What is the acceptable tolerance for concrete slump when the specification calls for 4-inch slump?
Correct Answer
B) ±0.75 inch
ACI standards typically allow a tolerance of ±0.75 inch for specified slumps of 4 inches or less, ensuring the concrete maintains its designed workability and strength characteristics.
Why This Is the Correct Answer
According to ACI (American Concrete Institute) standards, the acceptable tolerance for concrete slump when the specification calls for 4 inches or less is ±0.75 inch. This tolerance ensures that the concrete maintains its designed workability, consistency, and strength characteristics while allowing for reasonable variation in field conditions. The ±0.75 inch tolerance provides adequate flexibility for contractors while maintaining quality control standards required for structural integrity.
Why the Other Options Are Wrong
Option A: ±0.5 inch
±0.5 inch is too restrictive and not the standard ACI tolerance for 4-inch slump specifications
Option C: ±1 inch
±1 inch exceeds the ACI standard tolerance and could compromise concrete quality and consistency
Option D: ±1.5 inches
±1.5 inches is far too permissive and would allow unacceptable variation that could affect structural performance
Memory Technique
Think '3/4 for 4' - three-quarters inch tolerance (0.75) for 4-inch slump specifications
Reference Hint
ACI 301 (Specifications for Structural Concrete) or ACI 318 (Building Code Requirements for Structural Concrete) - Chapter on Quality Control and Testing
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