Abstract
A new type admixture was developed for high fluidity concrete in water-cement ratio of 40-55%. The cost of concrete using this admixture will be less expensive because of using less powder and admixture content. The productivity by real mixer in ready-mixed concrete plant, the properties of fresh and hardened concretes were studied on the mock-up test. The high fluidity concrete using this admixture was confirmed to have sufficient fluidity and filling ability, though that has a little larger flowing gradient and flowing velocity than usual high fluidity concrete with high volume powder. The qualities of this hardened concrete in structure, that are compressive strength, young's modulus, shrinkage, durability and distribution of coarse aggregate, were made clear by this experiment. The sufficient and uniform qualities of structural concrete were realized by this concrete.
