If an aggregate sample weighs more than 100 lbs, what must be done before it is quartered?

Before quartering an aggregate sample that weighs more than 100 lbs, it is essential to mix and cone the material. This step ensures that the sample is homogeneous and accurately represents the overall material being tested. By mixing the sample thoroughly and forming it into a conical pile, you facilitate even distribution of particle sizes and characteristics throughout the sample.

This procedure is crucial because an improperly mixed sample can lead to skewed results in testing, which may not reflect the actual properties of the entire batch. Therefore, achieving a representative sample is vital for reliable testing and analysis in quality control processes.