Quality control of concrete
Concrete is generally produced in batches at the site with locally available materials of variable characteristics. This results in a variation of strength from batch to batch and also within the batch. The factor controlling this difference for concrete of a given level of strength is called quality control.
In other words, quality control is the control of variation in the properties of the mix ingredients and control of the accuracy of all those operations which affect the strength or consistency of concrete.
Thus quality control is a production tool to ensure that all aspects of materials, equipment and workmanship are looked after.
Purpose of quality control
Quality control is adopted to achieve the following purposes:
1) To reduce the variation in strength and consistency of concrete produced in different batches.
2) To ensure the production of uniform material having desirable characteristics.
3) To ensure desirable quality at every stage of work.
4) To reduce the maintenance cost.
5) To expedite the work.