ACI Certification- Concrete Field Testing Technician Grade 1 CP-1
(12)
ASTM C1064 - What is the standard test method designated for measuring the temperature of freshly mixed
hydraulic-cement concrete?
ASTM C1064 addresses the Standard Test Method for the temperature of freshly mixed hy...
ACI Certification- Concrete Field Testing Technician Grade 1 CP-1
(12)
ASTM C1064
- What is the standard test method designated for measuring the temperature of freshly mixed
hydraulic-cement concrete?
ASTM C1064 addresses the Standard Test Method for the temperature of freshly mixed hydraulic-
cement concrete.
- How deeply must the sensor of the temperature measuring device be submerged in the concrete?
The sensor must be submerged a minimum of 3 inches into the freshly mixed concrete.
- What range and accuracy requirements must the temperature measuring device meet?
The device must have the capability to measure the temperature of freshly mixed concrete within ±1
degree Fahrenheit across a range of 30 degrees to 120 degrees Fahrenheit.
- How often should the temperature measuring device be calibrated?
Calibration of the device should occur annually, or whenever there are questions regarding its
accuracy.
- Is it acceptable to measure the temperature of concrete in a wheelbarrow?
True. The temperature can be measured in a wheelbarrow.
- Can the temperature be assessed while the concrete is in a wall form?
True. Temperature measurement is permissible within wall forms.
- What preparation is necessary for the sample container before concrete sampling?
The sample container must be dampened with water prior to collecting the concrete.
,- What action should be taken around the temperature measuring device after it has been submerged
into the fresh concrete?
The surrounding concrete must be gently pressed to close off any air voids around the device.
- For how long should the temperature measuring device remain in the freshly mixed concrete?
The device must remain in the concrete for a minimum of two minutes and a maximum of five minutes.
- To what precision should the concrete temperature be reported?
The temperature should be reported to the nearest degree Fahrenheit (1°F).
- Does ASTM C1064 stipulate a maximum allowable temperature for freshly mixed concrete?
False. There is no specified maximum temperature for freshly mixed concrete in ASTM C1064.
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ASTM C172
- What is the purpose of ASTM C172?
It is the Standard Practice for Sampling Freshly Mixed Concrete.
- When is sampling required according to this method?
Sampling is mandated when tests are necessary to determine compliance with specification
requirements.
- What types of mixers does this method cover for sampling?
This method encompasses sampling from four types of mixers: stationary mixers, paving mixers,
revolving drum mixers, and open top mixers.
- What is the maximum allowable time between the initial and final portions of a composite sample?
The maximum time permitted is 15 minutes.
, - Should portions of a composite sample be thoroughly remixed before testing?
True. Composite sample portions must be completely remixed prior to beginning any tests.
- How much time is allowed between collecting the final portion of the composite sample and
commencing tests for slump, temperature, and air content?
A maximum of 5 minutes is allowed before starting these tests.
- Within what timeframe should strength test specimens be molded after preparing the composite
sample?
Molding must begin within 15 minutes after fabricating the composite sample.
- What should be done to prevent issues with the concrete sample?
The concrete sample must be safeguarded against contamination and rapid evaporation.
- What is the minimum sample size required for producing strength test specimens?
The minimum volume needed for strength test specimens is 1 cubic foot.
When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced
intervals during discharge of the middle portion of the batch. ✔️2
The composite sample for a paving mixer must represent a minimum of _____ different portions of the
batch of concrete taken from the pile after discharge. ✔️5
When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____
regularly spaced intervals during discharge of the middle portion of the batch. ✔️2
Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the
mixer at the job site. True or False? ✔️False
The composite sample from a truck mixer must be obtained from the _____ portion of the batch.
✔️middle
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