Frost resistance of concrete - take care about the safety of your fortress

Why there was a need for such material?

manufactured using cold-resistant construction material differ unusual resistance and durability.In terms of annual changes in temperature the concrete is exposed to numerous freezing and thawing.Under the influence of these changes in the structure of the material, which is why conventional concrete is often destroyed.

experts scrutinize the classification of concrete before purchase goods and start using it.In other words, frost can be defined as the number of freezing and thawing, which can withstand the concrete.

not necessary to save on the purchase of material, practice shows that the use of cold-resistant structure can increase the life of the building for a few years.In some cases, the project embodied in the life without a corresponding purchase of concrete becomes completely impossible.

Properties frost-resistant concrete

This type of concrete perfectly transfers the weather changes, does not change form and does not crumble, which makes it possible to use it not only in areas with lower temperatures, but also in the construction of buildings in areas of high humidity.

The composition frost options include: water, cement, sand and filler.Experts insist that, in its manufacture only high quality items, even a small handful of poorly cleared of rubble may be reduced to "no" all the positive qualities of the material.

In the manufacture of frost-resistant concrete using purified sand in several stages, namely such training explains the increased cost of construction materials.

main indicator of the quality of the concrete mix - grade of concrete frost resistance , it is taken into account in making his statement.Each brand has special numbers, such as 100, 200 and so on, they represent the compressive strength kg / cm2.

Identification and verification of concrete brand concrete

Mark on frost resistance - the maximum number of cycles of freezing and thawing, which may take a sample.This reduction in strength becomes invalid, it shall not exceed 5% in comparison with the samples unaffected by low temperatures.

To date, there are established brands in hardiness: 50, 75, 100, 150, 200, 300, 400, 500 with the prefix «F».It is correct to understand that the numbers do not show the possibility of concrete to harden at low temperatures.For this feature meet the special substances - supplements and additives.

The quality of the considered concrete directly affects the way of laying and compliance at the manufacturing stage composition.Quality concrete frost easily tested for durability, and the test results fully correspond to the manufacturer.

Qualitative examination of the material is required prior to construction, there are specific guidelines and algorithms of actions to ensure receipt of the correct data.For the experiment is required to produce 2 forms (2 cubes), in which the material will be poured.

very definition of concrete frost carried out in accordance with GOST.Samples were placed in water for 24 hours while immersed in the liquid only one third of the cube.At the end of day the water level is raised to two-thirds and leave at night.On the third day under water to hide the entire sample, it is necessary that the liquid was surrounded on all sides by at least 2 centimeters.

Thereafter, concrete is left in water for 2 days.The samples were tested for compression, thus obtaining all the necessary information and data checking statements.