F
I presume when you say gravel, you are using sand? I have used 4:1 or 3:1 in the past in mixing out loads for building a house. For the price of a couple of bags of cement, at least you know you have a good mix.
I'm not DIY minded, I did what I was told!
Steven
the cracking and shrinking is due to the heat generated in the mix as it cures, [its an exothermic chemical reaction,] especially if plasticisers are used which reduce the amount of water used.
If you keep the top surface wet, standing water wet, not just damp, for the first 7 days or so, then it will reduce the risks.
See here:
http://www.cement.org/for-concrete-.../concrete-construction/curing-in-construction
No worries.Thanks for the advice,think I will play it safe go with 1:5 mix.Theres steel mesh in the foundation aswell so I should be god.
No worries.
What I do is rent a small vibrator and it works wonders for getting it to flow if the consistency is right. A small amount of the proper admixture will really help.
http://www.sbsg.com/concrete/admixtures/
I mean proper, not Fairy liquid which is often used which destroys the concrete bond
If u space the levelling pegs close enough the vibrator will leave it level enough without any need for screeding or standing in the trench
If the ground where you are pouring the concrete mix is good and your mix of 1 cement to 5 of your gravel mix is reasonably accurate you need have no worries. In my experience 1 : 3 would be ridiculous. Finish your footings tomorrow and sleep well.
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