scale pumping tests and laboratory tests. From the result, changes in concrete fluidity due to high pressure pumping were determined. Also, it was possible to evaluate the changes in concrete fluidity by laboratory tests using a compact pumping test equipment. It was found that changes such as an increase in the apparent surface area of the cement particles and a change in the adsorption amount of admixture occurred by applying pressure and shear force to concrete using a compact pumping test equipment.