During a concrete pour in Florida's hot climate, the concrete temperature reaches 95°F. What is the most appropriate action to take?
Correct Answer
C) Add ice to the concrete mix to reduce temperature
ACI 305 recommends keeping concrete temperature below 90°F in hot weather. Adding ice to the mix is a standard method to reduce concrete temperature during hot weather placement.
Why This Is the Correct Answer
According to ACI 305 (Hot Weather Concreting), concrete temperature should be kept below 90°F to prevent rapid setting, increased water demand, and reduced workability. At 95°F, the concrete exceeds this limit and requires immediate temperature reduction. Adding ice to the concrete mix is a standard and effective method recommended by ACI 305 to quickly lower concrete temperature during hot weather placement. This allows the pour to continue safely while maintaining proper concrete properties.
Why the Other Options Are Wrong
Option A: Stop the pour and wait for cooler weather
Adding water increases the water-cement ratio, which significantly reduces concrete strength and durability, and doesn't effectively address the temperature problem
Option B: Continue pouring as normal since this is within acceptable limits
Stopping the pour entirely is unnecessarily extreme when effective temperature reduction methods like adding ice are available and can solve the problem immediately
Option D: Increase the water content to improve workability
95°F exceeds the ACI 305 recommended maximum temperature of 90°F for concrete in hot weather conditions, so continuing as normal would compromise concrete quality
Memory Technique
Think 'ICE-90': when concrete hits 90°F or above, add ICE to bring it back down
Reference Hint
ACI 305 - Hot Weather Concreting, Chapter on temperature control methods
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