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The Structure of the hardened cement improves also because formation in it of weak places in the form of friable hydroaluminates of calcium is prevented. Ettringit co-operates with ЗСаО-А12Оз, remained after izrashodovanija plaster additives, with formation of monosulfate of calcium. 2 300
Hydroaluminate communicates the additive of natural plaster as it is specified above, and hydroferrite is a part some cement gel.
Properties and formation of structure of the cement test. By careful mixture of a cement powder with water receive tse-metnoe the dough; it represents the concentrated water suspension possessing characteristic properties of structured disperse systems: durability of structure, structural and plastic viscosity, tiksotropiej.
The Cement dough before packing of a concrete mix and the beginning shvatyvanija has basically koaguljatsionnuju structure, in it firm particles of suspension are connected van-der-vaalsovymi by forces and linked owing to an interlacing gidratnyh the covers covering particles.
The Structure of the cement test collapses at mechanical influences (hashing, vibrating, etc.) thereof limiting pressure of shift and the dough with extremely destroyed structure sharply falls, like a viscous liquid, fills the form. Test transition in a fluidity has tiksotropnyj character, i.e. After the termination of mechanical influences structural communications in system are restored again.
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