During delivery, which observation most clearly indicates possible segregation?

Study for the ACI Concrete Transportation Inspector Test with interactive flashcards and multiple choice questions. Each question provides detailed hints and explanations to ensure thorough understanding. Prepare effectively for your certification exam!

Multiple Choice

During delivery, which observation most clearly indicates possible segregation?

Explanation:
Segregation means the components of the concrete are separating during handling, with the heavier coarse aggregate tending to separate from the cement paste. The clearest sign of this during delivery is a rough surface with exposed aggregate—your surface shows larger particles sticking out, indicating the paste has moved away from them and the aggregates have segregated toward or to the surface. A uniform surface would suggest the mix stayed evenly distributed, while seeing all cement paste or no fines at discharge are not as direct or consistent indicators of segregation in practice.

Segregation means the components of the concrete are separating during handling, with the heavier coarse aggregate tending to separate from the cement paste. The clearest sign of this during delivery is a rough surface with exposed aggregate—your surface shows larger particles sticking out, indicating the paste has moved away from them and the aggregates have segregated toward or to the surface. A uniform surface would suggest the mix stayed evenly distributed, while seeing all cement paste or no fines at discharge are not as direct or consistent indicators of segregation in practice.

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