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cement

The cement-sand mixture: quality criteria

The cement-sand mixture - a versatile building material manufactured from Portland cement, sand and other additives that may be used depending on the purpose of the solution.

This type of mortar used in various jobs.

Her quality of quality of repair depends on the future premises.

Variety mixtures

With the development of construction technologies emergedmany varieties of cement-sand mixtures. Among the great variety of materials can be isolated sand-cement plaster, masonry mortars, and sand concrete. Cement plaster is used in the processing of concrete and masonry surfaces. It varies depending on the filler and is a kind of filler cement, with the difference that the form of plaster does not require additional processing after the application.

Masonry mortars are used for installationceramic blocks, bricks, various types of concrete, wooden structures, installing floor reinforcement, etc. This ready-to-use composition which provides laying building materials and durability of the whole structure. Peskobeton used in the manufacture of floors, having improved strength characteristics. It is done with the use of various chemical additives that improve the strength of the material, and it no longer resembles the fine-grained concrete in its construction.

Before applying the mixture carefully review the instructions for its cultivation and use.

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Choosing the right mix

The quality of the mixture depends on the usedas manufactured materials: sand, cement, chemical additives, and the ratio of these elements. The most successful proportion of binder and sand - 1: 3, ie, cement-lime basis with a ratio of 1: 1 is added 6 units of sand.

According to state standards, the mixture have different markingsdepending on the strength and stability, which is caused by the quality of sand. Mixture having a marking M-150, is able to withstand a load up to 150 kg / cm ^ 2, and M-300 - 300 kg / cm ^ 2, respectively. However, the choice of material is not necessary to be guided only by the parameters of strength, because the higher the index is, the less the ability of the surface to withstand physical stress, which occurs during the operation. As a consequence - increased the risk of cracks in the building construction. Moreover, the composition should be no extraneous additives and fillers other than those which are made from this material.

The quality of the material used are also influenced by the weather conditions, heterogeneity of the mixture at the wrong mixing and large differences in the thickness of the material on which deposition is performed.

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When determining the quality of the mixtures are also includedmobility of the material, its ability to retain water, peelability, the temperature at which the deposition is possible, and the average density of humidity. The ability of fluid retention in the mixtures should be at least 90%, and peelability do not have a factor greater than 10%. Application temperature should be at least 10-15 ° C, and the humidity should not exceed the figure of 0.1%.

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