A comparison of the fluidity of spherical cement with that of broad cement and a study of the properties of fresh concrete using spherical cement

摘要

The fluidity of spherical cement mortar can moreeasily be increased without strictly controlling the sizedistribution and volume of the aggregate than that of broadparticle size distribution cement, which is being developed forhigh-fluidity concrete by other researchers. Consequently,spherical cement is more practical for actual use. The changes ofslump value and slump flow with the passage of time aftermixing, the rate of bleeding, and the setting time of sphericalcement concrete were different from those of normal portlandcement concrete. These differences were due to the differencesbetween the two kinds of cement in activity of initial hydrationand the amounts of water and water-reducing agent in theirconcrete. The adiabatic temperature rise of spherical cementconcrete was about 6℃ less than that of normal portland cementconcrete as a result of the decrease in amount of cement used forsame strength appearance. Spherical cement is effective for low-heat concrete.