Lime-cement plaster is the most versatile tool that is used in construction and finishing works on any surfaces. And although in our time there is a huge selection of gypsum plasters, a lime-cement mixture is more often used. The choice is largely due to its affordable price, practicality and durability.
This compound has good adhesion to surfaces and is common for interior wall decoration in rooms with high humidity.
Composition and technical characteristics
Plaster is a mixture applied to walls to protect and level the surface.
Lime-cement mortar consists of cement, sand and lime in certain quantities.
The second no less significant component is lime, which must be slaked. Most of all, there is sand in the composition, so it must meet high requirements, namely: be clean, without any impurities and debris. And the ideal option here would be to use river coarse sand.
Note: Since the solution does not solidify very quickly, sometimes a plasticizer is added to it to speed up the process. For this purpose, a simple and inexpensive PVA glue can be used, which, moreover, will improve the quality of the solution.
The main advantage of plaster is environmental friendliness of the composition, safe use and the complete absence of unpleasant odors, thanks to which it can be used for finishing living quarters.
The popularity of this type of plaster is justified by the following facts:
Note: The cement mortar does not stick to the wood at all.
It is an excellent material for tiling in bathrooms. And also for rooms with pools, for outdoor use, etc.
In addition, this solution is considered the easiest to manufacture. It is prepared in the ratio: 1 part cement, 3 to 5 parts sand, 1 part lime.
To prepare the solution, a certain container is taken into which dry sand and cement are poured. Then, slaked lime diluted in water is added there. Everything mixes well, add water if necessary.
In general, in what proportions the mortar will be prepared depends on the type of construction and finishing work. The most common ratios are 1: 1: 6 - cement, lime, sand.
Cement needs a good and fresh grade 400 or 500.
Note: If the cement is stored for a long time in the wrong conditions, it loses its properties. For example, with long-term storage of the M500 brand, it becomes M450.
Sand must be sieved before use. If quicklime is taken, then it must first be extinguished. For what it is poured into a container and filled with water. In this case, one should not forget about safety precautions, because a large amount of thermal energy will be released during a chemical reaction.
With a layer thickness of about five millimeters, the consumption of this plaster will be seven kilograms or from five to six liters.
The layer thickness can be from five to thirty centimeters.
In practice, one fifty kilogram bag of cement will require forty kilograms of lime, five hundred and fifty kilograms of sand and one hundred liters of water.
First you need to prepare everything you need for this, namely a large capacious container in which the solution will be mixed. If you have a large scope of work, then it is better to use a concrete mixer, thanks to which the preparation will be faster. The solution is manually mixed using a conventional shovel or a special drill.
Be sure to observe the proportions, otherwise you may not achieve the desired qualities from the material.
There are some requirements in the manufacture of plaster:
- First, a lime mortar is made, for which 1 part of lime and 1 part of water are mixed. Everything is thoroughly mixed, impurities are removed;
- Then mix sand and cement 5: 1 until a uniform color;
- Add lime milk to the dry mixture and mix;
- To achieve the required more water is added to the consistency.
Note : It is not necessary to immediately prepare a large amount of solution. Expect about an hour of work.
Some people make the mistake of adding water in the process, seeing that the solution starts to set, and the work is not finished yet. It is categorically impossible to do this, because.characteristics will decrease and, accordingly, the strength of the finish.
When using PVA glue as a plasticizer, it must first be diluted in water. Typically, the glue is taken about fifty grams per bucket of cement.
It is not difficult to make a lime-cement composition yourself, but if you still decide to purchase a ready-made mixture, then pay attention to some nuances.
If you follow all the rules for preparing plaster from a cement-lime mixture, you can achieve the strength of your finish, because any deviations from technology and proportions can affect its quality.
( 1 grade, average 1 of 5 )
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