When sampling a fine aggregate stockpile, how many random locations should be sampled with the sampling tube?

When sampling a fine aggregate stockpile, the recommended practice is to collect samples from five or more random locations using the sampling tube. This approach is crucial because it ensures that the sample is representative of the entire stockpile.

Sampling from multiple random locations decreases the likelihood of bias that could arise from sampling only a few spots, which may not capture the variability in the material. Fine aggregates can exhibit significant variations in properties such as size distribution, moisture content, and cleanliness, depending on the specific area within the stockpile. By taking samples from several locations, the inspector can account for these variations and obtain a more accurate and reliable sample for testing.

This practice aligns with quality control standards, which aim to produce consistent outcomes in construction materials, thereby ensuring that the materials meet the required specifications for their intended use. Collecting a larger number of samples helps in understanding the overall quality of the stockpile and making informed decisions in construction applications.