What is the minimum compressive strength typically required for concrete masonry units (CMU) used in load-bearing walls?
Correct Answer
B) 1,900 psi
Standard CMU blocks for load-bearing applications typically require a minimum compressive strength of 1,900 psi. This ensures adequate structural capacity for bearing wall systems in typical construction applications.
Why This Is the Correct Answer
The 1,900 psi compressive strength requirement for load-bearing CMU walls is established by building codes and industry standards to ensure structural integrity. This strength level provides adequate safety factors for typical residential and commercial construction loads. The requirement balances structural performance with cost-effectiveness, making it the standard specification for load-bearing masonry construction. This value is specifically referenced in the Florida Building Code and ASTM standards for concrete masonry units.
Why the Other Options Are Wrong
Option A: 1,500 psi
2,500 psi exceeds the minimum requirement and while it would be acceptable, it represents a higher grade CMU that is more expensive and not typically required for standard load-bearing applications.
Option D: 1,000 psi
1,500 psi falls short of the minimum requirement for load-bearing walls and would not provide adequate structural capacity to safely carry building loads according to code requirements.
Memory Technique
Use the mnemonic '19-LOAD' - 1900 psi for LOAD-bearing walls. The number 19 can remind you of both the strength (1900) and that it's for structural/load-bearing applications.
Reference Hint
Florida Building Code Chapter 21 (Masonry) or ASTM C90 Standard Specification for Loadbearing Concrete Masonry Units
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