One of the most demanded materials at almost any construction site is fittings. Metal rods are necessary for strengthening the foundation, erecting monolithic walls or floors. In factories, high-quality reinforcement https://evraztrade.com/catalog/chernyj-prokat/armatura is used inside individual reinforced concrete elements ... The scope of use is so wide that it can not be limited only to the construction site. But how to indirectly determine the quality of the material if there is no specification for it.
Important external signs
Experienced builders know this information, as they received it while still studying in specialized educational institutions. But, you don't have to spend so much time and effort. The main difference can be determined by the simplest external signs. In total, there are three varieties that a builder will encounter at the installation site:
- Perfectly smooth metal bars are A-240 grade.
- The helix of the notches over the entire area corresponds to the A-300.
- If the notches become more complex and take on the shape of a herringbone, the grade has once again increased to A-400.
Important: each type has its main uses. For example, the highest grade is used primarily to strengthen the foundations of buildings, bridge piers and all structures that will face not only static but also dynamic loads. Only in this case will the reinforcement be able to increase the strength of the building.
Classroom innovations
With the increasing complexity of buildings with the advent of the new millennium, two more classes of reinforcement used have appeared. Outwardly, it does not differ in any way from the A-400, the same Christmas tree on the outside of the bar. In this case, responsible manufacturers adhere to the following generally accepted guidelines:
- special markings of the ends of the bars with a separate paint color;
- rolling marks that cannot be erased or faked;
- in caustic cases, a smooth profile may have a higher class than is customary in the notation.
Summing up the overall results, it is guaranteed to distinguish one type of rental class from another with 100% certainty based on external features. There is always the possibility of making a fatal mistake. It is for this reason that it is necessary to find suppliers of fittings who strictly adhere to the rules and do not mislead the end consumer. Only in this case you can not worry about the future reliability of the building being built.
