CET 2343 ACI exam review10
The maximum allowable sampling time between obtaining the first and final portions of a
composite sample is _____ minutes - ANSWERS-15 minutes
Concrete samples must be obtained before any water or admixtures are added to the mixer at
the job site. - ANSWERS-False
When sampling from a paving mixer, obtain samples from at least ____ different portions of the
pile and combine them to not one composite sample for test purposes. - ANSWERS-5
When sampling from a revolving drum truck, how many portions should be collected? -
ANSWERS-2 portions
Samples for strength should be taken before 10% or after 90% of the batch has been discharged
in a revolving drum truck. - ANSWERS-False
While a minimum of 1 cubic feet is required for strength testing, samples smaller than 1 cubic
foot are allowed on routine air content, temperature, and slump tests. - ANSWERS-True
Concrete samples must be protected from ___ and ____. - ANSWERS-Sun and wind
Portions for a composite sample shall be combined and thoroughly remixed before beginning
tests on the sample. - ANSWERS-True
After obtaining the final portion of the composite sample, the maximum allowable time before
beginning tests got slump, temperature, and air content is __ minutes - ANSWERS-5
, Start molding strength samples within __ mins after fabricating the composite sample. -
ANSWERS-15
When the concrete contains aggregate larger than permitted for a particular test method, the
sample of concrete can be ________ before testing - ANSWERS-Wet sieved
Name the 5 types of equipment this standard covers for sampling. - ANSWERS-Revolving drum
truck mixer, stationary mixers, paving mixers, continuous mixers, open ended/topped truck
mixers
Concrete should cover ____ inches around the temperature sensor. - ANSWERS-3 inches
When inserting the sensor into the sample, gently press concrete around the sensor. -
ANSWERS-True
The temperature reading must be complete between ___ and _____ minutes - ANSWERS-2 and
5
Read the temperature sensor to the nearest ___ F. - ANSWERS-1 degree
The temperature sensor should be removed when reading it. - ANSWERS-False
The temperature of fresh concrete can be measured in a wheelbarrow. - ANSWERS-True
The temperature of fresh concrete can be measured in a wall form. - ANSWERS-True
A composite sample is not required to measure the temperature of fresh concrete. - ANSWERS-
True
The maximum allowable sampling time between obtaining the first and final portions of a
composite sample is _____ minutes - ANSWERS-15 minutes
Concrete samples must be obtained before any water or admixtures are added to the mixer at
the job site. - ANSWERS-False
When sampling from a paving mixer, obtain samples from at least ____ different portions of the
pile and combine them to not one composite sample for test purposes. - ANSWERS-5
When sampling from a revolving drum truck, how many portions should be collected? -
ANSWERS-2 portions
Samples for strength should be taken before 10% or after 90% of the batch has been discharged
in a revolving drum truck. - ANSWERS-False
While a minimum of 1 cubic feet is required for strength testing, samples smaller than 1 cubic
foot are allowed on routine air content, temperature, and slump tests. - ANSWERS-True
Concrete samples must be protected from ___ and ____. - ANSWERS-Sun and wind
Portions for a composite sample shall be combined and thoroughly remixed before beginning
tests on the sample. - ANSWERS-True
After obtaining the final portion of the composite sample, the maximum allowable time before
beginning tests got slump, temperature, and air content is __ minutes - ANSWERS-5
, Start molding strength samples within __ mins after fabricating the composite sample. -
ANSWERS-15
When the concrete contains aggregate larger than permitted for a particular test method, the
sample of concrete can be ________ before testing - ANSWERS-Wet sieved
Name the 5 types of equipment this standard covers for sampling. - ANSWERS-Revolving drum
truck mixer, stationary mixers, paving mixers, continuous mixers, open ended/topped truck
mixers
Concrete should cover ____ inches around the temperature sensor. - ANSWERS-3 inches
When inserting the sensor into the sample, gently press concrete around the sensor. -
ANSWERS-True
The temperature reading must be complete between ___ and _____ minutes - ANSWERS-2 and
5
Read the temperature sensor to the nearest ___ F. - ANSWERS-1 degree
The temperature sensor should be removed when reading it. - ANSWERS-False
The temperature of fresh concrete can be measured in a wheelbarrow. - ANSWERS-True
The temperature of fresh concrete can be measured in a wall form. - ANSWERS-True
A composite sample is not required to measure the temperature of fresh concrete. - ANSWERS-
True
