Mechanical mixing is the
best way of mixing concrete. Batch mixers with a tilting drum for use on
building sites are available in sizes from 85 to 400 litres. Power for the drum
rotation is supplied by a petrol engine or an electric motor whereas the
tilting of the drum is done manually. The pear-shaped drum has blades inside for
efficient mixing. Mixing should be allowed to proceed for at least 2.5 minutes
after all ingredients have been added. For small scale work in rural areas it
may be difficult and rather expensive to get a mechanical mixer.
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