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# Reply to Roof Concrete Strength

Mon Feb 24, 2014Total posts : 69
 Jahankumar Join date: Feb 2014
Topic: Reply to Roof Concrete Strength

Dear Navneet Jharia & S L Gupta Sir
Thank you very much for your Kind & Useful Reply of  regarding Roof Concrete Strength.
1)Main Rod Dia 10mm at 6" C/C with Cranking
2)Distributor Rod  Dia 8mm at 8" C/C
3)Roof Beam Dia 12 mm -5 Nos with Center Cranked & Height 12" Including 5" Roof Slop.
4)So Roof Beam Height (12"-5") = 7"
5) It has 16' x 16' Hall. So Two way Slap were done with Concealed Beam of Dia 16 mm -4 Nos at Middle.
6)All above are verified by taking photos with Measurement by Measuring Tape.
7) But Regarding concrete Strength , I have doubt that it will come between M15 (15 N/mm^2) to M10 (10 N/mm^2) by Reducing Cement by Builder.
8) How to check concrete Strength any conventional method  whether M15 (15 N/mm^2) or  M10 (10 N/mm^2). Suppose If it is between M15 (15 N/mm^2) to M10 (10 N/mm^2) , what is the way to improve the concrete Strength above M15 (15 N/mm^2).
9) Can we increase concrete Strength by Inner Ceiling Plastering ratio of 1:3 by Two Layering (or) using Admixture like Dr Fixit etc.,
10) Because Inner Ceiling Plastering  is not started yet.
11) Any Instrument is there to find whether it is M15 (15 N/mm^2) (or) M10 (10 N/mm^2)??
12) Also Weathering Proof is not started yet. Can we increase Ceiling Strength by  doing some modification at Weathering Proof.

Jahankumar

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 Wed Feb 26, 2014 Post  #1 S L Gupta (Civil Engg)Join date: Mar 2008 Dear Jahankumar            The way to find out the cement concrete ratio is that take sample of concrete from slab and send it to the lab. who after analysis give the result of concrete mix according to ratio used.        As stated already,  You should take help of any civil engineer, who can see the slab personally and check it by chiseling and hammering and also see the  span of the beam and slab. There is no use to add any extra concrete layer to the old concrete slab it will not add any strength but with extra concrete increase the load on the slab which  is unnecessary.        A good cement plaster 1;3 ratio also give some additional strength to some extant only.
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