Why did you need this material?
The structures produced with the use of frost-resistant material are characterized by unusual durability and durability. Under conditions of annual temperature changes, concrete is subjected to numerous freezing and thawing. Under this influence, the structure of the material changes, which is why ordinary concrete often collapses.
Specialists carefully study the classification of concrete before buying the product and starting its use. In other words, frost resistance can be defined as the amount of freezing and thawing that concrete can withstand.
It is not necessary to save on the purchase of material, practice shows that the use of frost-resistant composition allows to extend the life of the building for several years. In some cases, the implementation of the project in life without the purchase of appropriate concrete becomes completely impossible.
Properties of frost-resistant concrete
This type of concrete perfectly tolerates weather changes, does not change shape and does not crumble, which makes it possible to use it not only in areas with lower temperatures, but also in building buildings in places with high humidity.
The composition of the frost-resistant version includes: water, cement, sand and filler. Experts insist that in its manufacture only high-quality elements are used, even a small handful of poorly cleaned rubble can reduce to "no" all the positive qualities of the material.
In the manufacture of frost-resistant concrete, sand is used in several stages, this preparation explains the increased cost of the building material.
The main indicator of the quality of the concrete mix is the concrete grade for frost resistance , it is taken into account in the manufacture and approval. Each brand has special numbers, for example, 100, 200 and so on, they denote the compressive strength of kg / cm2.
Determination and verification of concrete grade
The concrete grade for frost resistance is the maximum number of freezing and thawing cycles that a sample can pass. At the same time, the reduction in strength becomes unacceptable, it can not exceed 5% in comparison with samples not exposed to low temperatures.
To date, there are installed brands for frost resistance: 50, 75, 100, 150, 200, 300, 400, 500 with the prefix "F".It should be correctly understood that the figures do not show the possibility of concrete curing at negative temperatures. For this feature special substances - additives and additives meet.
The quality of the concrete in question is directly affected by the way of laying and compliance with the requirements at the stage of making the composition. Quality frost-resistant concrete easily passes the strength tests, and the test results fully comply with the statements of the manufacturers.
Qualitative examination of the material is mandatory before the start of construction, there are special recommendations and action algorithms that ensure the receipt of correct data. To carry out the experiment it is required to make 2 forms( 2 cubes) in which the material will be poured.
concrete frost resistance is determined in accordance with GOST.Samples are placed in water for 24 hours, while only one third of the cube is immersed in the liquid. At the end of the day, the water level is raised to two-thirds and left for a day. On the third day, under the water, the whole sample is hidden, it is necessary that the liquid surround it from all sides not less than 2 centimeters.
After that, the concrete is left in the water for 2 days. Further, the samples are tested for compression, thus obtaining all the necessary information and checking the data with the claimed data.