How to make a concrete seat
Step 3.1 The dry mix
Pour 4½ buckets of aggregate into the wheelbarrow and also 1 bucket of cement.
Give it a bit of a mix around with a spade.
Make a small crater in the top of the mix to take the water.
Note: aggregate is a mixture of different size stones ranging from 20mm (¾") diameter maximum, down to the size of a grain of sand. The smaller stones fill up the cavity created by the bigger stones.
Step 3.2 The wet mix
Next add the water: approximately half a standard household bucket to begin with. Mix with the spade from underneath and fold over. Keep doing this and adding more water if required, until the mix is a uniform consistency.
Tip: when mixing, a smaller spade is easier to work with than a larger one.
Safety note: Prolonged contact with fresh concrete will burn your skin.
One mix will make one concrete seat.