ACI Concrete Field Testing Technician - Grade I Practice Exam

In testing concrete temperature, which of the following is a required component?

1. Thermometer

2. Concrete mix design

3. Water ratio

4. Aggregates used

The correct answer is: Thermometer

The required component for testing concrete temperature is a thermometer. This instrument is essential because it provides an accurate measurement of the concrete's temperature at the time of testing. Monitoring the temperature of concrete is crucial, as it directly affects the workability, set time, strength development, and overall performance of the concrete. While other options listed may play important roles in the overall quality and characteristics of the concrete, they are not necessary for simply measuring temperature. The concrete mix design can influence its temperature but does not aid in the act of measurement itself. Similarly, the water ratio and the types of aggregates used can affect the temperature due to variations in thermodynamic properties, yet they are not instruments used to measure temperature. Therefore, the thermometer stands out as the essential tool for this specific testing process.