This does vary because no two cements are the same, sands are of different grades, some additives are stronger than others but the general recipe is as follows;
A Equal parts Cementitious Material and Sand (Cementitious Material = Cement and up to 25% of Pozzolan)
B Acylic Polymer – 3% cement weight
C Superplasticiser – this requires slump testing but typically 0.25-1.0% cement weight
D Water – 29-30% of cement weight
E Alkali Resistant Glass Fibres – 3-5% cement weight
The recipe will also change depending on how the concrete is applied. For example if the concrete is to be sprayed, the superplasticizer will need to be dialled back. If a vertical hand-applied mix is required the sand to cement ratio as well as the superplasticizer will need changing. For a self-compacting mix just the right amount of water vs superplasticizer will need to be achieved.
Of course, with our Premix Kits we’ve done all the hard work for you!