The ratio of cement to ballast can vary depending on the desired strength of the concrete mix. A common mix is 1 part cement to 5 parts ballast. Therefore, for a 25kg bag of ballast, you would typically use around 4.30kg of cement.
Ballast is a dense mixture of sand and gravel crushed small rock stone that’s form rough coarse aggregate used in extensive range of Construction application, primary it is used for heavy duty work and making concrete.
Typically, the weight of ballast is about 1.75 tons per cubic meter or 1,750 kilograms per cubic meter (kg/m3). It is available in a small bag of 25kg which yields volume about 0.0143m3 (since, the volume of a 25kg bag of ballast = 25/1,750 = 0.0143m3.
As a rule of thumb, a 25kg bag of ballast covers an area of 0.25m to a recommended depth of 50mm (or 2 inches).
As a rule of thumb, you will need approximately 70 to 72 a small 25kg bag of ballast for one cubic metre of concrete. So, there would be 70 to 72 bags (each 25kg) of ballast in one cubic meter.
Using a 6:1 ballast to cement ratio, you will need approximately 0.16 x 25kg bags of cement to a 25kg bag of ballast. This will give you 4kg of cement to mix with one 25kg bag of ballast.
Using a 5:1 ballast to cement ratio, you will need approximately 0.17 x 25kg bags of cement to a 25kg bag of ballast. This will give you 4.3kg of cement to mix with one 25kg bag of ballast.
Using a 4:1 ballast to cement ratio, you will need approximately 0.22 x 25kg bags of cement to a 25kg bag of ballast. This will give you 5.4kg of cement to mix with one 25kg bag of ballast.
How much cement to a 25kg bag of ballast
In general, there would be 4kg of cement to a 25kg bag of ballast with 1 part cement to 6 parts ballast mix, while with 1 part cement to 5 parts ballast mix, there would be 4.3kg of cement to a 25kg bag of ballast. In addition, there would be 5.4kg of cement to a 25kg bag of ballast with 1 part cement to 4 parts ballast mix.
Here’s are table for how much cement do i need per 25kg bag of ballast:-
| SL.no. | Mix ratio | Cement in kg | Cement in m3 |
| 1 | 6:1 | 3.6 kg | 0.0024 m3 |
| 2 | 5:1 | 4.3 kg | 0..0030 m3 |
| 3 | 4:1 | 5.4 kg | 0.0036 m3 |
Conclusions:–
Using a 4:1 ballast to cement ratio, you will need approximately 0.22 x 25kg bags of cement to a 25kg bag of ballast. This will give you 5.4kg of cement to mix with one 25kg bag of ballast.