For concrete slump testing in California, what is the acceptable slump range for normal weight concrete used in residential foundation work when no specific slump is specified in the project documents?
Correct Answer
A) 3 to 6 inches
According to ACI 318 as adopted by the CBC, normal weight concrete typically has an acceptable slump range of 3 to 6 inches for general construction when not otherwise specified. This range provides adequate workability for proper placement and consolidation while maintaining structural integrity required by California's stringent seismic design requirements.
Why This Is the Correct Answer
ACI 318 as adopted by the CBC specifies a slump range of 3 to 6 inches as acceptable for normal weight concrete in general construction when no specific slump is designated. This range balances workability (to allow proper placement and consolidation) with structural integrity (avoiding excessive water that reduces strength).
Why the Other Options Are Wrong
Option B: 1 to 3 inches
1 to 3 inches is too stiff for typical residential foundation work. This low-slump range is used for concrete placed by slip-form pavers or other specialized equipment, not standard footing and foundation pours.
Option C: 2 to 4 inches
2 to 4 inches is a subset of the correct range and represents more conservative workability. While concrete in this range is acceptable, it does not define the full acceptable range — slumps up to 6 inches are also permitted.
Option D: 4 to 8 inches
4 to 8 inches allows slumps up to 8 inches, which is too wet for standard structural work. High-slump concrete (above 6 inches) typically requires water-reducing admixtures and special engineering approval; it is not the standard range for residential foundations.
Memory Technique
Think '3 to 6 like a clock face' — the minute hand at 3 o'clock and 6 o'clock bracket the acceptable slump zone. If your slump falls between 3 and 6 inches, you're 'on time' with the code.
More trade-general-building Questions
When installing engineered lumber joists (I-joists) in California residential construction, what is the primary code requirement for web stiffeners?
What is the required attic ventilation ratio when a vapor retarder is installed on the warm-in-winter side of the ceiling according to the California Residential Code?
In California's Wildland-Urban Interface (WUI) areas, which underlayment requirement applies to Class A fire-rated roof assemblies?
In California, when installing a tankless water heater in a seismic zone, what additional requirement must be met beyond standard installation practices?
According to the California Building Code (CBC), what is the minimum lap splice length for #4 rebar in a concrete foundation wall in normal weight concrete with f'c = 3000 psi?
According to CBC requirements for retaining walls in California, what additional design consideration must be addressed for retaining walls over 4 feet in height located in seismic design categories D, E, and F?
When constructing retaining walls in California that exceed 4 feet in height, which CBC requirement must be met regarding drainage?
Under California regulations, when is a reduced pressure principle (RPP) backflow prevention assembly required for a residential water service connection?
Under California Title 24, what is the minimum electrical service size required for new single-family residential construction?
According to the California Building Code, buildings located in Seismic Design Category D must comply with which specific seismic design requirements?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass