The influence of the quality of silica fume on the workability and strength of high strength concrete was investigated, and the following results were obtained. (1) High strength concretes using 4 types of silica fume were all found to have good workability. (2) There was no difference in the strength of high strength concrete structures using the 4 different types of silica. (3) High strength concretes using silica fume as a mixed binder and as an admixture were both found to satisfy quality requirements.
