stanje i perspektive u rudarstvu i odrţivi razvoj mining present state ...

Rudarstvo 2011 / Mining 2011BendingMPaPressureMPastrength,strength,Sample 1 day 2 days 3 days 7 days 28 dayscement I 3,9 6,6 9,4cement II 3,6 6,9 8,9Sample 1 day 2 days 3 days 7 days 28 dayscement I 16,1 32,0 47,3cement II 14,7 30,0 44,7Quality estimationAccording to JUS. B. C1. 011, cements belong to the class of 45. (JUS)6.0. CONCLUSIONSummarising all technological research works and test results of mechanical properties of ash andgypsum pellets and finished concrete samples, the following can be concluded: Pellets made from waste gypsum and ash with 5 % of cement as binder meet the requirements interms of mechanical properties; Cement in which the powdered waste material (ash and gypsum) has been replaced by pellets, hasphysical and mechanical properties, i.e. technological properties during cement production similarto those of cement made in standard way (without pellets); The lab tests showed that the dissipation has been reduced significantly which makes handling ofthese materials in the plant much easier and that was one of the main objectives of the research.7.0. REFERENCESAnon., (1956). "The Pelletizing of Raw Materials", Cement Lime Manufakturer, Vol. 24,.Baker A. F., Mc Keever R. E., Deurbrouck A. W. (1982). Development and demonstration of aLignite Pelletizing, U. S. Department of Energy, Pittsburgh.Jovanović, V. (2002). Report on usage of pelletized mixture of gypsum and ash in cementindustry, ITNMS, Belgrade.Jovanović, V. (2000). Correlation between pelletization conditions and quality of fluoriteflotational concentrate pellets, Master degree thesis, Belgrade.Jovanović V., Radulović D., Martinović S. (2001). Application of molasses and lime mixture as abinding agent in the agglomeration of different powdered materials and their usage inmetallurgy, IX BMPC, Istanbul, Turkey.JUS. B.C1.011Ţivanović, B. (1981). Materials in Civil Engineering, University of Novi Sad.675