During concrete placement on a hot summer day (95°F), the concrete temperature reaches 85°F upon delivery. What is the most appropriate immediate action?
Correct Answer
D) Proceed with placement as the temperature is within acceptable limits
Concrete temperatures up to 90°F are generally acceptable for placement. The contractor should focus on proper curing methods rather than rejecting usable concrete.
Why This Is the Correct Answer
Concrete temperature of 85°F is well within acceptable placement limits. Industry standards typically allow concrete temperatures up to 90-95°F for normal placement conditions. At 85°F, the concrete maintains proper workability and setting characteristics. The focus should be on implementing proper curing techniques, adequate moisture retention, and temperature control during the curing process rather than rejecting perfectly usable concrete that meets temperature specifications.
Why the Other Options Are Wrong
Option A: Reject the concrete and order a new batch with chilled water
Rejecting concrete at 85°F is unnecessary and wasteful since this temperature is well below the typical 90-95°F upper limit for concrete placement. This would cause project delays, increased costs, and waste of materials when the concrete is actually suitable for use.
Option B: Place the concrete quickly and increase curing compound application
While quick placement is good practice in hot weather, the concrete temperature at 85°F doesn't require emergency placement procedures. Increasing curing compound application alone doesn't address the perceived temperature concern, which isn't actually a problem at this temperature level.
Option C: Add ice to the concrete mixer to reduce temperature
Adding ice directly to concrete at the job site is dangerous and improper. This can create uneven cooling, affect water-cement ratios, disrupt mix design, and potentially damage the concrete's structural properties. Temperature modifications should be done at the plant, not in the field.
Memory Technique
Remember '90 and Go' - concrete temperatures up to 90°F are generally good to go for placement without special measures.
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