When placing concrete in California's hot weather conditions, what is the maximum allowable concrete temperature at the time of placement according to CBC standards?
Correct Answer
B) 90°F
CBC Section 1905.13 limits concrete temperature to a maximum of 90°F at placement during hot weather conditions. Higher temperatures can cause rapid moisture loss, reduced workability, increased shrinkage cracking, and potential strength reduction. This limit helps ensure proper hydration and concrete quality in California's warm climate.
Why This Is the Correct Answer
CBC Section 1905.13 caps the concrete temperature at 90°F at the point of placement during hot weather. Exceeding this limit causes accelerated hydration, reduced workability, increased shrinkage cracking, and can lower final compressive strength — all critical concerns given California's warm climate.
Why the Other Options Are Wrong
Option A: 85°F
85°F is more conservative than required but is not the CBC-specified limit. The code allows up to 90°F, making 85°F an unnecessary restriction that is not the correct answer.
Option C: 100°F
100°F is well above the 90°F maximum and would represent a non-compliant placement. Concrete placed at 100°F risks significant quality degradation.
Option D: 95°F
95°F exceeds the 90°F CBC limit. This value is close enough to confuse test-takers but is not compliant with California standards.
Memory Technique
Think of 90°F as the 'body temperature' limit for concrete — just as the human body struggles above ~98°F, concrete struggles above 90°F. It's the threshold before things go wrong.
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