When conducting a slump test for concrete in California, what is the acceptable slump range for a typical residential foundation pour with normal weight aggregate?
Correct Answer
D) 3 to 6 inches
According to CBC Section 1905.6 and ACI 301 standards referenced by California, typical slump for foundation concrete should be 3 to 6 inches. This range provides adequate workability for placement while maintaining proper strength characteristics. Lower slumps may cause placement difficulties, while higher slumps can reduce strength.
Why This Is the Correct Answer
ACI 301 standards referenced by the CBC specify a slump of 3 to 6 inches for typical foundation concrete. This range provides enough workability to place and consolidate concrete around rebar in forms while maintaining adequate water-cement ratio for target compressive strength.
Why the Other Options Are Wrong
Option A: 4 to 8 inches
4 to 8 inches is too wet for a standard foundation pour. A slump above 6 inches generally indicates excess water, which reduces compressive strength and can cause segregation. High-slump concrete is sometimes used with superplasticizers, but that is a special case.
Option B: 2 to 4 inches
2 to 4 inches is appropriate for pavements or slabs requiring low permeability but is too stiff for typical residential foundation work where placement around dense rebar requires more workability.
Option C: 1 to 3 inches
1 to 3 inches is a very stiff mix suitable for precast elements or slip-form paving — not for a residential foundation poured in place. Such a low slump would be very difficult to consolidate and could leave voids.
Memory Technique
Foundation slump: 3 to 6 — not too wet, not too stiff. Think of pouring thick oatmeal (too stiff = 1–3 inches) versus soup (too wet = 6–8 inches). Foundation concrete should flow like thick batter: 3 to 6 inches.
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