Aci Certification – Concrete Field Testing Technician Grade 1

ACI CERTIFICATION – CONCRETE
FIELD TESTING TECHNICIAN
GRADE 1


Sampling Fresh Concrete: Collecting a representative sample of concrete
to be tested is as important as executing the test methods to obtain
_______________________________. - ANSWER- Accurate results
(Reference 1.2)


Sampling Fresh Concrete: This practice covers sampling from four types
of equipment , which are ________________________________,
________________________,
________________________________________, and
_____________________ ____________. - ANSWER- Stationary
mixers, paving mixers, revolving truck mixers, continuous mixers
(Reference 1.5)


Sampling Fresh Concrete: The elapsed time between obtaining the first
and final portions of the composite sample shall not exceed
____________________. - ANSWER- 15 minutes (Reference 1.5)


Sampling Fresh Concrete: Portions of a composite sample shall be
thoroughly remixed before beginning tests on the sample? True or
False? - ANSWER- True (Reference 1.5.5)

,Sampling Fresh Concrete: Start tests for slump, temperature, and air
content within ________________ after obtaining the final portion of
the composite sample. - ANSWER- 5 minutes (Reference 1.5.5 &
Figure 1.6)


Sampling Fresh Concrete: Start molding specimens for strength tests
within ___________________ after fabricating the composite sample. -
ANSWER- 15 minutes (Reference 1.5.5 & Figure 1.6)


Sampling Fresh Concrete: The concrete sample must be protected from
contamination and ______________________. - ANSWER-
Evaporation (Reference 1.2)


Sampling Fresh Concrete: The minimum sample for making strength test
specimens is _____________________. - ANSWER- 1 FT^3 (28 L)
(Reference 1.5.1)


Sampling Fresh Concrete: Where 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- Two
(Reference 1.5.2)


Sampling Fresh Concrete: When sampling from a paving mixer, obtain
samples from a least ________ difference portions of the pile and
combine them into one composite sample for test purposes. -
ANSWER- Five (Reference 1.5.3)

, Sampling Fresh Concrete: When sampling from revolving truck mixer,
sample the concrete by collecting ________ or more portions taken at
regularly spaced intervals during discharge of the middle portion of the
batch. - ANSWER- Two (Reference 1.5.2)


Sampling Fresh Concrete: Concrete samples from a truck mixer must be
obtained before any water or admixtures are added to the mixer at the
job site. True or False? - ANSWER- False (Reference 1.5.2)


Sampling Fresh Concrete: When the concrete contains aggregate larger
than that permitted for a particular test method, the sample of concrete
must be ______________________ before making the test. - ANSWER-
Wet screened (Reference 1.5.1)


Temperature of Fresh Concrete: The stem of the thermometer is
submerged a minimum of _______________________. - ANSWER- 3
inches (75 mm) (Reference 2.4)


Temperature of Fresh Concrete: The thermometer shall be capable of
accurately measuring the temperature of freshly mixed concrete to
_____________________ throughout a range of
_________________________. - ANSWER- 1 degree F (+/- 0.5 degree
C), 30 to 120 degree F (0 to 50 degree C) (Reference 2.3.2)


Temperature of Fresh Concrete: The thermometer shall be verified
within
__________________________________________________________