How is the grading of aggregate determined?

The grading of aggregate is determined by passing the aggregate through a series of sieves and measuring the mass retained on each sieve. This process allows for the classification of the aggregate based on particle size distribution. When the aggregate is subjected to sieving, it is separated into different size fractions, and the amount of material retained on each sieve provides valuable data on the size distribution.

This procedure is critical because the grading affects the engineering properties of the aggregate, such as its compaction, stability, and how it interacts with other materials in a mixture. Proper grading ensures that the aggregate contributes to the desired strength and performance characteristics in construction applications.

Other methods, like measuring moisture content or conducting visual inspections, are important for overall quality control but do not provide a quantitative measure of grading. Similarly, analyzing chemical composition provides information on material characteristics and suitability but does not assess particle size distribution crucial for determining grading.