When conducting a slump test for concrete in California, what is the standard height of the slump cone according to ASTM C143 as referenced in the CBC?
Correct Answer
D) 12 inches
The standard slump cone specified in ASTM C143, which is referenced in CBC Section 1905.6.1, has a height of 12 inches. This standardized test measures concrete consistency and workability, which is critical for quality control in California construction projects.
Why This Is the Correct Answer
ASTM C143, referenced in CBC Section 1905.6.1, specifies a slump cone that is exactly 12 inches tall. This standardized dimension ensures consistent, reproducible measurements of concrete workability and consistency across all California construction projects.
Why the Other Options Are Wrong
Option A: 8 inches
8 inches is not the specified cone height. This value might be confused with other concrete testing dimensions, but ASTM C143 is explicit that the cone must be 12 inches tall.
Option B: 14 inches
14 inches exceeds the ASTM C143 requirement. No standard slump cone is 14 inches; this option is a distractor with no code basis.
Option C: 10 inches
10 inches is not specified by ASTM C143. It may seem like a plausible midpoint, but the standard is fixed at 12 inches to ensure test repeatability.
Memory Technique
Think '4-8-12' for the slump cone: 4-inch top opening, 8-inch base diameter, 12-inch height. The numbers double each time — easy to remember as a doubling sequence.
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