When placing concrete in hot weather conditions common in California, what is the maximum concrete temperature allowed at the time of placement according to CBC requirements?
Correct Answer
D) 95°F
CBC Section 1905.13.1 limits concrete temperature to a maximum of 95°F at placement during hot weather conditions. This requirement is particularly important in California's hot inland valleys and desert regions to prevent rapid moisture loss, plastic shrinkage cracking, and reduced long-term strength development.
Why This Is the Correct Answer
CBC Section 1905.13.1 limits concrete temperature to a maximum of 95°F at the time of placement during hot weather. This limit prevents rapid moisture evaporation, plastic shrinkage cracking, and the accelerated hydration that reduces long-term strength — all critical concerns in California's hot inland and desert regions.
Why the Other Options Are Wrong
Option A: 100°F
100°F exceeds the CBC maximum of 95°F for concrete placement temperature. Placing concrete above 95°F risks accelerated setting time, plastic shrinkage cracking, and reduced compressive strength development.
Option B: 90°F
90°F is below the 95°F maximum allowed — it would be an acceptable placement temperature under CBC. However, it is not the maximum limit and is therefore not the correct answer to this question.
Option C: 80°F
80°F is a common ACI reference temperature for hot weather concrete concerns to begin, but it is not the CBC maximum placement temperature. Selecting this answer confuses the 'threshold for concern' with the 'maximum allowed temperature.'
Memory Technique
95°F = '95 is the hot concrete ceiling.' Think of a speed limit: just as 65 mph is the highway maximum, 95°F is the concrete temperature highway — do not exceed it at placement.
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