ACI Concrete Field Testing Technician - Grade I
Temperature Measurement of Freshly Mixed Concrete - What is the minimum depth the sensing end of the temperature measuring device should be
submerged in freshly mixed concrete?
The end of the temperature sensing part must be submerged at least...
- What is the minimum depth the sensing end of the temperature measuring device should be
submerged in freshly mixed concrete?
The end of the temperature sensing part must be submerged at least 77 mm (3 in.) into the concrete.
- What is the accuracy and range requirement for the temperature measuring device?
The device must accurately measure the temperature of freshly mixed concrete to within ±0.5°C (±1°F)
over a range of 0-50°C.
- How often should the temperature measuring device be verified?
Verification of the temperature measuring device should occur annually or whenever there are
questions regarding its accuracy.
- Is it true that the temperature of concrete can be measured while it is in a wheelbarrow?
True. The temperature can indeed be assessed in a wheelbarrow.
- Can the temperature be measured in a wall form?
True. It is permissible to measure the temperature of concrete within a wall form.
- Is a composite sample necessary if the sole purpose is to measure temperature?
False. A composite sample is not required just for temperature determination.
- What preparation is needed for the sample container before sampling?
The sample container must be dampened with water before the concrete is collected.
- What should be done to the concrete around the temperature measuring device after it has been
submerged?
, The concrete at the surface around the device should be gently pressed to ensure proper contact.
- For how long must the temperature measuring device stay in the concrete for accurate measurement?
The device should remain in the freshly mixed concrete for at least 2 minutes, but no more than 5
minutes.
- What must be done after the concrete temperature is measured?
The temperature must be reported following the measurement.
- To what degree of precision should the concrete temperature be recorded?
The temperature is reported to the nearest 1 degree Fahrenheit.
- What is one reason given in ASTM C1064 for measuring concrete’s temperature?
One key reason is to verify compliance with specific requirements.
- Does ASTM C1064 specify a maximum allowable temperature for freshly mixed concrete?
False. There is no maximum temperature limit specified in ASTM C1064.
- Is it correct that a sample of concrete used for temperature evaluation must be rodded 25 times?
False. There is no requirement for the sample to be rodded 25 times for temperature measurement.
Sampling Procedures for Freshly Mixed Concrete
- What is the purpose of sampling according to ASTM C172?
The methods included aim to obtain representative samples for testing compliance with quality
requirements of the relevant specifications.
- From what types of mixers does this method cover sampling procedures?
It applies to stationary mixers, paving mixers, revolving drum mixers, and open top mixers.
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