Concrete strength class: types and features

26-04-2018

Building

Concrete is one of the most popular materials, which at the same time has just a huge number of different types. All of them have their own unique features and characteristics, suitable for use in certain conditions, which at the same time have their own labeling and are displayed in the title. However, when the conversation about the class of concrete strength, then you should pay attention to two components that have different indicators.

Amateur photo device destructive quality control samples of concrete

Types of marking

Для начала стоит отметить, что класс и марка бетона по прочности являются совершенно разными понятиями. Они определяются совершенно противоположными методами и характеризуются отличными друг от друга величинами. Однако сразу стоит сказать о том, что они имеют схожие характеристики и если образец имеет определенный класс прочности, то ему обычно соответствует конкретная марка (читайте также статью «Бетонная подушка: цели и способы сооружения»).

Research methods

First of all, it is necessary to say that the strength of concrete and the class of concrete are determined by pre-fabricated samples. Usually they have the shape of a cube with a side of 15 cm. It is in this form that the product is placed under a press in order to pass the necessary test.

There are techniques for testing compressive strength using cylindrical specimens, but they are less accurate because they imply complete destruction, not deformation.

It is worth noting that before exposing the samples to the apparatus, they are left for 28 days in order for the concrete to gain the necessary strength, walking maximum parameters, it will be able to dial only after 90 days. This means that the finished products of this material will also take on such qualities after this time.

It is important to mention that modern methods of obtaining such data using new equipment began to appear. However, they also cannot produce the correct result immediately after solidification, and their readings are practically no different from the proven methods.

Tip! It is necessary to know that the tests are made only on selected batches of concrete and their results will be available only after the product is cast. Therefore, it is worth buying a solution from proven manufacturers that have proven themselves in this market.

Class

This indicator is marked with the letter B. In this case, the classification of concrete by strength characterizes the material according to its resistance to compression. In fact, this is the impact of vertical loads.

Determination of compressive strength using a hydraulic press

This parameter is measured in kilograms per centimeter cubic. And these data make the label composition.
Typically, the installation manual contains these data, which are important in the distribution of the main loads at the design stage. At the same time, for standard construction with the erection of the foundation and screed, the class B15 is quite suitable, which can be considered universal.

Tip! You should always be interested in this parameter, since it can be considered the main one. It determines the scope and sometimes even the life.

Sample failure during compression testing

Brand

This indicator is denoted by the letter M. However, it is considered the very name of a particular type of material.

It is worth noting that the strength class of concrete according to GOST must correspond to a specific brand.. For example, W200 can usually withstand the same pressures as B15. In fact, they are always considered the same material.
Typically, the numbers after the brand mark indicate the quality of the cement composition, which naturally affects such a parameter as the price. However, one should not forget that this designation has a specific definition. The fact is that the figure after the letter M indicates how much MPa can withstand one cm square sample area without obvious damage.

At present, there are no ideally accurate methods for non-destructive control of these parameters, therefore, they prefer to trust the manufacturer, but to do control of each batch and, if they do not comply, dismantle the design

If the work is done by hand, the easiest way to order a certain brand than to specify the class. The fact is that the name is determined by it. At the same time, professional craftsmen recommend to discuss with the supplier all the properties of the material in order to achieve the maximum result.

Tip! Usually, designers know that almost all parameters specified in the specifications guarantee only 95% accuracy. At the same time, the declared data is not always true. Therefore, they make calculations, considering only two-thirds of the strength.

Concrete has always been used to create structures with increased strength, which means that you should not neglect such data, because people's lives may depend on it.

Conclusion

Ознакомившись с видео в этой статье можно получить дополнительные сведения о классификации этого изделия. Также если основываться на статье, которая приведена выше, стоит сделать вывод о том, что все данные в названии материала имеют определенное значение, определяющее технические характеристики продукции (см.также статью «Правильный ремонт трещин в бетоне»).