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Faculty of Metallurgy and Technology Travnička cesta 1, Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Faculty of Metallurgy and Technology Travnička cesta 1, Zenica, University of Zenica , Zenica , Bosnia and Herzegovina
Gypsum is added to the Portland cement clinker in the amount of 3 to 5% in the grinding phase as the binding rate regulator. When it comes to the hydration of cement, if sufficient amount of gypsum is added, fast cementation will not occur because gypsum by its presence reduces the solubility of tricalcium aluminate and thus slows down rapid reaction with water. In this way the undisturbed hydration process of tricalcium silicate and dicalcium silicate is enabled, which are the bearers of cement hydraulics. The hydration process of cement minerals is exothermic. The heat of hydration is not released at once, but gradually over a long period of time. Large amounts of heat, which is released during hydration, causes certain stresses and formation of voids and cracks in cement composite leading to reduced structural durability. In this paper is examined the influence of the added amount of gypsum on the standard consistency, initial setting time and final setting time, and the heat of hydration during the first 7 days of cement hydration.
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