Volume-Batching of Aggregates:

In volume batching, materials are measured by volume (in liters or cubic meters). For measuring the ingredients of concrete by volume a typical gauge box is used as shown in Figure. These gauge boxes are available in different sizes particularly of 35 litres (i.e. volume of one bag cement) or in multiple of the same.

Figure: Gauge Box for Measuring Volume of Concrete Ingredients

The aggregates in the gauge box should be filled loosely (i.e. without any compaction) and struck off. Table 1 shows the recommended sizes of gauge box for volume batching of aggregates.

Table: Size of Gauge Box v/s Volume

Volume batching is less precise as compared to weigh batching, hence preferred only for minor or less important works, where nominal mix of concrete is used rather than designed mix. In ordinary concrete, the proportions are generally mentioned by volume such as 1 : 2 : 4, 1 : 4 : 8 and so on. Volume of moist sand in a loose condition weighs much less than the same volume of dry sand because of bulking. In case of volume batching of fine aggregates, necessary adjustment must be made for the bulking of fine aggregates.