HYSD bars possess high yield strength than mild steel but TMT bars yields greater tensile strength, flexibility, and ductility than high yield strength deformed bars. TMT bars or Thermo-mechanically treated bars is a technological progression for the production of high strength deformed steel bars for concrete reinforcement. They have a tougher outer core and softer inner core. The high strength of these bars are obtained from thermomechanical treatment wherein the bars get cooled off intensively right after rolling. The quick reduction in the temperature of the exterior layer makes it harder while the interior layer still being hot. The ductility and strength of the bars enhance due to the tempering that takes place due to the heat from the core of the bar. This approach generates a very strong external surface hardened by the steel crystalline formation. The high temperatures and consequent shaping by twisting and rolling effects in the micro-structure unique to the TMT bars.
Advantages of using TMT bars in construction
Thermomechanically treated bars offer excellent weld-ability, great strength workability, healthier elongation, and ductility. Because of their amazing flexibility in construction and renovation, they are suitable for a broad variety of uses. Using TMT bars in construction increases the speed of construction and decreases the cost spent. TMT bars are lightweight when compared to the other alternatives which make the maintenance and transportation of TMT bars more convenient than others. The thermomechanically treated bars depreciates the risk of damage during earthquake, fire and similar natural disasters. The steel of thermomechanically treated bars rods can be recycled without any lack of quality. The steel frames needed for the production can be easily created and compiled in the construction factory itself.
TMT steel bar doesn’t crack or break even after turning and bending 180 degrees. Better elongation and flexibility of the TMT bars are due to the better ductility of the steel. TMT bars with higher elongation rate are easy to transport and gives better cost efficiency when compared to cold twisted deformed bars. For sounder ‘sudden load absorption’ capability, the Fe 500D TMT bars is preferred because of its ductile nature. TMT bars possess high thermal stability and can withstand temperatures varying from 400 to 600 degrees celsius. Thus, they are excellent for resisting fire and implementing safety.
The thermomechanical process gives the bars anti-corrosive qualities. The water cooling procedure for TMT bars resists the formation of coarse carbides in the bars. Absence of surface stresses and coarse carbides makes the bars corrosion resistant. Using TMT for construction thus aids in the longevity of the structure. When considering TMT bars for construction to ensure quality, it is very important to make sure that its bought from a trustworthy manufacturer.
Grades of TMT bars
There are four distinct grades of TMT Steel available in India; Fe-415, Fe-500, Fe-550, and Fe-600. The grade number, yield strength, and tensility are directly proportional. The higher the grade number, the higher the values are.
Below are the areas of uses for different grades of TMT
- Fe 415: RCC Constructions in areas with great corrosion and earthquake incidence.
- Fe 500: RCC constructions, in building, bridges and other concrete structures.
- Fe 550: RCC construction that is exposed to humid coastal, marine or underground areas.
- Fe 600: used for large RCC construction purposes.
Wooden structures are lightweight, energy efficient, versatile and sustainable solutions. In Earthquake prone areas wooden structures have the advantage that the wooden framed building won’t break off easily. They are flexible, economical and more versatile compared to concrete structures. Availability of cheap wood, flexibility, and aesthetics were the major factors that induced people towards wooden structures.But the case is different for cyclone-prone coastal areas. Although the vulnerability of a structure to a cyclone is circumscribed by its siting, the possibility that a cyclone will occur, and the extent to which its edifices can be damaged by it, concrete structures are always preferred than wooden ones. Concrete buildings, although ordinarily more expensive than wood frame structures, are totally worth it in the long term.
Over the past few months, a slew of fire accidents has occurred In India damaging human lives, properties and goods. In a tragic incident, 20 students died after a fire broke out in a private coaching center in Surat, Gujarat last month. Eyewitness recall that in a bid to escape the blaze, students were seen jumping and falling from the third and fourth floors of the building. This accident is just one of the countless fire tragedies in the country.
Corruption in both public and private undertakings is not an unusual or uncommon scenario for a resident in a country like India. The dangers of corruption for unlawful gains have lead to disaster, of which collapse ——– was discussed in —- blog. But ever wonder why not every structure or construct you have known where corruption has eaten up quality is still functioning as its supposed to. It’s not just God’s grace, but a large part of its credit goes to the Engineer who made the plans and necessary load calculations for the construct. So why do they make such calculations. On planning structures, an engineer has to calculate structural load which comprises of both dead loads and live loads acting on it, and also the environment loads and much more. This is so especially in cases of bridges and structures where live loads are more prominent. In this blog we will be discussing more on how loads are calculated for buildings.
The construction of buildings is quite innovating and are truly a marvel. When we compare the current timeline with the ancient timeline, we can see that the number of buildings has risen tremendously over the centuries. With time, different types of innovations in constructions were introduced. This resulted in the construction of better, stronger and taller buildings that are safe to live in.
Constructing buildings is not an easy task, It requires a lot of resources, technical skills, dedication and commitment. When we talk about the resources, the most vital components for constructing buildings are reinforced steel and concrete. Reinforced steel is primarily known for its excellent strength and ductility which provides the necessary strength to withstand the load of the structure. However, there are several factors that can affect the strength of the steel in such a way that it becomes extremely dangerous to the whole structure, and one such factor is rusting.
Our last blog described the TMT steel bars and its importance as reinforcement for the construction of commercial buildings. More specifically, it described the standard IS 1786:2008 that every reinforced steel bar should conform to. The IS standard defines certain guidelines that must be followed when manufacturing the reinforced steel bar.
The introduction of reinforcement drastically changed the phase of construction of building structures of steel. Reinforced steel provided the necessary tensile strength which the concrete lacks. Today, very few constructions are done without using reinforced cement concrete. At the current scenario, the most used reinforced steel bars are the Thermomechanically Treated (TMT) steel reinforced bars. They are preferred for their excellent tensile strength and optimum ductility. The TMT steel bars are of different grades namely Fe 415, Fe 500, Fe 550 and Fe 600.
TMT steel reinforced bars have been used in constructions of building structures for a long time. They are primarily preferred due to the advantages offered in terms of tensile strength and ductility ratio. TMT Steel reinforced bars consists of different grades namely Fe 415, Fe 500, Fe 550 and Fe 600. Because of the availability of different grades and many dealers promoting different versions of the steel reinforced bars, purchasing the right TMT steel reinforced bar is an important task
Natural disasters are usually one of the troublesome challenges for building structures to overcome particularly, the reinforced steel. Natural disasters are of many types, but the most common disaster occurrence in our country are earthquakes. There are many scenarios of structural collapses due to earthquakes. Although the causes can be attributed to several factors such as the age of building structure, lack of maintenance etc, the most important factor to be attributed is the ductile nature.