Plaster construction, alabaster.
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Plaster construction — the most ancient construction material, it is dazzling white color or light gray in the form of powder. Construction plaster is the thin powder produced from a plaster stone by roasting and a grinding or a grinding and roasting. Advantages of construction plaster is fast fight and hardening. The beginning of a skhvatyvaniye of plaster has to come not earlier than 4 min., the end — not earlier than 6 min., but no later than half an hour after preparation of the plaster test. To make plaster dough it is necessary to take on 2 parts (on weight) plaster, 1 part of cold water, and first of all pouring in water, and in it vigorously mixing, pour plaster. The made plaster dough needs to be spent at once. For delay of a skhvatyvaniye add to plaster dough 0,5 … 2% of water-soluble animal glue (in the form of glue water with a strength from 0,5 to 2%), limy solution and to put on a plastic bag ware. At a skhvatyvaniye and curing plaster construction is capable increases in volume to 1% that has important practical value at many construction works.