Constructions, bridges and flyovers, dams, thermal and hydel power plants, industrial structures, high-rise buildings, and subterranean platforms in metro and fast transportation systems are some of the general places TMT bars are commonly used. TMT Bars are thermo-mechanically treated for high yield strength using world-leading temp core-based technology.

Why can’t we simply pour concrete? What’s the role of TMT rebar?

‘Reinforced’ concrete is currently used in almost every structure. The compressive strength of concrete is great (the ability to withstand loads that tend to compress). Concrete, on the other hand, requires steel reinforcement due to its poor tensile strength (ability to withstand elongating loads) and ductility (ability to deform under forces that tend to elongate). Steel, on the other hand, is extremely tensile and ductile. Steel and concrete, when used together, have the potential to withstand all types of forces that can be applied to a structure. Furthermore, when the temperature rises, both steel and concrete expand similarly. This makes them an extremely attractive pair.

Consider steel and concrete to be close companions that compensate for one other’s flaws! Simultaneously, they share characteristics that make them an excellent match!

Why is it called TMT rebar?

Because of the manufacturing process, the best quality TMT bar in Bihar is known as Thermo Mechanically Treated rebars. Water is used to cool hot rolled steel. The core cools faster than the surrounding surface. The outer surface becomes hard and robust as a result of rapid cooling. The core, on the other hand, stays soft and ductile due to the slower cooling rate. The steel is also more corrosion resistant as a result of the manufacturing process.

TMT rebars are Fe550D grade of iron. What exactly does that imply?

The yield stress in N/mm2 is denoted by the number 550. This is the point at which steel begins to ‘give’ or deform. When a force of less than 550 N/mm2 is applied, the TMT rebar will revert to its original shape after the force is withdrawn. To put the great tensile strength of steel into perspective, 550 N/mm2 is the ground pressure imposed by nearly 2,200 elephants stacked on top of each other! The strength of Steel is extremely high tensile.

The letter ‘D’ stands for Ductility, when it comes to the 550D grade, failure usually occurs at 625 N/mm2 or higher. In intense loading circumstances, such as earthquakes, higher ductility is advantageous.

TMT rebar has ribs. Why aren’t they smooth, shiny surfaces?

The ribs on TMT bars from the best saria suppliers in Bihar help the rebar grasp the concrete well. Because of the grip, the concrete and steel become composite materials. After setting, the TMT rods will be difficult to remove from the concrete.

TMT bars’ characteristics

• Withstands earthquakes
• Increased tensile strength and ductility
• Thermal resistance is high.
• Improved adaptability
• Weldability is excellent, with no loss of strength at welded joints.
• Cost-efficient

How are Shyam Steel TMT rebars better than other TMT rebars?

Shyam Steel TMT Bar Manufacturers are frequently referred to as a commodity, with all brands in the market being equivalent. They prioritize research & development behind the scenes, paying close attention to every element of the manufacturing process. 

Shyam Steel TMT being one of the top iron saria suppliers in Bihar assures that every piece of TMT rebar not only meets but also surpasses the set criteria by a significant margin.

The percentage of alloying elements such as sulphur, phosphorus, and manganese is critical for TMT rebar performance. Many construction failures have been documented as a result of the percentage of these alloying elements not complying with industry standards. However, controlling the proportion of these alloying components in the manufacturing process might be challenging at times. Some businesses even make concessions on costly alloying materials such as manganese. 

The best place to buy your TMT material in Bihar is at https://shyamsteel.com/products/tmt-rebars/. Place your order today.

So, if you are looking to keep all these materials safely and in the best shape to use them this segment will be helpful. Here you’ll learn the 5 best tips that will be simple yet effective. Implementing them all in the right way will help you to handle and store all the construction materials properly.

Let’s talk about these top 5 tips:

1. Have Trained Workers on the Site

As we discussed earlier, there are countless risks involved when it comes to material handling and storing, and few of such materials can turn out to be harmful to your workers. However, the best practices in such cases would be to have trained workers who know the best practices to avoid such incidents to take place keeping in mind the dangers involved.

So, before getting the construction process to see its first day, ensure you ask all your workers to go through the safety training programs to maintain their safety. Workers equipped with the best measures and knowledge will be best to be around other workers and construction sites.

2. Same Materials Should be Stored Together

Various construction materials and chemicals are prone to reach each other once they are stored together. For example, few highly flammable materials can react to each other instantly. Such a storage system poses a lot of threats to workers and materials all together.

Once a fire takes place in construction materials in the storage area, it will increase the overall budget of the construction project and the owner would have to increase the same to go out of the shop and replace the lost construction materials. Hence, ensure that such materials or chemicals are always stored in different chambers or storage sections.

3. Choosing the Right Storage Space

In the places like India, different states witness variable weather conditions and the engineers similarly plan the project construction. Construction materials can also be affected in such varying weather conditions. To tackle the same and retain the quality of the materials, store all building construction materials in Assam concerning the favourable room temperature condition and keep them covered until used. Additionally, you can go ahead to take an extra step ensuring no construction materials are placed directly on the bare ground. This will help these materials to steer clear from moisture, maintaining their true quality.

4. Consider Storage Weight limits

Construction material comes with a dedicated storage limit that can be seen indicated on its outer cover. Not following the same can be harmful to all your workers under easy breakage and fall. The materials can also fall and break making you be the victim of unfortunate conditions.

5. Don’t Compromise on the Security

Construction materials aren’t inexpensive and in case of theft or loss, you would be looking at spending a huge sum of money to replace them. If you think your construction site looks unsafe because of thieves or intruders, consider bringing uptight security while keeping them stored in dedicated sections. In case the conditions ask you to leave or store the construction materials on the job site itself, bring in an additional layer of security despite tight security. Invest in installing multiple security cameras like CCTV cameras and always take a daily count before the starting of the day and at the end of it.

These steel billets are formed straight during the casting process and are considered to be the gentlest & highly moldable structure available at the top construction companies in Arunachal Pradeshand are also the least expensive. These are fundamentally the usual product of the assembling procedure for TMT steel bars. Its formation comes out by liquefying wipe iron & emptying them into throwing machines & cooling them. Their basic usage includes transformation to complete items such as sheets, chunks, bars, or poles at the company’s parent processing plant. They are also sold to various other industries for re-rolling or to transform into completed products. Steel billets aren’t used as an immediate item by an individual purchaser however it is used as a crude material for manufacturing processes.

Let’s take a look at the various applications of steel billets:

• Utilized in further process of metal casting
• Uses as a crude material or feedstock in rolling, expulsion, fashioning along with other metal preparing applications
• Used for making poles, bars or areas dedicatedly shapes
• A great deal of its usage comes in forge or machine shops for the production of machining parts, components and engineering
• Applicable for machined components, fasteners, precision components, turned components, milled components and parts
• They are widely used in development construction, electrical, gadgets, car, waterworks, aviation, producing, transport, clinical, nourishment along with various other progressively modern sectors.

Pros of Steel billets:

• Cost-effective in small quantities
• Provides high-degree of precision
• Minute lead times
• Strong structural parts

They are produced straight away from regular casting or extrusion or indirectly from hot rolling an ingot or bloom. They are also created employing profile drawing or rolling. They also have specific attributes as contrasted and for now, furnished steel bars and products. All the steel billets have a specific grain structure that allows the metal to be handled all the more unpredictably. They are also popular for showcasing a great deal of pliability & flexibility, especially during the varying temperatures witnessed during forming & trim. Steel bars are formed when steel billets are collapse constantly into long wire-like structures.

Natural disasters and susceptible calamities are directly linked in India and it is to blame for the rising frequency of natural catastrophes due to its geo-climatic characteristics. Today, India is experiencing urban constructions and skyscrapers at rapid speed with beneficial features such as stunning architects, multifarious designs that are relevant to the user’s regime and demands. People are concerned about these structures because they are so vulnerable to natural disasters. To answer that, Shyam Steel, the best TMT saria in Manipur, comes with the best quality TMT bars’ that provide stability and strength to urban structures and skyscrapers to withstand nature’s wrath.

• What is TMT bar?

TMT (Thermo Mechanical Treatment) bar is a type of steel bar that goes through a thermo-mechanical procedure to become a high-strength reinforcing bar. It creates a heat slant between the new inner core and the colder surface, resulting in ineffectiveness. These are the specifications used to give TMT bars a strong outer layer for durability and a soft inner core for greater ductile strength. 

These methods, which are conducted by the suppliers of the TMT material in Manipur, help to make them corrosion resistant and have a variety of other useful features. TMT bars are commonly employed in the construction of buildings or dams, and they aid in the protection of these structures against natural calamities.

Let’s shed some light on how these high-quality TMT bars protect structures from natural disasters?

1. Fire

Amongst the various types of natural & household disasters, fire is the most dangerous and can cause the most destruction. They mostly cause damage to the construction and stability of the building. One of the most important concerns for engineers and builders is the structure’s fire safety. TMT rods have a high thermal capacity, allowing them to withstand temperatures between 450 and 600 degrees Celsius. Shyam Steel TMT bars have a strong resistance allowing your structures to withstand intense fire.

2. Storms 

TMT bars are noted for their tremendous strength and structural stability during storms. Strong winds can cause structural damage to structures and are a constant hazard during the construction process. Strong winds caused by hurricanes and storms cause property damage, and TMT Bars provide you with a better chance of erecting stronger structures that can withstand the harm.

3. Cyclones 

Strong winds such as tornadoes, hurricanes, and cyclones may wreak havoc on structures and buildings. These can cause damage to buildings if the materials and techniques utilized are inadequate.

4. Rain

Floods can harm structures by causing intense wear and tear as well as corrosion from extended exposure to water. In humid settings, such as coastal locations and marine structures, TMT Bars provide protection. TMT Bars have a strong corrosion resistance due to the manufacturing procedures used, making them excellent for home construction because they do not require any additional cold twisting to make them corrosion resistant. Shyam Steel is the best TMT saria manufacturer that provides your structure with strong stability, allowing it to withstand storms cyclones and rain.

5. Earthquakes

TMT bars are resistant to earthquakes because of their pearlite core, which provides high ductility and high fatigue resistance to withstand dynamic loading. This helps buildings absorb the vibration induced by earthquakes to a considerable extent, minimizing damage. TMT rods are commonly employed in the construction of structures in earthquake-prone areas because earthquakes inflict massive loss of property and disaster. Shyam Steel – the best construction material company in Manipursupplies TMT bars that have high ductility and high fatigue resistance, allowing your structures to withstand intense earthquakes.

Takeaway

Whether you’re building your own house or overseeing a multimillion-dollar construction project, your security should never be jeopardized. To ensure that, TMT bars are the greatest option available in today’s globe especially in India, to withstand natural disasters. Shyam Steel TMT Bars come with features like corrosion-resistant, earthquake-resistant, and these are high-quality steel TMT Bars.

Shyam Steel TMT is a remarkable TMT brand since it is formidable in all aspects for construction needs. The combination of cutting-edge technologies and a stringent quality control process that adheres to worldwide industry standards results in exceptional strength steel rods that are priced competitively. 

Invest in your safety and prepare for natural disasters by using Shyam Steel TMT bars to build a robust structure.

Artificial Intelligence is changing the construction world in every possible way during the pandemic.

Monitoring Construction Sites with AI Software

During lockdown, many projects are doing well and the team leaders of the project are constantly looking out for reliable sources to maintain the safety of their workforce. So, with the help of artificial intelligence (AI) a modern automatic video observation setup was made to monitor the safety of the workers.

Enhance Collaboration with Augmented Reality (AR)

With AR, architects are even ready to see their structure plans in the specific area wherein it will be assembled. This permit engineers to draw their plans inside the assigned geology and gives them information about the site that wasn’t already reachable to them. The trend of Augmented Reality is allowing construction workforce to work remotely and submit projects on time.

Become Paperless

The idea of a paperless corporate life was buzzing around for a long period of time, but not many companies have achieved the desired result. Nowadays, to maximize contactless communication, employees prefer digital platforms more than paper in the construction business.

As most of the people are working from home to avoid social gatherings, it would not be incorrect to say that they are finding easier in working through AI platforms rather than paperwork.

Constructing Smart Cities

Due to economic slowdown caused by pandemic, the idea of constructing smart cities has become a dream for some countries. The engineers are using latest technology tools to respond to COVID-19 with the function of data analytics, artificial intelligence and sensor technologies.

Cyber Security Method

Nowadays, as the construction industry is moving towards digital technology, requirement for cyber security is also rising exponentially. Due to pandemic, workforces are operating remotely on a less secure wireless connection so the proper cyber security is very much needed to protect the data and other information’s.

Digital Construction

Construction associations that are adequately gone through considerable advanced change thought that it was much simpler to balance between social distancing and work-from-home circumstances. This is applicable for both off-site and on location work because of the accessibility of linked construction tech arrangements, utilizing which teams can communicate up rapidly. Such arrangements allow all construction groups to work more productively and successfully.

Post Construction Support

After the construction gets completed building managers can collect information about the structure through drones, sensors, AI powered algorithms and other wireless technologies.  Managers can track the performance of a bridge, building, roads and everything that are on progress. This implies AI can be utilized to monitor issues, decide when precaution should be taken, or even direct human conduct for ideal security and safety.

Future of AI in Construction Industry

In modern buildings, AI can be used to map the way for plumbing and electrical systems. Construction Company are using AI to develop worksite safety, track the real time performance of machinery, objects and workers as well on the site and alert controller for construction errors, productivity issues and safety issues.

In spite of the forecasts of huge unemployment, AI is probably not going to change the human labour force. However, it will adjust plan of actions in the construction business, reduce mistakes, lower the chances of site injuries, and make building tasks more proficient.

They are either called weighty machines, heavy vehicles or trucks, engineering and construction equipment or heavy hydraulics.

Proper selection of equipment leads to good economy, safety, speed, quality and timely delivery of the project. For all construction process selecting the proper equipment is very essential.

Types of Construction Equipment

There are many types of construction equipment used, which are as follows:

1. Construction Vehicles

2. Equipment for Earth Moving

3. Equipment for Material Handling

4. Equipment for handling other Construction Materials

1. Construction Vehicles

Trailer

A trailer is an motorless vehicle dragged by a controlled vehicle. It is generally utilized for the transport of products and materials including concrete, steel, TMT Bar, rods etc.

Dumper

Used for the purpose of unloading bulk materials frequently on construction locations. Unloaders are recognized from dump trucks by setup.

Tippers

A dump truck, referred to likewise as an unloader truck or tipper truck, is utilized for carrying dumps from construction sites. A tipper is a heavy truck structure fitted with an open-top body, utilized for carrying pile of concrete, crushed stone, soil and other form of materials to and from building locations.

2. Equipment for Earth Moving

To carry out different sorts of digging work like excavation, earthmoving equipment are used. Every earthmoving equipment have their special applications and used mainly for constructing, repairing, demolition.

Excavators

These are famous earth-moving vehicles that highlight a vessel, arm, revolving cab, and moving tracks. These parts give prevalent force to dig and versatility, letting this weighty machine to carry out several actions, from burrowing breaking holes to digging.

Loaders

Loaders are heavy construction machine which used to load or move materials such as demolition debris, recycled material, dirt, gravel, wood logs, snow, rocks etc into a different machinery as a conveyor belt, garbage truck or railroad car.

Bulldozers

A bulldozer is a huge and weighty farm vehicle furnished with a large metal plate used to push huge amounts of sand, soil, stone blocks, or other such material during excavation or construction work and usually equipped at the back with a claw like tool to relax thickly crushed materials.

3. Equipment for Material Handling

Crane

A crane is a machine which is used to lift and lower materials and to move them parallelly. It is designed with an elevator rope, strong cable or chains, and bundles. It is basically utilized for lifting overweight things like TMT bar, steel, blocks, etc and moving them to different places.

Forklift

It is designed in the 20^th century and it is basically an industrial truck, utilized to transfer and lift things within short distances.

4. Other Construction Materials

Conveyer system give a proficient, dependable, profitable and lower-hazard strategy for eliminating garbage and ruin from digging removal sites.

Concrete Mixer

A cement mixer is a machine that regularly combines concrete, like sand or rock, and water to shape concrete.

An ordinary mixer utilizes a spinning drum to blend the components.

Road Roller

A road roller is a compactor-type designing vehicle used to reduced soil, rock, cement, or black-top in the construction of highways and foundations.

1. Ductility
2. Strength
3. Flexibility
4. Longevity
5. Binding

But, at the most one should understand the process and formation of the TOR and TMT Steel rebars which have been explained below:

Manufacturing Process and Formation

TOR Rebars

Predictably, rebars are formed by two separate methods of production. In the initial type, the bars holding ribs at their surface are hot rolled from steel billets along with definite chemical composition to achieve desired strength.

The second one is produced by “Cold Working Process” that includes the stretching and twisting of the Mild Steel (MS) bar of 250 MPa in a repeated manner. Rebars which formed from this are Cold Twisted Deformed (CTD) rebars. On stacking, steel will follow a straight versatile way like that of unique gentle steel till it arrives at where dumping begins; which likewise turns into another “yield point”. The necessary expansion in yield strength is accomplished by suitable determination of dumping point. These rebars are industrially produced under the trademark of “TOR Steel”. This is broadly produced in our country.

TMT Rebars

TMT means “Thermo Mechanically Treated”steel rebars are delivered by applying most recent cutting-edge innovations coming about in undeniably more unrivalled properties than ordinary CTD/TOR rebars.

Thermo mechanical treatment is a high-level heat treatment measure in which hot bars emerging from last moving mill stand are quickly cooled down by an unusual water splash. Quick abolishing gives concentrated cooling that converts surface layer of the bar to a solidified design called “Martensite” and with hot center; Austenite.

The rebars cross‐section with a temperature slope is then permitted to cool in encompassing conditions called “Self-treating”. Upto this stage temperature of center is higher than that of the surface. Warmth is then permitted to move from the center to the surface bringing a hardening surface that gives external surface a strength and durability while center is transformed into a “Soft Ferrite Pearlite”.

Extraordinary Heat Treatment of Quenching and Tempering subsequently changes the design of material to a composite construction of pliable inward center having a construction of “Ferrite Pearlite” and with solid, extreme external surface of “Tempered Martensite”.

This is the manner by which TMT rebars give the novel mix of solidarity and malleability.

Ductility

Ductility is a capability of any fabric / structural factor to deform, except collapse, even after accomplishing the failure load. This property protects the rupture / structural fall down or prolongs the rupture / cave in process. Materials with no ductility are brittle ones. Also, Structures with no ductility give way nearly immediately. It can’t face up to the failure load except surprising collapse. Elongation of a metal rebar refers to capability to elongate earlier than failure.

Strength

Obviously, TMT 500 has greater price of yield energy of 500 MPa to that of the TOR 415 which has yield energy of 415 MPa only. For a utilized load on the structural element, definitely, use of TMT 500 grade consequences in lower metal quantity. It has been determined that use of TOR 415 grade nearly will increase the metal extent through 20 percent to that of the TMT 500 grade.

Flexibility

You can get different shapes of rebars if the rebars have easy internal core. TOR steel has also established track of its flexibility. At the end, good flexibility will help you to give your steel rebars the exact shape which you want.

Longevity

The key parameter in durability of structure is resistance which helps against the rust of the steel rebars. The chemical composition plays a big role in resistance of these TMT rebars. The good quality concrete is a requirement for the rust resistance structure.

Binding

The rebar which consist of low carbon material are highly weldable. To impart strength in rebars, proper amount of carbon distribution is extremely important.

Conclusion

As we can see from the above declaration that TMT Rebars which are produced from the newest technology are providing far improved qualities than standard TOR. It also helps to save almost 20 percent of steel cost. And also, the process of manufacturing TMT are more advanced and classier that changes the nuclear structure to give more strength as well as proper ductility as required.

You need to make sure that the foundation of your building is strong. For the selection of the perfect TMT bar is very important because it will hold the concrete together.

While building new home one should understand the various phases of house development from digging to completing. It is important in the event that you need to guarantee you are in a state of synchronization with the construction process. In this article we will explore the phases of home construction with the best TMT bar product in India – from the beginning of house development to the moment you get the new home keys. Below are some phases of house building:

• Location Research

The beginning of house construction starts with the preparation and excavation of the place. You may need to complete some grounding off or levelling at the beginning if necessary. When the site is clear, ready and levelled, you and the constructor must outline the floor plan of the location. This will be the first occasion when you experience the floor plan in all practicality instead of on paper – a genuinely awesome moment!

• Floor Concrete

The next phase of house development will be to introduce the main solid floor chunk. The base will be dug, confined and emptied according to your architects’ confirmations. When the formations and plumbing are organized the main solid floor section will be poured.

• Shaping the Roof & Floor Structure

After the piece of concrete is restored, work will start on the main portion of the house, this is quite possibly the most energizing point of house building. In India there are wide range of techniques for construction available and this stage will change depending upon your specific strategy for home construction. In this stage, the selection of the best TMT bar, brick, steel, timber, concrete and so on, for your construction is very important.

• Ceiling

When the construction of the ceiling and wall structure is finished the rooftop will be fitted and made waterproof.

• Outer Textures

Depending upon your kind of house construction strategy, the outside wall will now be done. If your home has a solid wall such as concrete, brick or block then this will naturally involve in painting and execution the outer walls. On the other hand, if you have a light outer design, for example, wood or steel this will included covering and protecting the construction with your selected material like wooden boards. Also check that the constructor has used the best TMT bar or not as per the contract in the beginning of the project, as this will be the root/pillar of your building.

• Doors and Windows

Since important heavy work has completed, now it is secure to install the doors and windows. This makes the structure completely watertight and protected from the components which can cause problem in the construction. Now, the builders can concentrate on the inner areas of the building which follows work like plumbing, electrical and finishing up.

• Uneven fittings

Plumbers and electricians will install the necessary pipelines and electric wires. The construction will be treated as uneven because none of the wires and cables will be connected with the live sources until the expert do. When the expert will come they will connect the respective switches, electrical plugs and lights, wires and every require things but for now, they will leave the pipes and wires extended from walls, which will be finished later.

• Internal Fitting

Since the pipes and wires are installed, work will start on the non-constructional interior walls and floor tiles. This will contain plastering, tiling, painting and the fitting of finished floors.

• Wooden work

During this phase of home construction carpenter will work for the fitting of any in-built furniture like kitchen cupboards and room closets. The things like door and window borders are also designed at this time.

• Constructive Execution & Delivery

We are currently at the point of completion where your home is basically finished. You will visit the property with the constructor and make a last review to ensure everything has been worked as agreed and the constructor has finished work as agreed in the contract. This is your last opportunity to observe any issues and have them corrected by the builder.

All the completion, this is the time which you are waiting for! This is the second you have been hanging tight for! After correcting all your issues, the constructor will hand over the keys to you.

Always remember that the material and method used for the building construction or the builders you hire may affect the order of the construction. So, always choose very carefully. The above are very common stages of construction. We hope this blog will help you understand the process of home construction from digging up to finishing.

In order to ensure the quality of TMT Bar there are certain tests by which you can ensue it. TMT Bars comes in different grades such as Fe 415, Fe 500, Fe 550, Fe 600, the numbers denotes the yield strength.

Which Grade of TMT Bar is best for Construction?

TMT Bars needs to have the perfect combination between strength & flexibility. As per IS Standards Fe 500d Grade steel reinforcement bars has the perfect combination of strength & flexibility. It is mostly recommended for all type of construction purposes.

However to determine the strength & elongation certain number of tests are performed to ensure its quality. The tests are as follows

• Tensile Test
• Yield Stress Test
• Bend & Rebend Test
• Chemical Analysis Test

What is Tensile Test in TMT Bar?

To measure the strength of reinforcement bars Universal Testing Machine (UTM) is used. Upto 32 mm capacity of TMT Bars can be tested without machine as per IS 1786 and above which need to be tested with it.

Calculation

Determine the cross section area of TMT Re-bar.

• Weight of the Re-bar of 500mm = X mm (b) Length of the Re-bar (Area in mm2 = Weight / Length x 0.00785)

IS: 1786 / 2008 (Clause 6.3.1)

Ultimate Tensile Strength =        

What is Yield Stress Test in TMT Bar?

A Material can take stress upto which level? At which level it will begin to deform plastically? These are factors can be determined during Yield Stress Test/0.2% Proof Stress. Until the material reaches to the yield point it will deform elastically and return to its original shape when the applied stress is removed.

The standard procedure is to project a line parallel to the initial elastic region starting at 0.002 strains. The 0.002 strain point is often referred to as the 0.2% offset strain point.

The behavior of the material can be broadly classified into two categories, brittle and ductile. Steel and aluminum usually fail in the class of ductile materials. Glass and cast iron fall in the class of brittle materials. The two categories can be distinguished by comparing the stress-strain curve.

What is Bend & Rebend Test in TMT Bar?

In many cases you can find that TMT Bars are getting deformed. It happens because of wrong handling of the materials. So, one must be careful while bending and re-bending the TMT at construction sites. When bending or re-bending is done at a construction site, it is to be ensured that the bend radii are not formed below the prescribed minimum sizes in the relevant standards. Incorrect bending can severely affect the performance of steel reinforcement in service.

Important Points to be noted while bending TMT Bars

• Bending should be done gradually & slowly. It needs not to be vibrated while performing it.
• Minimum bend diameters have been established for different bar sizes.
• Bending with pipe of hammer should be strictly prohibited
• TMT Bars should not have dirt/mud in it.

It is essential to select TMT Bars that are manufactured at ISP’s where advanced quenching technologies are used while manufactured. Better tensile strength & elongation comes during the quenching. So BIS Licenses, World Class Quenching Technology such as Thermex these are the main criteria to select the best quality TMT Bars.

Bend Test

The bend test consists of bending a test sample of TMT Re-bar through plastic deformation by applying a load against a suitable mandrel until a specified angle (180 degree) of bend is reached. Depending on the requirements of the material standard such as IS 1786/2008; it should be parallel at a specified distance, an insert is used to control this distance. Test is usually carried out at room temperature and the bending arrangement with two supports (S1 & S2) and a Mandrel (M) has been shown below.

The length (L1) of the test piece depends on the diameter (Φ) of the Re-bar and the Test equipment used. If the distance (L2) between the supports is not specified, then L2 can be calculated as follows:

L2 = Md + 3Φ [Md = Mandrel Diameter]

 The mandrel diameter used for different grades of TMT Re-bar for Bend test are given below as per IS 1786-2008

* Φ is the diameter in mm of the test sample

* : The sample shall be considered to have passed the test if there is no rupture or crack visible at the bend (tension zone) portion to a person of normal vision.

Re Bend Test

This test is designed to measure the effect of strain ageing on the steel. Strain ageing is an embrittlement effect, which occurs after cold deformation, by the diffusion of nitrogen in the steel. The risk of fracture on bending is increased as the temperature is decreased, because these steels have decreasing toughness at lower temperatures. Hence,  temperature parameters should be followed as per code for correct result.

The Re-bend test consists of bending a sample of TMT Re-bar through plastic deformation by applying a load against a suitable mandrel to an included angle of 135 degree. The bend sample should be aged by keeping in boiling water (100 degree C) for 30 minutes and then allowed to cool. The sample should be bent back to have an included angle of 157.5 degree. Test is usually carried out at room temperature. The mandrel diameter used for different grades of TMT Re-bar is given below.

The sample which has been used for bend test is not to be used for Re-bend test.

While applying load on the sample bar it is important to ensure that the load is uniform, smooth and vertically downwards. Impulse load should be avoided.

The specified mandrel diameter used for different grades of TMT Re-bar for Re-bend test are given below as per IS 1786-2008.

* Where Φ is the diameter in mm of the test sample.

* The sample shall be considered to have passed the test if there is no rupture or crack visible at the bend (tension zone) portion to a person of normal vision.

What is Chemical Analysis Test in TMT Bar?

Cross section wise 50mm/60mm length sample cutting from TMT Re-bars by abrasives, grinded and polished one side is used for chemical composition testing in a spectrometer. The spectrometer takes 10 to 15 seconds to give results in printed form of a maximum of 26 elements in the TMT. The spectrometer mainly gives the results of the percentages of carbon, sulphur, and phosphorus which are important as per BIS. In case of micro alloyed grade TMT, percentages of chromium, copper, manganese etc. are also shown by the spectrometer.

The maximum allowable percentages of different elements as mentioned in the IS: 1786-2008 are as below:

Basic Construction Safety Guidelines

Construction sites are always exposed to high risk. Because of the kind of work, materials, processes etc. It is important to ensure safety at work starting from the workers, engineers, employees and everyone else. Like the way it is important to use only Verified and Best Quality TMT Bars in the same way few factors are important to be taken care of while working at construction site:

• Wearing Safety Shoes is mandatory while present at construction site
• Wearing Construction Helmet is important while present at site
• Always carry dust protective mask and wear it whenever it is required
• Inspect all the equipments before using and ensure that it is secured
• To deploy an efficient supervisor is important to run all the work at construction site smoothly