Answer Posted / p.prakasa rao

This is unfortunate to write that,

Designed concrete mix may be economical (only), but the nominal mix concrete structures are so stronger as there were several old structures are having more life till now also and they constructed sincerely for long years ago.

So my conclusion is, now -a -days we should not appreciate the technology like designed mix, application of curing compound etc.. Sincerity ,dedication on execution of works are important.

Now-a-days, how many structures are caring about the curing?

Some other new technology is required to fulfill the present fast demands for satisfying the long term stability of structures.......

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