ACI Grade 1 Field Testing Certification Practice Test - Irving
Concrete Temperature Measurement and Sampling Guidelines
1. Is it true that for fresh concrete with aggregates less than 3 inches, the thermometer must remain for
a minimum of 5 minutes or until the reading stabilizes?
False. The correct duration is between 2 to 5 minutes.
2. Is the temperature measuring device required to be accurate to within 0.1 degree?
False. The accuracy requirement is typically ±0.5°C (±1°F) for most applications.
3. What is the temperature range that a measuring device must cover for freshly mixed concrete?
The device should measure temperature in a range of 30 to 120 degrees Fahrenheit (0 to 50 degrees
Celsius).
4. Is a composite sample necessary if only measuring temperature?
True. However, the composite sample is typically needed for more thorough testing.
5. Must the temperature of fresh concrete be measured by inserting the thermometer into the top six
inches of concrete?
False. The thermometer must be inserted into the top 3 inches of the concrete.
6. To what precision is the temperature of the concrete recorded?
The temperature is recorded to the nearest 1 degree Fahrenheit (0.5 degree Celsius).
7. According to ASTM C1064, does the container used for measuring concrete temperature need to
allow for at least 5 inches of concrete around the sensor?
True.
8. How often should the temperature measuring device be calibrated?
It should be calibrated at least annually or whenever there are concerns regarding its accuracy.
, 9. What should be done to the concrete surrounding the thermometer after it has been placed?
The concrete should be gently pressed around the thermometer.
10. What is one reason stated in ASTM C1064 for measuring the temperature of concrete?
To verify conformance to specific requirements.
11. Is it acceptable to remove the temperature measuring device from concrete to see the reading?
False. The device should remain submerged to ensure an accurate reading.
12. Is the maximum time between obtaining the first and last portions of the composite sample limited
to 5 minutes?
False. This time limit may vary and is typically 15 minutes.
13. Should molding of specimens for strength tests occur within 30 minutes after preparing the
composite sample?
False. The molding must occur within 15 minutes.
14. Must the composite concrete sample be protected from factors such as sun, wind, contamination,
and rapid evaporation?
False. Protection is required only from contamination and rapid evaporation.
15. If the concrete contains aggregates larger than those suitable for the size of the mold or equipment,
should the sample be wet-sieved before testing?
False. The proper term is that the sample should be wet screened.
16. Should the composite sample be remixed before beginning any tests?
False. The sample should be thoroughly remixed.
17. Should sampling typically occur while the concrete is being discharged from the mixer?
Concrete Temperature Measurement and Sampling Guidelines
1. Is it true that for fresh concrete with aggregates less than 3 inches, the thermometer must remain for
a minimum of 5 minutes or until the reading stabilizes?
False. The correct duration is between 2 to 5 minutes.
2. Is the temperature measuring device required to be accurate to within 0.1 degree?
False. The accuracy requirement is typically ±0.5°C (±1°F) for most applications.
3. What is the temperature range that a measuring device must cover for freshly mixed concrete?
The device should measure temperature in a range of 30 to 120 degrees Fahrenheit (0 to 50 degrees
Celsius).
4. Is a composite sample necessary if only measuring temperature?
True. However, the composite sample is typically needed for more thorough testing.
5. Must the temperature of fresh concrete be measured by inserting the thermometer into the top six
inches of concrete?
False. The thermometer must be inserted into the top 3 inches of the concrete.
6. To what precision is the temperature of the concrete recorded?
The temperature is recorded to the nearest 1 degree Fahrenheit (0.5 degree Celsius).
7. According to ASTM C1064, does the container used for measuring concrete temperature need to
allow for at least 5 inches of concrete around the sensor?
True.
8. How often should the temperature measuring device be calibrated?
It should be calibrated at least annually or whenever there are concerns regarding its accuracy.
, 9. What should be done to the concrete surrounding the thermometer after it has been placed?
The concrete should be gently pressed around the thermometer.
10. What is one reason stated in ASTM C1064 for measuring the temperature of concrete?
To verify conformance to specific requirements.
11. Is it acceptable to remove the temperature measuring device from concrete to see the reading?
False. The device should remain submerged to ensure an accurate reading.
12. Is the maximum time between obtaining the first and last portions of the composite sample limited
to 5 minutes?
False. This time limit may vary and is typically 15 minutes.
13. Should molding of specimens for strength tests occur within 30 minutes after preparing the
composite sample?
False. The molding must occur within 15 minutes.
14. Must the composite concrete sample be protected from factors such as sun, wind, contamination,
and rapid evaporation?
False. Protection is required only from contamination and rapid evaporation.
15. If the concrete contains aggregates larger than those suitable for the size of the mold or equipment,
should the sample be wet-sieved before testing?
False. The proper term is that the sample should be wet screened.
16. Should the composite sample be remixed before beginning any tests?
False. The sample should be thoroughly remixed.
17. Should sampling typically occur while the concrete is being discharged from the mixer?
