What is the standard compaction requirement for structural fill under building foundations in Florida?
Correct Answer
C) 95% of Modified Proctor density
Florida Building Code typically requires structural fill to be compacted to 95% of Modified Proctor density. This ensures adequate support for foundations and prevents differential settlement.
Why This Is the Correct Answer
The Florida Building Code requires structural fill under building foundations to be compacted to 95% of Modified Proctor density to ensure adequate bearing capacity and prevent settlement issues. Modified Proctor testing provides a higher energy compaction standard than Standard Proctor, which is necessary for critical structural applications. The 95% threshold represents the industry standard that balances constructability with performance requirements for foundation support.
Why the Other Options Are Wrong
Option A: 90% of Standard Proctor density
90% of Standard Proctor density is insufficient for structural fill applications as it uses the lower energy Standard Proctor test and doesn't meet the minimum compaction requirements for foundation support in Florida.
Option B: 95% of Standard Proctor density
While 95% is the correct percentage, Standard Proctor density uses lower compaction energy than Modified Proctor and is not the standard specified for structural fill under foundations in Florida.
Option D: 98% of Modified Proctor density
98% of Modified Proctor density exceeds the standard requirement and would be unnecessarily difficult and expensive to achieve in typical construction, though it may be specified for special applications.
Memory Technique
Think '95 Modified' - 95% compaction using the Modified (higher energy) Proctor test for structural fill. Remember: Standard is for standard work, Modified is for structural work.
Reference Hint
Florida Building Code Chapter 18 (Soils and Foundations) or geotechnical sections dealing with earthwork and compaction requirements
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