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Used M15 (1:2:4) mix ratio with PPC cement for casting ground floor house roof slab

Mon Feb 20, 2017Total posts : 3
vinu
vinu
Join date: Oct 2015
Topic: Used M15 (1:2:4) mix ratio with PPC cement for casting ground floor house roof slab

My contractor used M15 (1:2:4) mix ratio for casting the ground floor roof slab of thickness 5 inch. The total area is 1400 sqft and maximum room size is 14 x 14 feet.

The contractor says there is no need for M20 since we used TATA TMT 10mm and 8mm with spacing 6 inch, and Ultratech PPC cement which gives the final strength almost equal to M20. 

Is it right? Do I need to worry about anything?
Mon Feb 20, 2017Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Vinu,
       It is of no use to consult with any one,after laying the slab.
 
Mon Feb 20, 2017Post  #2
vinu
vinu

Join date: Oct 2015
Sir, I am asking this to decide on the ratio to be used for 1st floor slab which will be casted next month.
 
Tue Feb 21, 2017Post  #3
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Vinu,
         I am in view that you should use cement concrete 1;1.5;3 for beam and slab. The latest norm due to earth quack is that all the cement concrete should be M 20.
Further I tell you that M20 have 133% strength with comparison of M15 i.e 33 % extra strength. If You have 14'x 14' room/hall size at first floor than lay hidden beam on one side in the slab the beam size may be 9''x 6''.
 

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