Blaine (cement)
The Blaine value is a standardized measure for the degree of fine grinding of cement .
It is stated as the specific surface area (cm 2 / g) determined in a laboratory using the Blaine device . Standard Portland cement CEM I 32.5 has a Blaine value of approximately 3000 to 3500.
The Blaine value has a particular influence on the early strength that can be achieved with the cement and on the water requirement. The finer the cement is ground, the higher its water requirement and the higher it can be loaded after a short time.
If cement is to be ground to considerably higher values than 3500 Blaine, the demands on the mills and the separation technology used increase disproportionately. Early high-strength cements CEM I 42.5 or CEM I 52.5 with Blaine values of 4000 to 5500 cost significantly more than "normal" CEM I 32.5 due to the high mechanical and energetic effort involved in their production.
In individual cases, cements with Blaine values of up to 8000 were produced with extreme effort.
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- F. Gille: Checking the fineness of the grind with the Blaine machine. In: cement-lime-gypsum. Volume 4, No. 4, 1951, pp. 85-89.
- F. Gille: Checking the fineness of the grind with the Blaine machine. (= Series of publications of the cement industry. 7). Bauverlag, Wiesbaden 1951.