Today, like many
Today, like many centuries ago, the table is considered the central element of the composition, and its selection is given special attention.
Toilet and serving tables
In the XVIII century, toilet and serving tables (jardiner) came into fashion.
Reinforced concrete, hydraulic
There are also mixed varieties and acid -resistant compositions.
Predominance of magnesite
The following varieties of cement are now distinguished: Portland cement with a predominance of alit (three -calcium silicate); alumina composition based on alumina and calcium aluminum; Magnesial, with a predominance of magnesite.
Of the firing
Until the 19th century, scientists experimented with a cement recipe, introducing and replacing the ingredients with various mineral inclusions.
Gradually people noticed
With the onset of the Middle Ages, ancient knowledge was lost, but gradually people noticed that the deposits of limestones contaminated with clay have special strength and water resistance, even surpass the famous Roman composition in operational characteristics.
Much better
Thus, by conducting a comparative analysis, we can judge that in the Russian Federation things are much better.