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ACI Exam|156 Questions and Answers|100% Accurately Solved
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ACI Exam|156 Questions and Answers|100% Accurately Solved
The end of the thermometer is submerged a minimum of __________ int the
freshly mixed concrete - -3 inches (75 mm)
-The thermometer shall be capable of accurately measuring the temp of
freshly mixed concrete to the _____________ throughout a range of
________________________ degrees. - -+ or - 1 degree F
30 -120 degrees F
-The thermometer shall be verified ______________ or whenever the there is a
question of _______________. - -annually
accuracy
-The temp of concrete can be measured in a wheelbarrow (T or F) - -True
-The temp of concrete can be measured in a wall form (T or F) - -T
-A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temperature (T or F) - -F
-What must be done to the sample container prior to sampling the concrete?
- -Dampened (with water)
-What must be done to the concrete surrounding the thermometer after the
device is submerged in the fresh concrete? - -Gently press the concrete
around the temperature measuring device at the surface of the concrete
-How long must the thermometer remain in the freshly mixed concrete? - -
min of 2 mins - max of 5 mins
-After the temperature of the concrete is read, what is then required? - -
Record it/ Reporting of temperature
-The temp of concrete is reported to the nearest _______? - -1 degree F
-According to test method c1064/c1064m, what is one reason to take the
temp of concrete? - -Verify conformance to a specified requirement for the
temp of concrete
-A max temp of freshly mixed concrete is specified in test method
c1064/c1064m (T or F) - -False
, -The sample of concrete used for temperature determination must be
rodded 25 times (T or F) - -False
-Process of Testing Temperature of Concrete: - -1. Place thermometer in
concrete at least &5 mm deep (3 inches).
2. Press concrete around the thermometers so there are no voids
3. Leave device in concrete for at least 2 mins and max of 5 mins
4. Read and record the temp to the nearest .5 degree C (1 degree F)
5. Record
-You can remove the thermometer when reading the temp. (T or F) - -False
-Sampling by this practice 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. - -Compliance
-This practice covers sampling from 5 types of equipment, which are _______,
__________, ___________, __________, ___________ . - -Stationary , paving,
revolving drum, continuous, and open top mixers
-The elapsed time between obtaining the first and final portions of a
composite sample shall not exceed ______________. - -15 mins
-Portions of a composite sample shall be thoroughly remixed before
beginning tests on the sample. (T or F) - -True
-Start tests for slump , temp, and air content within __________ after
obtaining the final portion of the composite sample. - -5 mins
-Start molding specimens for strength tests within ________ after fabricating
the composite sample. - -15 mins
-The concrete sample must be protected from contamination and ________. -
-Rapid evaporation
-The minimum size sample for making strength test specimens is __________.
- -28 L ( 1 cubic ft)
-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
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