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Building Materials

August 12, 2017 18:08

Density of gypsum as one of the important characteristics of the material

Where did he come to us?

Natural gypsum is a stone, which was formed by the evaporation of 200 million years ago, an ancient ocean.The origin of the gypsum effect on the fact that he is a stone - the rock of sedimentary origin.It is a dense, fine-grained structure and saccharoidal on a break, or randomly arranged with coarse crystals.In color it is yellowish white light brown and - depending on the various impurities in the rock.

Note!Alabaster - the best material for the creation of important small details that become part of home decorating.

history gypsum more than one thousand years.Its white color, the ability to harden in contact with water, as well as the ability to change the shape made it a popular choice among builders and sculptors.Even in ancient Egypt it was used for decoration.In antiquity it was a favorite material for the execution of ornaments, sculptures, figurines.Since then, at reasonable and very fair reasons, from a variety of different materials is alabaster remained the most popular among the builders.

properties, specific gravity and density of the gypsum

Alabaster used for the production of binders, interior decoration, in medicine.It is also ideal for removing the masks, modeling, stucco.What is gypsum?The basis of the composition - a plaster of paris.For the construction of this type of material used natural gypsum.Under the action of hot air it is dehydrated and crumbles.When water is added alabaster becomes plastic and drying for 6 minutes.Specific gypsum weight (density) of 2.32 grams per cubic centimeter.

interesting!To date, it produced 12 different brands of gypsum.

By means of heat treatment it is divided into two groups: vysokoobzhigovye and nizkoobzhigovye.The latter group includes the construction, high strength and molding plaster, and the first - Oestrich and anhydrite cement.gypsum properties enable its use without fillers, wherein cracks do not appear, since it does not shrink, but rather increases the volume.If, however, there is a need, then astringent for it can serve as sawdust, campfire, chips, slag, expanded clay.

material advantages and disadvantages

This material has the following useful properties:

  • Fast adhesive behavior.This feature is very useful in the production of various shapes and installation of beacons for plaster;
  • White color - an important feature for decorative finishes;
  • hardness of gypsum is low, which makes it easy;
  • resistance to fire and fire safety;
  • Good insulation against noise;
  • low heat conductivity;
  • Environmental cleanliness.

In construction it is used mainly for the production of parts made of gypsum: slabs and panels of partitions, drywall, masonry and so on.Also, it is necessary for mixing solutions for work with plaster.To reduce the material consumption gypsum composition made using sand or other aggregate.

The negative features include:

  • Low resistance to water;
  • low resistance and instability to mechanical stress;
  • limited shelf life (no more than three months);
  • Fast adhesive behavior is poor quality when working with a large number of plaster.

Note!After three months of storage alabaster loses up to 50% of their useful properties.