What is the right concrete mix ratio?
A common general purpose concrete mix is 1 part cement to 2 parts sharp sand to 4 parts gravel, or 1 to 5 using all in ballast. For foundations a stronger 1 to 3 to 6 is often used.
For most general work a mix of 1 part cement to 2 parts sharp sand to 4 parts coarse aggregate works well. If you are using all in ballast, which already blends sand and gravel, a ratio of 1 part cement to 5 parts ballast gives a similar result.
For foundations and heavier duty slabs a leaner structural mix such as 1 to 3 to 6 is common, while a strong mix for posts and thin sections moves towards 1 to 3. Always match the mix to the job and the specification.
Otis converts a slab or footing into cubic metres, works out the cement, sand and ballast for the chosen mix, checks stock and prices the materials for the account.
General guidance for the trade. Always follow current Building Regulations, manufacturer instructions and the specifics of the job.
See what Otis would capture for you
Book a strategic call and we will model it against your own numbers.