Practical Study of Concrete with Classified Fly Ash in Hokuriku

When the classified fly ash will be used for concrete, the performance improvement is expected. However, these information are result of the basic study, and there is few example which the fly ash is normally used to ready mixed concrete of region. Herein, in recent years, the classifier device had been operated at Nanao-ota and Tsuruga fired power plants, and the classified fly ash whose quality was high and stability could be supplied. From the above backgrounds, this study was planed the utilization promotion of the classified fly ash in these two plants from the viewpoints of the environmental effect and the local production for local consumption to target the Hokuriku region extends over plural prefectures. Therefore, the various properties of concrete mixed with the classified fly ash for the aggregate of 6 types circulating at Hokuriku region were investigated in the indoor test. Moreover, the various properties of concrete mixed with the classified fly ash for the aggregate in Noto were investigated at an actual ready-mixed concrete plant in the prototype test. The conclusions were as follows; 1) in the indoor test, when the classified fly ash in Nanao-ota or Tsuruga used, the workability, the unti-segregation, the long age strength, the heat of hydration and the unti-chloride permeability were same or good, compared with those of concrete with N or BB. 2) in the prototype test, the workability, the strength and the heat of hydration were good, and it could be confirmed that the effective diffusion coefficient was same, compared with those of the indoor test.