EXAM
◉ The temperature measureing device shall have a capacity of
measuring temperature of freshly mixed conrcrete to +-_____ degrees
F throught a range of _____ Answer: 1(.5 degrees C), 30-120 (0-50
degrees C)
◉ The temperature measuring device shall be calibrated____, or
whenever there is a question of _____ Answer: annually, accuracy
◉ The temp of concrete may be measured in a wheelbarrow Answer:
true
◉ the temp of concrete may be measured in a wall form Answer:
true
◉ A composite sample of concrete is required even if the only
purpose for obtaining the sample is to determine temp. 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 temp
measuring device after the device has submerged Answer: Press
concrete around measuring device
◉ How long must the temp device remain in the concrete Answer: at
least 2 minutes (but no more than 5)
◉ After temp of concrete is read, what then is required Answer:
reporting of temp
◉ the temp of concrete to be measured to the nearest ____degree F
Answer: 1 (.5 degree C)
◉ According to the ASTM C1064 what is one reason to take the temp
of concrete Answer: verify conformance to a specified requirement
for temp
◉ A max temp of concrete is specified in ASTM C1064 Answer: False
◉ The sample of concrete used for temp determination must be
rodded 25 times Answer: False
◉ Sampling by this method is required when tests are to be made to
determine ____ with specification requirements Answer: compliance
, ◉ The method covers sampling from four types of mixers which are
_____, _____, ____, and _______ Answer: stationary mixes, paving mixers,
revolving drum 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
before beginning tests on the sample Answer: True
◉ The maximum elapsed time allowed between obtaining the final
portion of the composite sample and beginning the tests for slump,
temp, 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 test specimen is Answer: 28 L (1ft^3)