water ratio for backfilling with sand cement mix

[jasem81]

Gents,
I have a crowded area of foundations, want to use the sand cement mix for backfilling, 50 kg cement for 1 MT of sand
my question is how much the water ration shall be
I need a reference please

 

[MotorCity]

Why not just backfill with sand (no cement)?

 

[jasem81]

Client didn't accept

 

[MotorCity]

A mixture of sand, cement, and water for backfill sounds like flowable fill. We usually specify f'c = 1500 psi and let the supplier determine the water required. The other option would be to select a w/c ratio of say 0.45 and calculate the water.

 

[cvg]

http://www.nrmca.org/aboutconcrete/cips/17p.pdf

 

[BAretired]

Fine aggregate may contain moisture, so use just enough additional water to produce a flowable consistency. See the following for further suggestions:

http://www.scdot.org/doing/technicalpdfs/suptechspecs/sc-m-210.pdf

BA