Concrete Calculator (25kg Bags)
Here’s a comprehensive table with all you need to know about using 25kg bags of cement for concrete mixing:
| Aspect | Details |
|---|---|
| Standard Mix Ratio | 1:2:4 (cement:sand:coarse aggregate) |
| Cement Quantity | 1 x 25kg bag |
| Sand Quantity | 2 x 25kg bag equivalent (approx. 50kg) |
| Coarse Aggregate Quantity | 4 x 25kg bag equivalent (approx. 100kg) |
| Water Quantity | Approximately 13-14 liters (0.55 x cement weight)2 |
| Yield | Approximately 0.1 cubic meters of concrete |
| Strength Classification | C20 (medium strength, suitable for most domestic jobs)3 |
| Common Applications | Garden paths, fence posts, shed bases, shallow foundations3 |
| Mixing Method | Hand mixing or small concrete mixer |
| Workability | Add water gradually to achieve desired consistency |
| Curing Time | 28 days for full strength3 |
| Safety Precautions | Wear gloves, dust mask, and eye protection |
| Storage | Keep cement bags dry and off the ground5 |
| Shelf Life | Typically 3-6 months if stored properly |
Additional Tips
- Measuring: Use a consistent container (e.g., bucket) for volume measurements2.
- Mixing Surface: Use a non-porous surface like a mixing board or tarpaulin3.
- Thorough Mixing: Ensure all components are well-blended before adding water3.
- Water Addition: Add water gradually and mix thoroughly to avoid over-watering3.
- Workability Test: A proper mix should be slightly liquid but hold its shape when formed into a low cone5.
Remember to adjust quantities proportionally for larger or smaller projects, and always wear appropriate safety gear when handling cement.