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Comparison of the strength developments of interground and separately ground marble-incorporated cement mortars

Kava, İsmail Tolga
Production of Portland cement clinker contributes significantly to global warming and has a large environmental footprint. To reduce the amount of kiln-produced clinker in cement, the use of substitute natural or industrial waste materials has been gaining popularity. The use of CaCO 3- containing natural materials such as limestone and waste marble pieces has been increasing around the world, particularly after modifications made to cement production standards. Two types of marble-containing blended Portland cements were produced; CEM II/A-L and CEM II/B-L according to TS EN 197-1. The marble content was varied from 0 to 30 % by mass of the clinker. Two different grinding methods, intergrinding and separate grinding were employed. Two different Blaine finenesses were targeted. Several properties of mortar specimens made with the blended cements were compared with each other and with the Portland cement control mortars. Separate grinding of raw materials gave higher compressive strengths than intergrinding, for all cases at all ages. The initial and final setting times of the interground cement mortars were considerably longer. The differences were attributed to differences in the particle size distributions and the median particle diameters of the clinker and additive in the cement.