Ceramics-Silikáty 42, (1) 25 - 28 (1998) |
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COMMINUTION AND MECHANICAL ACTIVATION OF PORTLAND CEMENT IN DIFFERENT MILL TYPES
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Sekulic Živko 1, Popov Svetlana 2, Milošević Siniša 1
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1 Institute for Technology of Nuclear and Other Mineral Raw Materials Belgrade,
Franche d'Epere 86, 11000 Belgrade, Yugoslavia
2 Faculty of Mining and Geology,
Djušina 7, 11000 Belgrade, Yugoslavia
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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 m²kg⁻¹). 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, Íhe 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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