| you are: Inorganic knitting substances
To knitting the given system belong air and hydraulic izvest, romantsement, portlandtsement and its versions. Properties of the specified knitting substances depend on the hydraulic module and temperature of roasting of raw materials. The hydraulic module t expresses the maintenance of the basic oxide of SaO in relation to total quantity of acid oxides. Ãðèáû â ñìåòàíå
For each knitting substance the hydraulic module is characteristic. As air izvest the greatest hydraulic module is produced from limestones only with a small impurity of clay substance, at it; at hydraulic to exhaust; at romantsementa. Portlandtsement, received of carefully made artificial mix of a calcareous and clay component, are characterised by the hydraulic module approximately same, as at romantsementa. However durability indicators portlandtsementa many times over surpass durability romantsementa. It speaks that at reception romantsementa (and hydraulic to exhaust) raw materials roasting is made not before sintering (at temperature nearby 1000°С) and in these conditions are formed nizkoosnovnye silicates and the aluminates of calcium possessing in gidratirovannom a kind low durability. In technology portlandtsementa roasting of a raw mix is possible before partial fusion at ~ 1450°С and only in the presence of a liquid phase (rasplava) there is a synthesis trehkaltsievogo the silicate causing high indicators of durability and hydraulic properties.
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