EXAM
◉ After all portions of the composite sample have been obtained,
A. immediately begin conducting tests or molding specimens.
B. transport the samples to the place where tests are to be
performed and specimens are to be molded.
C. combine and remix the samples with a scoop or shovel for at least
3 minutes.
D. determine which tests are to be performed and the number of
specimens to be molded. Answer: B. transport the samples to the
place where tests are to be performed and specimens are to be
molded.
◉ It is ok to obtain portions of the sample from the very first or last
part of the batch discharge.
A. True
B. False. Answer: B. False
,◉ The process or removing aggregate larger than a designated size
from the fresh concrete by sieving it on a sieve of the designated size
is known as
A. Discharging
B. Sampling
C. Wet Sieving
D. Dry Sieving. Answer: C. Wet Sieving
◉ The slump test provides an indication of the water content of a
concrete mixture.
A. True
B. False. Answer: B. False
◉ A slump mold can be fabricated from materials other than metal.
A. True
B. False. Answer: A. True
◉ The length of the tamping rod shall be
,A. not less than 20 inches
B. no more than 4 inches greater than the depth of the mold.
C. at least 4 inches greater than the depth of the mold but not more
than 24 inches
D. not less than 12 inches.. Answer: C. at least 4 inches greater than
the depth of the mold but not more than 24 inches
◉ The slump test is applicable to concrete having a nominal
maximum size (NMS) coarse aggregate up to __________ inch(es) in
size.
A. 1-1/2
B. 2.0
C. 0.75
D. 1.0. Answer: A. 1-1/2
◉ If the condition of a non-metal mold is suspected of being out of
tolerance, the result of a single comparative test with a metal mold
shall not differ more than ____ inch, otherwise the non-metal mold
must be removed from service.
A. 0.50
B. 0.75
C. 0.25
, D. 1.0. Answer: A. 0.50
◉ The slump mold is filled with concrete in three layers
A. by height.
B. by mass (weight)
C. each consisting of 3 scoops of concrete
D. by volume. Answer: D. by volume
◉ After a layer of concrete is rodded, the exterior of the slump cone
is tapped 10 to 15 times with the mallet.
A. True
B. False. Answer: B. False
◉ If, while rodding the third layer of concrete, the top surface of the
concrete falls below the top rim of the mold,
A. stop, add concrete to maintain an excess, then start a new rod
count.
B. stop, add concrete to maintain an excess, then continue the rod
count from where you left off
C. stop the test and perform a new test on a new sample of material.