Joint work of concrete and steel in reinforced concrete structures such as: reinforced concrete columns, floor slabs, reinforced concrete lintels, etc., only possible due to the adhesion of these materials. Simply put, without it, reinforced concrete will not be reinforced concrete.. Due to adhesion, steel reinforcement is able to withstand various tensile stresses and concrete loads. After reading this article, you will get acquainted with the joint work of these two materials..
Adhesion
In reinforced concrete structures, a strong connection between concrete and steel rods depends on many factors.. One of them is the surface adhesion of both materials.. Therefore, ribbed rods (fittings) have about 1,5 times the best grout fight, than smooth. Also desirable, so that the surface of the reinforcement is covered with a slight rust coating (picture below). At the same time, it must under no circumstances be:
- oily;
- dirty;
- crooked;
- covered with oil paint;
- covered with a thick layer of rust.
Concrete shrinkage also has a positive effect on adhesion., which arises in the course of its grasping. This phenomenon, causes cracks in concreted elements with a large area and relatively small thickness (eg, in floor screed), but in most cases it works well.. As a result of shrinkage, the rods seize in solution.
What else is worth knowing?
The adhesion of two materials increases with time and more in higher grade concretes. The quality of the mix matters a lot., and, primarily cement. Therefore, it is very important from which manufacturer the cement was purchased., from reliable or dubious.
Has a positive effect on grip:
- careful compaction of concrete during its placement (it is best to do this with a mechanical vibrator);
- as well as care in the first period of hardening.
It is also important to correctly place the reinforcement bars and the distance between them., ensuring proper strength.
Good adhesion of concrete and steel is also facilitated by, that both materials have a very similar coefficient of thermal expansion. Changes in temperature cause the same deformations in them, which do not affect the strength characteristics.
Output
Reinforced concrete is the strongest and safest structural material., of those used in construction. However, for that, for it to be, reinforcing bars must be located in structural elements in accordance with the project, and their area, respectively, densely filled with concrete. Of course, the latter must be made using quality cement.. From the video for this article you will learn about how the strength of a reinforced concrete structure is checked.
https://www.youtube.com/watch?v=RJlUi7aLjt0
