During earthwork operations, what is the standard compaction requirement for structural fill under foundations in Florida?
Correct Answer
A) 95% of standard Proctor density
Florida Building Code typically requires structural fill under foundations to achieve 95% of standard Proctor density to ensure adequate support and minimize settlement. This is verified through field density testing during construction.
Why This Is the Correct Answer
The Florida Building Code requires structural fill under foundations to achieve 95% of standard Proctor density to provide adequate bearing capacity and minimize differential settlement. This compaction level ensures the soil has sufficient density and strength to support structural loads safely. The 95% requirement balances practical construction considerations with engineering performance needs. Field density testing is mandatory to verify compliance with this standard.
Why the Other Options Are Wrong
Option C: 98% of standard Proctor density
98% compaction exceeds the standard requirement and would be unnecessarily difficult and expensive to achieve in typical construction, making it impractical for standard structural fill applications.
Option D: 90% of standard Proctor density
85% compaction is insufficient for structural fill under foundations as it would not provide adequate bearing capacity and could lead to excessive settlement under structural loads.
Memory Technique
Use '95 for Foundations to Stay Alive' - the 95% compaction keeps foundations from settling and failing
Reference Hint
Florida Building Code Chapter 18 - Soils and Foundations, specifically sections on earthwork and compaction requirements
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