Cement-sand Mixture: Quality Criteria

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Cement-sand Mixture: Quality Criteria
Cement-sand Mixture: Quality Criteria

Video: Cement-sand Mixture: Quality Criteria

Video: Cement-sand Mixture: Quality Criteria
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Cement-sand mixture is a universal building material made from Portland cement, sand and additional additives that can be used depending on the purpose of the mortar. This type of building mixture is used in various works. The quality of the repair of the future premises depends on its quality.

Cement-sand mixture: quality criteria
Cement-sand mixture: quality criteria

Varieties of mixtures

With the development of construction technologies, many varieties of cement-sand mixtures have arisen. Among the great variety of materials, one can distinguish cement-sand plasters, masonry mortars and sand concrete. Cement plaster is used in the treatment of concrete and brick surfaces. It differs depending on the size of the filler and is a type of cement putty, with the difference that this type of plaster does not need additional processing after application.

Masonry mortars are used to install ceramic blocks, bricks, various types of concrete, wooden structures, floor installation, reinforcement, etc. It is a ready-to-use compound that ensures the laying of building materials and the durability of the whole structure. Sand concrete is used in the manufacture of floors with increased strength characteristics. It is made with the use of various chemical additives to increase the strength of the material, and by its design it looks more like fine-grained concrete.

Before using the mixture, carefully read the instructions for its dilution and use.

Choosing the right mixture

The quality of the mixture largely depends on the materials used in its manufacture: sand, cement, chemical additives, as well as the ratio of all these elements. The most successful proportion of binder and sand is 1 to 3, i.e. on a cement-lime base with a ratio of 1 to 1, 6 units of sand are added.

According to GOST, the mixtures have different markings depending on the strength and stability, which is determined by the quality of the sand. The mixture, marked M-150, is capable of withstanding a load of up to 150 kg / cm ^ 2, and M-300 - 300 kg / cm ^ 2, respectively. However, when choosing a material, you should not be guided only by strength parameters, because the higher this indicator, the less the surface's ability to withstand the physical stress that occurs during operation. As a result, the risk of cracking in the building structure increases. Moreover, the composition should not contain any extraneous additives and fillers, except for those from which this material is made.

The quality of the material used is also influenced by weather conditions, inhomogeneity of the mixture due to improper mixing and large variations in the thickness of the material to be applied.

When determining the quality of mixtures, the mobility of the material, its ability to retain water, delamination, temperature at which application is possible, average density and humidity are also taken into account. The liquid retention capacity of mixtures must be at least 90%, and the stratification factor must be no more than 10%. The temperature of use should be at least 10-15 ° C, and the humidity should not exceed 0.1%.

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