MIXING
•Done in order to ensure each particle of aggregate in fresh concrete will be coated with the cement paste
•Also to give a homogenous even coloured product.
•First stage of mixing is called “BATCHING”.
•Batching is process where it involves weighing out or measuring out all of the ingredients for a batch of concrete.
•The materials that are mixed at any one time constitute a batch.
•Quality of concrete depends on the accuracy of the batching operation.
•However, thorough mixing is essential for complete blending of the materials that are required for the production of homogeneous, uniform concrete.
•Inadequate mixing result in lower strength.
•There are 2 method for concrete mixing that is:
a) hand mixing
b) machine mixing
•The biggest problem with concrete produced with construction mixers on site is quality control.
