ACI Concrete Field Testing Technician - Grade I Practice Exam

Question: 1 / 400

In how many layers is the slump mold filled?

1 layer

2 layers

3 layers

The slump mold is typically filled in three layers to assess the consistency of concrete during testing. Each layer is placed and then tamped down with a specific number of strokes to ensure proper compaction. This method helps achieve a more uniform representation of the concrete's workability, providing a consistent basis for measurement. Filling the mold in three layers allows for effective consolidation and minimizes the risk of air pockets, which could lead to inaccurate slump readings. Each layer is also of equal volume to ensure that the slump test remains standardized across different tests and varying concrete mixtures. This is an essential practice in concrete testing to adhere to the guidelines established by the American Society for Testing and Materials (ASTM).

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4 layers

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