| you are: Cement klinker
The Theory tverdenija portlandtsementa develops on the basis of basic works of Le-Shatele, Mihaelisa, A.A.Baykov, P.A.Rebindera and other outstanding scientists. The big contribution to a science about knitting substances have brought P.I.Bozhenov, P.P.Budnikov, JU. M.Butt, And. V.Volzhensky, V.A.Vorobev, S.I.Druzhinin, V.A.Kind, O.P.Mchedelov-Petrosjan, V.N.Jung, etc.
The Cement dough prepared by mixing of cement with water, has three periods tverdenija. In the beginning, during 1-3 ch after zatvorenija cement water, it is plastically and easily formed. Then comes shvatyvanie, coming to an end through 5-10 ch after zatvorenija; at this time the cement dough gets thick, losing mobility, but its mechanical durability is still insignificant. transition of the thickened cement test in a firm condition means the end shvatyvanija and the beginning tverdenija which is characteristic appreciable increase of durability. Tverdenie concrete under favorable conditions lasts for years - up to full hydration of cement.
Chemical reactions. Right after zatvorenija cement chemical reactions begin water. Already in an initial stage of process of hydration of cement there is a fast interaction alita to water with formation of hydrosilicate of calcium and gidrookisi.
After zatvorenija hydrate okisi calcium is formed from alita as bleaches gidratiruetsja more slowly alita and at its interaction with water less Sa (IT) 2 is allocated that is visible from the equation of chemical reaction.
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