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# Water requirement for 4inch thick rcc roof slab of area 1200sqft.

Tue Jan 24, 2017Total posts : 2
 vinu Join date: Oct 2015
Topic: Water requirement for 4inch thick rcc roof slab of area 1200sqft.

Since three is water shortage in my area I want to collect water in tanks/drums for the RCC roof work of my house. The approx slab thickness is 4 inch and area is 1200sqft. So, please suggest the approx. water requirement in liters.
 Wed Jan 25, 2017 Post  #1 S L Gupta (Civil Engg)Join date: Mar 2008 Dear Vinu,        See belowWater for nominal mix concrete shall generally be equal to 5% by weight of aggregate and 30% by weight of cement. Generally for vibrated concrete the quantity of water will be less by 20% but the actual quantity shall be determined by the field test for slum. For one bag mixture, 32 liters of water is required and the ratio will be 1:2:4 For one bag mixture, 30 liters of water is required and the ratio will be 1:1.5:3 ,
 Wed Jan 25, 2017 Post  #2 vinod singhJoin date: Jan 2017 Dear VinuThe quantity of concrete is = 1200 * 4/12 = 400 cu.ft = 11.5 cubic meter(cum)Considering M25 Mix consuming 7 bags cement per cum.water/cement ratio of 0.55then water = 0.55 *7*50 = 192.5 liter per cum of concretefor 11.5 cum ,water = 192.5 * 11.5 = 2214 literskeep 20% extra miscellaneous use than total = 2214 + 0.2*2214 = 2657 literkeep 2657 liter water tank ready for casting slab

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