Example: shed base 8' long x 6' wide x 3" deep the volume = 8' x 6' x 0.25' = 12 cu ft 2 bags per cubic ft = 24 bags add 10%, 3 bags for compacting total 27 bags of ballast cement 1 bag (25kg) of cement mixed with the ballast in the ratio of 1:5, 1 bag of cement to 5 bags of ballast 27 bags of ballast divide by 5 and round up would = 6 bags of. Constructing a base for a shed. 1 bag (50kg) of cement mixed with 'all-in' ballast in the ratio of 1:5 makes: 24 sq ft of concrete 3" thick or 18 sq ft of concrete 4" thick. ie. 3" thick base cement = 2 bags for a 8' x 6' base (48 sq ft). So you will need 2 cubic metres of ballast for the concrete plus whatever you use for the hardcore. rubble used for the hardcore will have voids that need filling up. ballast will do this although i prefere skalpings because it forms a firmer base. for a shed i'd work on 9-12" of hardcore and 6-9" of concrete..
Using ballast for shed base concrete by: john hi edward, diy concrete is generally mixed by volume and comprises 1 part cement, 2 parts sand and 3 parts coarse aggregate. as you are using ballast which is a mixture of sand and coarse aggregate then the ratio of 1 part cement to 5 parts ballast is correct.. Adding too much water to where the concrete flows like water dilutes the amount of portland cement in the mix and it makes the concrete weak. use a mortar hoe or small shovel in a wheelbarrow to. Concrete is a mixture of cement, sand (fine aggregate), small stone or gravel (coarse aggregate) and water. it has many applications, from fence posts to motorway bases and, because of this, there are many different concrete mix ratios that the constituents can be mixed to with each resulting in a different strength. concrete mix ratio for a.
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