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Quality klinkera defines all properties portlandtsementa, the additives entered into cement, only regulate its properties. Quality klinkera depends on its chemical and mineral structure, carefulness of preparation of a raw mix, conditions of carrying out of its roasting and a mode of cooling turned out klinkera. Klinker usually receive in the form of the caked granules in the size of 10-40 mm having a difficult microstructure as klinker includes a number of crystal phases and a quantity steklovidnoj phases.
The Chemical compound klinkera express the maintenance of oxides (% on weight). The main oxides are: okis calcium, silicon dioxide, okis aluminium and okis gland which total quantity makes 95-97% In small amounts in the form of various connections alkalis, dioxide of the titan, okis chrome, phosphoric anhydride can enter okis magnesium, sulfuric anhydride. in the course of the roasting which is lead up before sintering, the main oxides form silicates, aluminates and aljumoferrit calcium in the form of minerals of crystal structure, and their some part leaves in steklovidnuju a phase. Mineral structure klinkera. The basic minerals klinkera are: alit, bleaches, trehkaltsievyj aluminate and aljumoferrit calcium.
Alit - the most important mineral klinkera, defining speed tverdenija, durability and other properties portlandtsementa; contains in klinkere in number of 45 60%. Alit represents a firm solution trehkaltsievogo silicate and a small amount and other impurity which can essentially influence structure and properties. According to Regur and Gine, in an interval between normal temperature and 1100°С trehkaltsievyj silicate crystallises in six polymorphic forms.
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