Final answer:
The equivalent slump range for lightweight concrete, where normal-weight concrete requires a slump of 3 to 5 inches, is 3 to 4 inches. This ensures effective placement and compaction of the lightweight concrete.
Step-by-step explanation:
The question is about the slump measure used in the context of lightweight concrete. The slump test is a means of assessing the consistency and workability of the concrete mix. For lightweight concrete that can be placed under conditions that would normally require a slump of 3 to 5 inches for normal-weight concrete, the equivalent slump range typically used is 3 to 4 inches.
It is crucial to choose the correct slump range to ensure that the concrete can be effectively placed and compacted without compromising its strength or durability.