ACI Concrete Field Testing Technician - Grade I Practice Exam

What is the range for measuring temperature using the temperature measuring device?

1. -10 to 110 degrees F [−23 to 43 degrees C]

2. 30 degrees F to 120 degrees F [0 C to 50 C]

3. 20 degrees F to 100 degrees F [−6.7 C to 37.8 C]

4. 32 to 140 degrees F [0 to 60 degrees C]

The correct answer is: 30 degrees F to 120 degrees F [0 C to 50 C]

The correct answer reflects the appropriate range for measuring temperature that is typically required for concrete field testing. In the context of mixing and pouring concrete, it’s critical to monitor temperature accurately. Concrete can be sensitive to temperature changes, which can affect curing and hydration. The specified range of 30 degrees Fahrenheit to 120 degrees Fahrenheit (0 degrees Celsius to 50 degrees Celsius) encompasses the temperatures that are commonly encountered in field conditions and ensures that concrete performance is optimal. This range allows for adequate monitoring of conditions that could potentially affect the setting and strength of the concrete. Much lower or higher temperatures could lead to issues such as freezing of the water in the mix or accelerated curing, respectively, which emphasizes the importance of this specific temperature measuring range for field personnel.