How many bags of cement do i need with one tonne of hardcore?

The number of bags of cement needed with one tonne of hardcore depends on the intended use and the concrete mix ratio. For a standard mix (1:4:8 for cement, sand, and hardcore), you typically need about 1 bag of cement (25 kg) for every 0.5 cubic meters of concrete. One tonne of hardcore is approximately 0.5 cubic meters, so you would need about 2 bags of cement. Adjustments may be necessary based on specific project requirements.