What is involved in the specific gravity test on aggregates?

The specific gravity test on aggregates primarily involves comparing the weights of aggregates in air and water. This method is based on Archimedes' principle, which states that an object submerged in fluid will experience a loss of weight equal to the weight of the fluid displaced. By measuring the weight of the aggregate in air and then weighing it when submerged in water, one can determine the volume of the aggregate.

This volume is crucial in calculating the specific gravity, which is a dimensionless quantity that helps assess the density of the aggregate relative to the density of water. The results from this test are important for various applications, including evaluating the material's suitability for construction projects and understanding how aggregate will behave in terms of compaction and stability.

Other options, while related to aggregate testing, do not accurately describe the specific gravity test. Measuring the size of aggregate particles focuses on gradation analysis, calculating volume is part of the methodology but not the main objective of the test itself, and determining moisture content pertains to a different aspect of aggregate testing.