#threadedbar

We know that concrete is quite good in compression while steel is great in tension. Steel is also good in compression but due to its high strength, the cross section generally becomes small and the smaller the cross section more are the chances of buckling, while on the other hand concrete has low strength so we require larger cross sections and in doing so we overcome the buckling effects.

The fact which makes it possible to combine concrete and steel is that concrete contracts on setting in the air and if a threaded bar is embedded in a mass of wet concrete, it will be found that there is some amount of considerable force that is required to pull out when the concrete is set.if the steel section is in the form of a plate. When concrete is set, it will resist removal, yet it can be knocked off by sharp blows.

The concrete grips are still in first case while in the second it only adheres. The thing is, grip depends upon the strength of concrete used in the work as well as the perfection with which the concrete has been placed in a position, mixed, compacted and cured. It also depends upon the condition of the surface of the rod (whether it is smooth or rough).

Picture courtesy-Basalt rebar

Steel reinforcement bars are generally categorized into two reinforcement - primary and secondary reinforcement as given below. However there are also other minor uses.

Primary reinforcement : It refers to the steel which is employed to guarantee the resistance needed by the structure as a whole to support the design loads.

Secondary reinforcement : It also refers to distribution or thermal reinforcement and is employed for durability and aesthetic reasons, by providing enough localized resistance to limit cracking .

Threaded rebar is also employed to confer resistance to concentrated loads by providing enough localized resistance and stiffness for a load to spread through a wider area.

Steel rebars can also be used to hold other steel bars in the correct position to accommodate their loads.

Importance of concrete reinforcement in threaded bar

1) The coefficient of thermal expansion of concrete is almost similar to that of steel, due to differences in thermal expansion or contraction, large internal stresses are eliminated

2) In concrete conforms, cement sticks to the surface of steel after it gets hardened, permitting any stress to be transmitted efficiently between the two materials.Therefore, threaded steel bar are roughened or corrugated to further improve the cohesion or bond between the steel and concrete..

3) In the hardened cement paste, alkali chemical reaction forms a passivating layer on the steel surface to make it much resistant to corrosion.

For optimum results, reinforcement needs to have the following properties-

• Bond with concrete

• High relative strength

• Ductility

A type of metal fastener with threads that is cut into both the ends is called threaded steel bar. These bars almost resemble a screw but are longer and thicker. The diameter is the same along the complete length. These bars sometimes feature along the entire length and at times only at the either end. This depends upon the model that is been used. They are at times referred to as all-thread or sometimes simply stud. The threaded rebar is basically used to fasten wood or metal together. It acts as a pin that is used to connect two materials together. They are also used to stabilize structures by inserting them into concrete or wood during repair. The builders use threaded rods while constructing homes or different types of buildings. The metal workers are popularly known for the use of these threads when they build furniture or consumer goods. The threaded rods serve as the best method to hang sheet metal ducts or any other equipment.

Picture Courtesy-Technofaq

Uses of Threaded Steel Bar

The threaded steel bar is a versatile product that is used in all types of industries such as, electrical, agricultural and construction.

It is more popular as it eliminates the need for raw material. You will also not require threading equipment or any type of dies. These bars are produced with threads and is rolled under high pressure. This gives them greater strength therefore can be used along with standard nuts and washers.

The benefit with the bars is that they can be cut with the help of metal cutting hack saw or may be power band saw. This makes the nuts move easily over the threads.

If you use a rough saw, then you will require minimum debarring to clean the saw end. They are supplied in special lengths and grades.

The threaded steel bar are ideal for plant maintenance and industries more where corrosive conditions exist. It also requires high humidity which is found in agricultural and electrical components.

It is seen to be quite popular in plumbing and contractor fields. It is more needed in places where cleanliness and attractiveness is necessary.

It is greatly resistant to corrosion so is widely used in medical, maintenance and machinery.

What are the Material Used?

The threaded steel bar is basically a fastening bar in which a direction matters a lot. There are lot of options like right hand and left hand or both. The right hand threads are configured in such a way that it can be tightened in a clockwise direction. The left hand ones are not very common but suit the motor vibration. It is therefore necessary to mention the direction of the threaded rods. These bars are made of different materials such as:

Aluminium that is light and metallic element having a good thermal and electrical conductivity. It has very high reflectivity

Brass is another material that is used for threaded rods which has good strength. It has excellent properties like high-temperature ductility. Good conductivity and low magnetic permeability.

Copper is ductile and malleable. It is one of the best conductors of heat and electricity. Silicon bronze is another material that is popularly used in threaded rods.

Threaded steel bar is used because it is resistant to chemical and corrosion. It also has the advantage of high stress ratings.