期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：12
页码：3676-3682
出版社：University of Mohammed Premier Oujda
摘要：During the production of the clinker in cement factories, it often happens that incidents which favor the production of the free lime. Like an inappropriate dosage of the raw mixture, or defect of grinding or ho mogenization of the raw mixture, an instant shutdown of the oven, a reducing burning of the clinker or a slow cooling of the clinker. In order to determine the impact of the lime not combined in the clinker on the properties of the cement, we prepared cements from clinkers having increasing contents of free lime varying from 2.18, 3.15, 4.2, 5.24 and 6.02 %. We realized several experiments by fixing the fineness of prepared cements: SSB = 3820 ± 50 cm 2 /g. These experiments showed that the content of water demand increases according to the increase of the percentage of the free lime, in more the expansion rises when the content of the free lime increases. The setting time also increases with the increase of the percentage of the free lime. Moreover, the heat of hydration rises while the free lime increases. Also the mechanical strength of 2, 7 and 28 days decreases according to the increase of the free lime
关键词：free lime; clinker; water demand; expansion; setting time; heat of hydration; mechanical strength.
