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THERMEX Quenched & Tempered Rebars

SECTION 2: Relevance of Thermex Rebars

SECTION 1: Steel 2020
Basic Global Norms
Comparison: India & China
THE YEARS AHEAD: 2005 - 2020
SECTION 2: Relevance of Thermex Rebars
Global Trends in Rebars
Relevance of THERMEX Quenching & Tempering Technology
H&K India Thermex References and Photos of Installations

thermex-bar-structure.jpg

BASIC INDIAN FACTS

 

World over, rebars are specified for use in RCC by the Yield Strength, India being the exception. Till the start of this century nearly all structural designers in the country talked in terms of CTD or Torsteel rebars only. The dominance of CTD bars in the civil industry was so profound since early 1970s that most civil engineers had become guilty of assuming that these were of Grade Fe 415 of IS 1786-1985. Hardly anyone really bothered to check the yield strength, ultimate tensile strength or the elongation when using CTD rebars in RCC. It was nearly always taken for granted that these bars meet the IS code specified. Today, it has become fashionable to talk in terms of ‘TMT’ rebars. And probably out of habit acquired over the past few decades, the gullible civil engineer has again merely assumed that these ‘TMT’ bars are of the specified Grade Fe 415 but in many ways superior to the old CTD bars. The many civil engineers that the author has spoken to in the past few years were surprised to learn that the blind use of TMT bars as available from stockists and traders is not a guarantee of a superior product.

The Indian citizen has a right to know whether the house he stays in is a safe one that has been built with proper materials. Indian life is as precious as that of those in other countries. The world recognises an Indian as a person of high intellect who can contribute a lot to society. We must do what is necessary to protect his life as much as possible. Then again, we must appreciate that about 50-60% of the Indian land mass falls under the seismic 3, 4 & 5 categories. (See Seismic Zone Map). So, safety of construction is of prime importance in the country. There is no place for casualness or complacency with regard to rebars.

 

 

india_seismic_zones.jpg
Seismic Zones of India

 

A study of world trends is useful in deciding on what needs to be done here.

THERMEX is a registered trademark of H&K Rolling Mill Engineers Pvt. Ltd. in India and is owned by HSE, Germany in other Countries