Calculating quantities of materials in concrete..
First of all we should discuss the factors affecting the calculation
- Dry Volume/ Loss due to wastage
- The mixed proportion
- Unit volume and density of materials e.g. weight of cement bag, volume of 1 brass
Now, change in volume is considered to be 52% approximately inclusive of losses. so we multiply the volume of wet mixed material by 1.52 to get the dry volume.
Mixed proportion plays major role in volume calculation. We have different mix proportions of concrete for various strengths. accordingly the proportions change.
The step wise calculation for 1 cubic meter of concrete is shown in following image
Hope it Helps!