Effect of the admixture on the concrete performance

In this experimental study, the silica fume, fly ash as mineral admixture and the plasticizers as chemical admixture are used in aim to produce the high performance concrete with a good workability which is produced and tested in reliable concrete batching plants. 9 series of concrete are produced in all. The cubes have 15x15x15 cm dimensions. The slumps are kept constant between 15 - 18 cm. In this aim, % 1,25 rate of the super plasticizer and hyper plasticizer as chemical admixtures with % 5, % 7,5, % 10 rate of silica fume and% 20, % 30, % 40 rate of fly ash are used instead of the cement. All series are tested in the 1st, 3rd, 7th, 28th, 56th and 90th days and their compressive strength is found. Additionally, the compressive strength gains of these series are compared. As a result, the fly ash has a positive effect on the workability of the fresh concrete and it can be given good results in a long term, and the silica fume has a negative effect on the workability of the fresh concrete but it gains the concrete a good compressive strength in a short term.