When placing concrete in hot weather conditions per CBC Section 1906.12, what is the maximum concrete temperature allowed at the time of placement in California?
Correct Answer
A) 95°F
CBC Section 1906.12 limits concrete temperature to 95°F at placement during hot weather conditions. This limit prevents rapid moisture loss and ensures proper hydration and strength development, which is particularly important in California's hot, dry climate conditions.
Why This Is the Correct Answer
CBC Section 1906.12 specifies a maximum concrete placement temperature of 95°F for hot weather conditions. This section covers a slightly different scope than Section 1905.12 (which limits to 90°F). The 95°F threshold under Section 1906.12 still prevents the most serious hot-weather problems — accelerated hydration, reduced workability, plastic shrinkage cracking — while accommodating the practical realities of California's climate.
Why the Other Options Are Wrong
Option B: 90°F
90°F is the limit specified under CBC Section 1905.12, not Section 1906.12. This is the most likely trap in this question. Both limits are real CBC requirements, but they apply to different sections. The question explicitly references Section 1906.12, making 95°F the correct answer.
Option C: 85°F
85°F is more conservative than either CBC section requires. While placing concrete at lower temperatures always improves quality, the code does not mandate an 85°F limit under Section 1906.12. This answer reflects a misremembering of the threshold.
Option D: 100°F
100°F is too high for structural concrete placement under any CBC section. At this temperature, flash setting and severe strength reduction become likely. No standard code provision permits 100°F as a maximum for structural placements.
Memory Technique
Use a section-to-temperature anchor: '1905 → 90°F' and '1906 → 95°F.' The higher section number (1906) corresponds to the higher temperature (95°F). Think of it as a progression: one step up in the code, one step up in temperature.
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