Modern dry mixtures
Today we are already accustomed to a variety of dry mixtures on the shelves of construction stores. These are all kinds of plastering mixtures, adhesives for various tiles and stone, grouts and repair compositions. Sometimes for beautiful packaging we do not know what is hidden, and by what criteria it is better to make a choice.
Entire laboratories work on the compositions of high -quality dry mixtures. Using the latest achievements of science, unique compositions have been obtained, which give excellent qualitative results, which can not be said about the use of ordinary cement with sand. Producer firms retain recipes for mixtures secret. We know only a list of the main components of the components. These are inert fillers, astringent mineral, various additives to give a mixture of certain properties, as well as polymer binders.
The astringent mineral components represent the varieties of Portland cement (gray and white), as well as high -aluminum cement, which has the ability to quickly harden.
The quality of the cement used affects the properties of the dry mixture. If on the packaging with the mixture you will see the ISO 9001 sign, then the product is certified.
Hydrated lime is added to some mixtures to cements, which improves solution processing. She reacts with CO2 and hardens.
The next indispensable component for the manufacture of mixtures is fillers – quartz sand and limestone flour. Plastering thermal insulation mixtures have in their composition also vermiculite, expanded clay or polystyrene foam in granules.
To give a mixture of certain technical characteristics, such as water retention in the prepared solution, modifying additives are added. Water should not evaporate quickly, this is affected by the strength of the solution. The water retention function is performed by a polymer – a water -soluble ester of cellulose. It provides a cement-sand mixt with an increase in the use of the solution and increases the adhesion (fastening) of the solution with the base.
To avoid fakes, and they can prove themselves when it will be too late to fix something, try to purchase mixtures from trusted manufacturers.