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Original ' to training ' belita are served by fast enough cooling klinkera in the refrigerating devices which had at an exit klinkera from the furnace. Regulating speed of cooling klinkera, receive bleaches in the form of roundish dense crystals in the size 20-50 microns.
The Maintenance of minerals-silicates in klinkere portlandtsementa in the sum about 75%, therefore hydration alita and belita basically defines technical properties portlandtsementa. The others of 25% are made by the intermediate substance filling volume between crystals alita and belita. The intermediate substance consists of crystals trehkaltsievogo aluminate (С3А), aljumoferrita calcium (C4AF), glass and minor minerals.
Trehkaltsievyj aluminate in klinkere contains in number of 4-12% and under favorable conditions of roasting it turns out in the form of cubic crystals in the size till 10-15 a micron; forms firm solutions of difficult structure. Density С3А - 3,04 гсм3, it very quickly gidratiruetsja also hardens, but has small durability. Is at the bottom of sulphatic corrosion of concrete, therefore in sulfa-tostojkom portlandtsemente maintenance С3А is limited 5%.
Chetyrehkaltsievyj aljumoferrit in klinkere contains in number of 10-20%. The aljumoferritnaja phase of intermediate substance klinkera represents a firm solution aljumoferritov calcium of different structure, in klinkerah usual portlandtsementov its structure is close. Density C4AF - 3,77 гсм3. On speed of hydration the mineral occupies as though intermediate position between alitom and belitom, therefore it does not render defining influence on speed tverdenija and a thermal emission portlandtsementa.
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