Why are backfill lifts limited in thickness?
Correct Answer
A) Compaction equipment must be able to densify the full lift depth
Compactive effort has a limited effective depth. Lift thickness must suit the soil, moisture, equipment and required density so the whole layer is treated. A dense-looking surface alone does not establish adequate compaction below. Source: https://www.fhwa.dot.gov/engineering/geotech/pubs/05037/08.cfm
Why This Is the Correct Answer
Compactive effort has a limited effective depth. Lift thickness must suit the soil, moisture, equipment and required density so the whole layer is treated. A dense-looking surface alone does not establish adequate compaction below. Source: https://www.fhwa.dot.gov/engineering/geotech/pubs/05037/08.cfm
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On the supplied schematic practice drawing (S-741), what is the sum of the three printed chain dimensions? Use the dimension labels rather than scaling the sloping graphic.
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The specified resilient flooring and adhesive require slab moisture and pH checks before installation. Testing has not been completed, but the crew wants to meet turnover. What should happen?