Which statement about sample reduction is true?

Which statement about sample reduction is true?

• A. The split test sample portion must be of different character than the field sample.
• B. The split test sample portion must be of the same size as the field sample.
• C. The split test sample portion must have a character similar to the field sample.
• D. The split test sample portion should be discarded.

Answer: (C)

The key idea is that any reduced portion used for lab testing must accurately represent the field sample. When you split a field sample, you want the lab portion to have the same characteristics as the material you collected in the field—same gradation, binder content tendency, moisture, temperature, and overall composition—so the test results truly reflect how the material will behave in service. If the split portion differed in character, the lab results would not reliably predict field performance. The size of the split portion isn’t the crucial point; it’s that what you test is representative of the field material. Discarding a portion isn’t appropriate because you need a portion that can be tested to verify properties.

The key idea is that any reduced portion used for lab testing must accurately represent the field sample. When you split a field sample, you want the lab portion to have the same characteristics as the material you collected in the field—same gradation, binder content tendency, moisture, temperature, and overall composition—so the test results truly reflect how the material will behave in service. If the split portion differed in character, the lab results would not reliably predict field performance. The size of the split portion isn’t the crucial point; it’s that what you test is representative of the field material. Discarding a portion isn’t appropriate because you need a portion that can be tested to verify properties.