Andheri Railway Station Bridge Collapse Could Have Been Avoided If Stainless Steel Rebars Were Used - Mr YPS Suri

- Jul 04, 2018-

Experts expressing concern at collapse of road over bridge on the Eastern side of Andheri Railway station in Mumbai of life have stressed on the need of use of corrosion resistant Stainless steel reinforcement while constructing bridges in coastal areas including Mumbai. Tragedy would have been averted if Stainless Steel reinforcement rebars would have been used in the bridge constructed in the year 1971. In last few years there has been increasing interest in alternative approaches to durability of marine structures world wide as traditional approach of improving durability of reinforced concrete structures has been found outdated to the growing problem of chloride –induced corrosion. Most of the countries world wide have switched to corrosion resistant stainless steel reinforcement.
 
Mr Yatinder Pal Singh Suri, Managing Director and India Head, Outokumpu India, one of the largest stainless steel making company in the world and Chairman, Plant Process Machinery Association of India (PPMAI) and former President, IIT Kharagpur Alumni Association said “Countries including USA, New Zealand, Australia and UAE have made it mandatory to use stainless steel reinforcement in coastal areas for marine structures including bridges. Stainless steel reinforcement re-bars are emerging as an excellent sustainable solution for the concrete bridges in coastal and hill areas. The stainless steel reinforcing bars provide  long life into concrete structures especially in the hills, coastal areas, ports, airports, bridges, high rise buildings and water treatment plants as these bars do not ever corrode and thus concrete failure due to spalling is avoided.”

Mr Suri said “Since stainless steel does not corrode, the concrete continues to offer a maintenance free life of over 100 years. There are global examples to showcase this. Our planners must make use of stainless steel re-bars mandatory in corrosion prone areas of the bridge. This would mean substituting just 5-10 per cent of the total rebars to be used in a bridge from carbon steel to stainless steel. The cost of the bridge project cost may go up by a 2-3 per cent but the life will go up to 100 years that too almost maintenance free.”

He said “A few years back Maharashtra Government had made it mandatory use of stainless steel reinforcement in its two major projects Manori creek bridge, sea link 2nd phase (WFSL) and Mithi river bridge. But after some time the order on use of Stainless steel reinforcement as withdrawn by the government.”

He said "Duplex Stainless steel reinforcing bars are although more expensive than carbon steel but it can be used selectively in failure prone zones only thus increasing the project cost marginally and at the same time we can get over 100 years maintenance free life which means lots of savings by reducing the ongoing repair and maintenance costs of structures like bridges, coastal area projects, water treatment plants,  high rise buildings and highways." 

Mr Suri also said "Over the last 3 decades, premature deterioration of reinforced concrete structures has become a serious problem worldwide due to corrosion of the embedded steel. The estimated cost of repair is in excess of USD 550 billion.”

Mr Suri also said "The other benefits of stainless steel reinforcement include significant increase in durability and reduction in repair and maintenance costs, elimination of concrete sealants and reduction in thickness of the concrete cover.”

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