How often should gradation tests be done on coarse aggregates?

The recommended frequency for conducting gradation tests on coarse aggregates is once every 800 cubic yards. This guideline is established to ensure that the quality and characteristics of the coarse aggregates used in concrete or other construction materials consistently meet specified standards.

By performing gradation tests at this interval, it is possible to monitor the size distribution of the aggregates over time, which is critical for achieving the desired properties of the mixture, such as workability, strength, and durability. This frequency strikes an appropriate balance between ensuring quality control and managing testing resources effectively.

Although other frequencies mentioned could be plausible in different contexts, they may not provide the same level of oversight and reliability in monitoring the aggregate's gradation, which is pivotal in maintaining the integrity of construction materials.