Build Daily

Building Materials

August 12, 2017 18:08

Hydrated lime - master the construction chemicals

What kind of material and the production?

Hydrated Lime (pushonka) - this is an extremely fine white powder, which is obtained by liming, was originally a random lumps, it is usually at the plants using a small amount of water.When slaked lime is obtained, pushonka, its volume increases about two times.The bulk density of the obtained material was 400 kg / m³ and humidity - not more than 5%.

damping produce both during the construction of the facility, as well as centrally.With centralized quenching it is combined with outstanding wet-milling of particles, this process leads to improved quality and increased yield.

During construction, lime is usually quenched in special units, such a device is called a hydrator lime.There is loaded lump lime in volume 01.03 of the box height (average thickness thus is equal to 100 mm) as during blanking volume is doubled.

more quicklime, pushonka, filled once a sufficiently large volume of water, as it is extinguished very quickly that the original material is not too hot, and the water does not boil.But if the mixture is quenched slowly, the water is added in small portions, and are watching to notify, on the contrary, does not cooled.

Depending on the quality of lime from one of her kilograms on average out of 2 liters lime test.This figure is called the "exit test".Thus, lime hydrate - the only binder that can be converted into powder, not only by grinding but by quenching with water.

What is responsible for the properties of the fluff?

large specific surface of the particles of Ca (OH) 2 and their hydrophilic cause water retention capacity and good ductility test.After the slaked mix settles, it contains about half the particulate mass and half of the water.Each particle is surrounded by a layer of adsorbed water which plays the role of a lubricant which provides improved ductility and any mixtures thereof, which is used in our discussion of the object.

After quenching process is completed, the liquid mixture of lime paste is poured through the night in the vault, in which she is held up to that time, until I finally stopped quenching process.It usually takes about two weeks.That

dough which contains outstanding grain size of not more than half a millimeter, it is possible to freely use the work.But the large grains are dangerous because their number can enter the so-called "burnout" (perezhzhёnnye grain).Water in its content in the lime test is usually not standardized, often in a properly prepared test it in equal amounts from the main product.

What are the storage and maintenance of the nuances can be noted for the fluff?

It has been said that the lime putty is composed of a saturated aqueous solution of Ca (OH) 2 and fine particles of insoluble semi-finished product.When water evaporates from the solution, it becomes supersaturated, the crystals fall out of it, which increases the content of the solidified mass.

During this shrinkage reaction occurs solidifying system that, under certain conditions (which may be a mixture of solidification on a solid base, so called plaster layer) may be the cause cracking of the material.For this reason lime is used and with various fillers, for example, with the lime-sand mortar, or mixing with other binders to impart plasticity material.

That lime putty, which is protected from drying out, can long maintain its plasticity, "no" on their own setting processes.However, if the dough is still solidified, it can simply be moistened with water to bring it plasticity.After lime nevodostoykaya.

But at long curing process (ten years), known for its ability to acquire quite a powerful density and even small water resistance.This is due to the fact that it is outdoors reacts with carbon dioxide to form insoluble in water and fairly strong calcium carbonate material "becomes again" limestone.But it is a very long process, and as a result the full carbonation is still not happening.

That's such an interesting material in every sense is a powder lime, its application is very diverse.Air is used to make lime plaster mortars or as a self-binder or in admixture with cement.You can also see its use for the production of sand-lime bricks or silikatobetonnyh products.We do not do without the material and paint manufacturers.