For concrete compression testing in California, when ambient temperature is expected to exceed 90°F during the first 48 hours after placement, what special CBC requirement applies to cylinder protection?
Correct Answer
B) Cylinders must be shaded and kept moist with wet burlap and plastic covering
CBC Section 1905.6.3.1 and ASTM C31 require special protection for test cylinders in hot weather conditions. Cylinders must be shaded and kept moist with wet burlap and plastic covering when temperatures exceed 90°F. California's hot climate makes this protection essential for accurate strength testing and quality control.
Why This Is the Correct Answer
CBC Section 1905.6.3.1 and ASTM C31 require that test cylinders in hot weather (above 90°F) be shaded and kept moist using wet burlap and plastic covering. This prevents premature drying and elevated temperatures that would skew strength test results upward, ensuring the cylinders accurately reflect in-place concrete performance.
Why the Other Options Are Wrong
Option A: Cylinders must be stored in lime water
Storing cylinders in lime water is a curing method for hardened specimens to prevent carbonation, not a hot weather field protection procedure. Lime water immersion occurs in the lab after initial curing, not on site during the first 48 hours.
Option C: Cylinders must be kept in insulated containers and transported to lab within 24 hours
Insulated containers and 24-hour transport is a cold weather protection procedure, not a hot weather requirement. In cold conditions, insulation prevents freezing; in hot conditions, shading and moisture prevent overheating and drying.
Option D: No special requirements - standard curing applies
Standard curing procedures are insufficient when temperatures exceed 90°F. The CBC explicitly requires enhanced protection under hot weather conditions — 'no special requirements' is never the correct answer when a specific code threshold has been triggered.
Memory Technique
Hot weather = keep cylinders cool and wet, like covering yourself with a wet towel on a hot day. Shade + wet burlap + plastic = your concrete cylinder's 'summer survival kit.'
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