ABSTRACT
A batch is one mixing of concrete and can be carried out by measuring the quantities of materials required by volume or weight. The main aim of both methods is to ensure that all consecutive batches are of the same standard and quality. Weight or weigh batching is a more accurate method of measuring materials for concrete than volume batching since it reduces considerably the risk of variation between different batches. The weight of sand is affected very little by its dampness, which in turn leads to greater accuracy in proportioning materials. A high water/cement ratio increases the workability of concrete. This may be convenient for placing but it should be controlled in order to regulate the final concrete strength. Concrete is a composite with many variables, represented by numerous gradings that indicate components, quality and manufacturing control. The quality of concrete should be monitored, especially to ensure uniformity of mix components and consistency of batches.
