The process of rolling, folding and spreading of particles is known as the mixing of concrete. The materials of concrete should be mixed thoroughly so that there is uniform distribution of materials in the mass of concrete.
The thorough mixing also ensures that cement water paste completely covers the surfaces of aggregates. The mixing of materials of concrete can be done either with hand or with the help of a cement mixer machine.
Hand Mixing:
For hand mixing, the materials are stacked on a water-tight platform, which may be either of wood, brick or steel. The materials should be thoroughly mixed, at least three times, in dry condition before water is added.
The prepared mix should be consumed in 30 minutes after adding water. The mixing by hand is allowed in case of small works of unimportant works where small quantity of concrete is required. For important works, if hand mixing is to be adopted, it is advisable to use 10 percent more cement than specified.
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