| you are: manufacture Without waste air to exhaust
Klinkernoe glass is present at intermediate substance in number of 5-15%, it consists basically from CaO, A12O3, Fe2O3, MgO, K2O, Na2O. moydodur.ru
Okis of magnesium is a part aljumoferritnoj of a phase and klinkernogo glass, and also is present at a free condition in the form of crystals slowly gidratirujushchego a mineral periklaza. Hydration MgO lasts long, some years, and transition in Mg (OH) 2 are possible is accompanied by increase in volume of a firm phase in already hardened cement stone. at the maintenance okisi magnesium more than 5% this phenomenon can be at the bottom of non-uniform change of volume of cement at tverdenii and rastreskivanii concrete.
Free okis calcium of SaOsVob is in svezheobozhzhen th klinkere in the form of grains; its maintenance should not surpass 1%. At higher maintenance of SaOsVob quality of cement decreases and non-uniform change of its volume can be shown at tverdenii, SaO connected with transition in Sa (IT) 2.
Alkalis (Na2O, K2O) enter in aljumoferritnuju a phase klinkera, and also are present at cement in the form of sulphates. The maintenance of alkalis in portlandtsemente is limited in case of filler application (sand, gravel), containing reaktsionnosposobnye opalovidnye updatings of dioxide of silicon, because of danger rastreskivanija concrete in a design.
|
