Lime.

Building lime, used for making mortar and concrete mixtures, separated by curing the hydraulic (hardens in the air and water) and air (only hardens in the air). Lime is manufactured by burning limestone in a special rotating shaft or furnaces. After firing turns lime (or lime lump-kipelka). quenched by pouring lime with water at the rate of 10 kg of lime 03.04 buckets of water. In the process of slaked lime as it boils, scattering into small pieces, and appreciably increases volumes. quicklime time quenching is divided into bystrogasyaschuyusya (no more than 8 min), srednegasyaschuyusya (no more than 25 min) and medlennogasyaschuyusya (more than 25 minutes). slaked lime called pushonkoy. To all the particles of lime to fully repay, svezhegashenuyu lime kept before use is not at least two to three weeks, protecting it from drying out. It remains to fine particulate mass containing about 50% water - lime putty with a density of 1300-1400 kg/m3. The volume of the test in 2,5-3,5 times the amount originally taken lump lime. When drying of hydrated lime hardens not only due to evaporation of water, but also due to the interaction with carbon dioxide in the air. When hardening lime putty gives greater shrinkage. To prevent the shrinkage of lime mortar sand was added. hydraulic building lime used in the manufacture of mortars Masonry and plastering the wet operating conditions. In contrast to air quicker lime harden, eventually acquiring water resistance. Apply it and to obtain concrete of low grades and the production of lime-pozzolan of new and lime-slag binders. airy building lime is most frequently used in the manufacture of solutions designed for above-ground masonry. In the case of lime furnace is used to prepare solutions for laying foundations for furnaces, fireplaces and chimneys are indigenous. It is also used for masonry chimneys and headroom whitewash exterior surfaces of furnaces and chimneys. Lime in painting works serves not only as a pigment, but also as a binder in the preparation of some cements, pastes, putties, Kohler, etc. In these works use quicklime lump lime. The painting works apply lime only 1 class and in small quantities, so quenched it just before use. The higher activity of the lime and the sooner it is extinguished, the better its quality. Opacity lime 120 g/m2. From sifted through a sieve produce dry hydrated lime or lime less lime casein paints to color the facades. The advantage of lime - the possibility of painted limestone trains on raw surfaces in wet and cold rooms. The downside is that lime - caustic alkali, and therefore in the lime compositions can be used only alkali pigments. It should be borne in mind that some pigments are not alkali resistant to lime, and such pigments must be individually tested for resistance to lime. The quality of the lime. You need to check binding properties of the solution, consisting of one part lime and three parts sand. Fold a column of seven pinyanyh ordinary (full bodied red) bricks After 4 days the column gently lift up the top of the brick. If the column is destroyed, the lime is of good quality and suitable for construction work.