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what is lifespan of an RCC structure?
Why the RCC structures failing in quater of its life span?
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Answer Posted / khanna
One of the most important test conducted on cement is soundness test. This test certifies how the concrete prepared with that cement will behave in the next 80 years, when subjected to weathering, I.e., hot days cool nights, summers and winters etc.
Two methods of testing is prescribed by BIS. First one Le-chatlier method is old, crude but cheap and is available in all the labs, and second one autoclave method is modern and costly, therefore not available in all the labs.
My experience says 99% cement samples passed in le chatliers expansion shows poor results in autoclave expansion.
To generalise RCC age as 80 years is wrong, as even the building is ideally constructed, following all building code, but the cement is not tested as per autoclave expansion than the life of RCC may be reduced considerably.
Looking at the present constructions the safe life of RCC may be taken as 80 years, if constructed as per NBC of BIS.
Even the IS-456 is modified again in 2000.
A small house is constructed on word of mouth assurance of material vendors that material is in order, of labour contractor that every material is properly mixed and placed in position, of architect and structural engineers that sufficient factor of safety has been considered, but who will be alive after half life of building, to see different type of failures of RCC.
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