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COVER TO COLUMN,GB AND PEDESTAL BELOW NGL

 
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thirumalaichettiar
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Joined: 26 Jan 2003
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PostPosted: Sun May 10, 2020 11:14 pm    Post subject: COVER TO COLUMN,GB AND PEDESTAL BELOW NGL Reply with quote

Dear Engineers,


I have a doubt on the cover to column below Natual ground level. I attach my write up as PDF file. Please go through it and post your comments.

T.RangaRajan.



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COVER TO COLUMN BELOW G.L.pdf
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thirumalaichettiar
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PostPosted: Wed May 13, 2020 2:42 pm    Post subject: Reply with quote

No body wants to share their views?
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syed_A
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Joined: 22 Oct 2011
Posts: 387
Location: Hyderabad

PostPosted: Thu May 14, 2020 1:57 pm    Post subject: Reply with quote

Dear Sir
My observation
Backfilling is done when the column/pedestal hardened, hence less chance of concrete getting mix with soil, where as 75 mm cover is provided as the fresh concrete is in direct contact with soil and while pouring concrete get mix with soil. To avoid this 75 mm provided so that say first layer of 15 to 20 mm is direct contact with soil and remaining 50 mm free from such contact.
There can be many more reason beside this

Regards
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