I need to mix 100 litres of good quality concrete. Using 20mm (or thereabouts) ballast, What weight (Kg) of cement is needed for a 3:1 mix?
TIA
I need to mix 100 litres of good quality concrete. Using 20mm (or thereabouts) ballast, What weight (Kg) of cement is needed for a 3:1 mix?
TIA
Don't forget the fine aggregate - you need to fill those gaps.
At I:3 mix by volume you'd need 25L cement and 75L ballast Cement weighs approx 1600kg/m³ = 1.6kg/L so you'd need 40kg = just over 1½ bags.
I:3 is a *really* strong mix though. 1:6 is good quality, so one 25kg bag of cement would be perfect.
About 15 good shovels. Why are you going 3:1 with concrete, though?
He's using ballast.
Various online calculators:
The message from "jim_in_sussex" contains these words:
Concrete is usually specified in terms of volume and with 3 constituents
- gravel, sharp sand and cement - and 3:2:1 is a very strong mix.
According to my ancient source of information a cubic yard of 3:2:1 concrete requires 0.748/0.499/0.299 cu yards of each constituent or
0.794/0.601/0.271 tons. Oh yes and 30.9 gallons of water (which presumably assumes that the aggregate is perfectly dry, an impossibility in my experience).HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.