What is the acceptable tolerance for concrete slump when the specification calls for 4-inch slump?
Correct Answer
C) ±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: ±1 inch
±1 inch exceeds the ACI standard tolerance and could compromise concrete quality and consistency
Option B: ±1.5 inches
±1.5 inches is far too permissive and would allow unacceptable variation that could affect structural performance
Option D: ±0.5 inch
±0.5 inch is too restrictive and not the standard ACI tolerance for 4-inch slump specifications
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
More Contract Admin Questions
A project experiences a 30-day delay due to unusually severe weather. The contract includes a liquidated damages clause of $1,000 per day for delays. If the weather delay is excusable but not compensable, what liquidated damages apply?
A commercial project requires a total of 12 inspections. The building department charges $85 per inspection for the first 5 inspections, $65 for inspections 6-10, and $45 for any additional inspections. What is the total inspection fee?
What document must be posted at the job site before a Certificate of Occupancy can be issued for a commercial building?
A mixed-use development requires a variance for reduced setbacks. The property is located within 500 feet of a hospital. What additional consideration must be addressed?
A LEED project requires tracking of regional materials. Materials are considered regional if they are extracted, harvested, or recovered, as well as manufactured within what distance of the project site?
An indemnification clause in a construction contract typically requires the contractor to:
A property owner wants to convert a single-family home into a duplex in an area zoned for single-family residential use. The conversion meets all building codes but violates density requirements. What approval is needed?
As-built drawings are typically required to be submitted:
AIA Document A401 is primarily used for:
A general contractor is building a 12,000 square foot commercial warehouse. The building permit fee is calculated at $8.50 per $1,000 of construction value. If the project value is $2,400,000, what is the building permit fee?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Project Management
60 questions · 70% to pass
Related Study Resources
Previous Question
A General Contractor is planning a commercial building project valued at $2.5 million. The building permit fee is calculated at $8.50 per $1,000 of construction value. What is the total permit fee?
Next Question
Under Florida Statute Chapter 489, which license classification allows a contractor to perform work on buildings of unlimited size and cost?