CPSI-ASTM Study Questions and All
Actual Answers.
The end of the temperature sensing portion of the TMD is submerged a minimum of ___ mm
[ ___ in.] into the freshly mixed concrete - Answer 75mm; 3 in
The TMD shall be capable of accurately measuring the temperature of freshly mixed concrete to
±___°C [ ±___°F] throughout a range of ___ °C [___°F] - Answer 0.5°C; 1°F
0-50°C; 30-120°F
The TMD shall be verified ___, or whenever there is a question of ___ - Answer Annually;
Accuracy
The TMD of concrete may be measured in a wheelbarrow (T/F) - Answer True
The TMD of concrete may be measured in a wall form (T/F) - Answer True
A composite sample of concrete is required even if the only purpose is to determine
temperature (T/F) - Answer False
What must be done to the container before sampling concrete? - Answer Dampen with water
What must be done to the concrete surrounding the TMD after it is submerged in the concrete?
- Answer Gently press around at surface of concrete
How long must TMD remain in freshly mixed concrete? - Answer Between 2 and 5 minutes
After temperature is read, what is required? - Answer Report the temperature
The temperature is reported to the nearest ___°C [___°F] - Answer 0.5°C; 1°F
According to ASTM C1064, what is one reason to take the remp of concrete - Answer Verify
conformance to a specified requirement for temperature of concrete
A maximum temperature of freshly mixed concrete is specified in ASTM C1064 (T/F) - Answer
False
, The sample of concrete used for temperature must be rodded 25 times (T/F) - Answer False
Sampling by this practice (C172 - Sampling Freshly Mixed Concrete) covers procedures for
obtaining representative samples, on which tests are to be performed to determine ___ with
quality requirements of the specifications under which the concrete is furnished - Answer
Compliance
This practice (C172 - Sampling Freshly Mixed Concrete) covers sampling from fives types of
equipment, which are... - Answer 1. Stationary Mixers
2. Paving Mixers
3. Revolving Drum Mixers/Agitators
4. Continuous Mixers
5. Open-Top Mixers
The elapsed time between obtaining the first and final portions of a composite sample shall not
exceed ___ min - Answer 15
Portions of a composite sample shall be thoroughly remixed before beginning tests on the
sample (T/F) - Answer True
Start tests for slump, temp, and air content within ___ minutes after obtaining the final portion
of the composite sample - Answer 5
Start molding specimens strength tests within ___ minutes after fabricating composite sample?
- Answer 15
The concrete sample must be protected from contamination and ___ - Answer Rapid
Evaporation
The minimum size sample for making strength test specimens is ___ - Answer 28 L (1ft³)
When sampling from a stationary mixer, the batch must be samples at ___ or more regularly
spaced intervals during discharge of the middle portion of the batch - Answer 2
When sampling from a paving mixer, obtain samples from at least ___ different portions of the
pile and combine them into one composite sample - Answer 5
Actual Answers.
The end of the temperature sensing portion of the TMD is submerged a minimum of ___ mm
[ ___ in.] into the freshly mixed concrete - Answer 75mm; 3 in
The TMD shall be capable of accurately measuring the temperature of freshly mixed concrete to
±___°C [ ±___°F] throughout a range of ___ °C [___°F] - Answer 0.5°C; 1°F
0-50°C; 30-120°F
The TMD shall be verified ___, or whenever there is a question of ___ - Answer Annually;
Accuracy
The TMD of concrete may be measured in a wheelbarrow (T/F) - Answer True
The TMD of concrete may be measured in a wall form (T/F) - Answer True
A composite sample of concrete is required even if the only purpose is to determine
temperature (T/F) - Answer False
What must be done to the container before sampling concrete? - Answer Dampen with water
What must be done to the concrete surrounding the TMD after it is submerged in the concrete?
- Answer Gently press around at surface of concrete
How long must TMD remain in freshly mixed concrete? - Answer Between 2 and 5 minutes
After temperature is read, what is required? - Answer Report the temperature
The temperature is reported to the nearest ___°C [___°F] - Answer 0.5°C; 1°F
According to ASTM C1064, what is one reason to take the remp of concrete - Answer Verify
conformance to a specified requirement for temperature of concrete
A maximum temperature of freshly mixed concrete is specified in ASTM C1064 (T/F) - Answer
False
, The sample of concrete used for temperature must be rodded 25 times (T/F) - Answer False
Sampling by this practice (C172 - Sampling Freshly Mixed Concrete) covers procedures for
obtaining representative samples, on which tests are to be performed to determine ___ with
quality requirements of the specifications under which the concrete is furnished - Answer
Compliance
This practice (C172 - Sampling Freshly Mixed Concrete) covers sampling from fives types of
equipment, which are... - Answer 1. Stationary Mixers
2. Paving Mixers
3. Revolving Drum Mixers/Agitators
4. Continuous Mixers
5. Open-Top Mixers
The elapsed time between obtaining the first and final portions of a composite sample shall not
exceed ___ min - Answer 15
Portions of a composite sample shall be thoroughly remixed before beginning tests on the
sample (T/F) - Answer True
Start tests for slump, temp, and air content within ___ minutes after obtaining the final portion
of the composite sample - Answer 5
Start molding specimens strength tests within ___ minutes after fabricating composite sample?
- Answer 15
The concrete sample must be protected from contamination and ___ - Answer Rapid
Evaporation
The minimum size sample for making strength test specimens is ___ - Answer 28 L (1ft³)
When sampling from a stationary mixer, the batch must be samples at ___ or more regularly
spaced intervals during discharge of the middle portion of the batch - Answer 2
When sampling from a paving mixer, obtain samples from at least ___ different portions of the
pile and combine them into one composite sample - Answer 5
