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correct concrete mix?

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(@kenneth)
Posts: 51
Trusted Member
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I'm trying to mix some concrete on my own. just for some patch up jobs etc. I've been somewhat successful so far. However when I try to make small things from molds, like fill a small plastic cup with concrete, the surface finish isn't good, its full of holes on the sides, although it does seem pretty solid. I used the ratio of 1 part white sand, 1 part republic cement, around 1/4 water. Since these are just small stuff I don't think I need to add gravel in the mix. What should I do? Add more cement to the mix? or I should have compacted it more?

 
Posted : 22/05/2008 12:50 pm
(@Anonymous)
Posts: 0
New Member
 

Re: correct concrete mix?

Try adjusting the mix. a 1:1 ratio of sand to concrete will give you too rich a mixture. Try 1:2 or 1:3 of cement and sand.

Rather than compacting the mix try vibrating the mix so that the air bubbles lift our of the mix.

 
Posted : 23/05/2008 4:34 pm
opzuk4x4
(@opzuk4x4)
Posts: 146
Estimable Member
 

Re: correct concrete mix?

I agree, 1:3 should be just fine. Vibrate to eliminate the voids.

GACA CONSTRUCTION

 
Posted : 24/05/2008 9:08 am
(@gary505)
Posts: 6
Active Member
 

Re: correct concrete mix?

Would a 1:3 mix work for outside CHB plastering too?

 
Posted : 30/05/2008 3:01 am
opzuk4x4
(@opzuk4x4)
Posts: 146
Estimable Member
 

Re: correct concrete mix?

Yes Gary. That is an ideal ratio for palitada purposes.

GACA CONSTRUCTION

 
Posted : 30/05/2008 7:51 am
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