During the quartering process, how many times should the sample be turned over?

During the quartering process, the sample should be turned over four times to ensure thorough mixing and representation of the material. This procedure breaks up any clumps and allows for an even distribution of the aggregate particles, which is critical for obtaining a reliable sample for testing. Each quartering movement helps to eliminate bias by ensuring that all portions of the sample are evenly mixed and that no single area dominates the sample. This methodical approach is essential for quality control in aggregate testing, ensuring that the sample evaluated reflects the true characteristics of the bulk material being tested.