What must be established before weighing a portion of aggregate for gradation testing?

Before weighing a portion of aggregate for gradation testing, it is essential to establish the tare weight of the weigh pan. The tare weight represents the weight of the empty container that will hold the aggregate sample. By knowing this weight, you can accurately calculate the net weight of the aggregate being tested. This is crucial for ensuring that the test results reflect the true weight of the sample without the added weight of the container.

Establishing the tare weight allows for precise measurements, which are vital for maintaining the integrity of the gradation test. Accurate results from the gradation test depend on knowing the exact amount of aggregate being measured, as this impacts calculations of particle size distribution and overall quality control of the aggregate.

While moisture content, sample size, and temperature can all affect the characteristics of aggregate during testing, they do not directly influence the immediate process of weighing the sample. Therefore, knowing the tare weight is fundamental before proceeding with the weighing process.