REBAR
Rebar and its applications
Rebar is a steel strip or mesh of steel wire used as a tensile tool in reinforced concrete and reinforced masonry structures. And used to help concrete under tension. Concrete is strong under pressure, but has poor tensile strength. Rebar significantly increases the tensile strength of the structure. The surface of the rebar is often “deformed” with ribs, prongs or indentations for better bonding. Build with concrete and reduce the risk of slipping.
Mechanical properties of rebars in structures
Rebar significantly increases the strength of the structure, especially its tensile strength, because concrete is inherently sufficiently resistant to compressive forces, but has little resistance to tensile forces, and these forces can leave it or Even crush. As a result, using concrete without rebar has little benefit and effect on the strength of the structure.
It was not until 1800 that Joseph Lewis discovered that adding steel rods to concrete could increase its tensile strength, which eventually led to the construction of concrete structures that resisted both tensile forces and They have considerable resistance and strength against compressive forces.
Then, in 1878, the first standards for steel rods in the steel industry were established, and before that, rebars were produced without a specific standard.
Rebar standards
The American Society for Testing and Materials (ASTM) has developed a standard identification rule that all rebars must follow:
- A number must indicate the size of the bar.
- Bar degree ID must be mentioned: This grade indicates the performance resistance of the bar.
- A symbol must be inserted to identify the constructor who rolled the rod: This is usually a letter or a simple symbol.
Stahl table is one of the most widely used sources for examining rebars with different standards. This table contains information for the construction industry listing the various rebar standards set by the German Standards Institute.
Types of rebars
There are different types of rebars, each of which is selected according to the structural conditions. Rods are classified according to various factors, such as whether they are ribbed or not, or how strong they are.