Ceramics-Silikáty 42 (1) 25-28 (1998)

COMMINUTION AND MECHANICAL ACTIVATION OF PORTLAND CEMENT IN DIFFERENT MILL TYPES  

Z. Sekulic, S. Popov, S. Miloševic 

The experiments of comminution (grinding-mechanical activation) were performed in laboratorial ball mill, vibro mill with balls and vibro mill with rings, using Portland cement from the regular production. A noticeable mechanical activation was registered in vibro mill with rings (as confirmed by XRD analysis). In all three mill types, mechanical properties of ground cement were improved due to an increase of specific area to approximately the same value (400 m²/kg). The highest compressive and bending strengths were achieved in Portland cement comminuted in vibro mill with rings (55MPa and 9MPa, in comparison with the original PC values 43 MPa and 7.5 MPa respectively), as registered after 28 day solidification period. Thereby, the compressive strength was about 10 % higher and bending strength about 3.5 % higher then in the cement treated in  mill with balls until the same specific area was reached.

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