Water/cement ratio expresses the dilution of the paste – cement content varies directly with the amount of paste. Gradation of aggregate is controlled by varying the amount of given fine and coarse aggregate. Consistency is established by practical requirements of placing.
4.1 Process of manufacture of concrete
The various stages are the following:
(a) Batching: The measurement of materials for mixing is known as batching. It can be done by two ways –
(1) Volume batching
(2) Weight batching
(b) Mixing: The mixing should ensure that the mass becomes homogeneous, uniform in color and consistency. Mixing can be done by two ways -
(1) Hand mixing
(2) Machine mixing
(c) Transporting: The precautions to be taken while transporting concrete is that the homogeneity obtained at the time of mixing should be maintained.
Methods:
(1) Mortar pan
(2) Wheelbarrows
(3) Bucket and rope way
(4) Truck mixers and dumpers
(5) Belt conveyors
(6) Chute
(7) Displacement pumps
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