Abstract
The following may be said within the scope of this study : 1) With delayed addition of superplasticizer, the yield value and plastic viscosity of paste will be greatly reduced. 2) With superplasticized concretes of identical mix proportions, slump will be higher the lower the yield value of the paste. 3) The yield value of paste after superplasticizing is higher the greater the delay in addition of the superplasticizer, and moreover, the faster the agitating speed after superplasticizing. But, it is hardly influenced by the agitating speed during superplasticizing. Therefore, slump loss will be more the later the time of superplasticizing, and the faster the agitating speed of the mixer after superplasticizing. And further, the agitating speed during superplasticizing will have little influence on slump loss.
