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ACI Concrete Field Testing Technician- Grade I Exam with complete solutions
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ACI Concrete Field Testing Technician- Grade I Exam with complete solutions
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ACI Concrete Field Testing Technician- Grade I Exam with complete solutionsSection 1: Temperature of Freshly Mixed Hydraulic-Cement Concrete - Answer- C1064
The end of the temperature sensing portion of the temperature measuring device is submerged a minimum of _____ into the freshly mixed concrete. - Answer- 3 inches
The temperature measuring device shall be capable of accurately measuring temperature of freshly mixed concrete to _____, throughout a range of _____. - Answer-
+/- 1 °F 30 °F to 120 °F
The temperature measuring device shall be verified _____, or whenever there is a question of _____. - Answer- Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - Answer- True
The temperature of concrete may be measured in a wall form. True of False - Answer- True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False? - Answer- False
What must be done to the sample container prior to sampling the concrete? - Answer- Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - Answer- Gently press the concrete around the temperature measuring device at the surface of the concrete
How long must the temperature measuring device remain in the freshly mixed concrete?
- Answer- At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - Answer- Reporting of temperature
The temperature of concrete is reported to the nearest _____. - Answer- 1 °F
According to ASTM C1064, what is one reason to take the temperature 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. True of False? - Answer- False
Section 2: Sampling Freshly Mixed Concrete - Answer- C172
The sample of concrete used for temperature determination must be rodded 25 times. True or False? - Answer- False
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - Answer- Compliance
This method covers sampling from four types of mixtures which are _____, _____, _____, _____, and _____. - Answer- Stationary mixers, Paving mixers, Revolving Drum mixers
Continuous mixers, and Open Top mixers
The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes. - Answer- 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True of False? - Answer- True
The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is _____ minutes. - Answer- 5
The molding of strength test specimens shall begin within _____ minutes after fabricating the 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- 1 ft³
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 - Answer- 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. - Answer- 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 this batch. - Answer- 2
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