Wnen incorrect concrete slump is
detected, what action should you
take to correct the problem?
Decrease or increase the
Change the proportions of the
fine coarse aggregate only
Either 1 or 2 above
Add water to the batch
A mixture of only water and cement
is commonly referred to as
The rated capacity of a concrete
mixing machine is determined by
The cubic feet of the mixed
The cubic feet of the dry
The cubic yards of the dry
The weight of the dry
In cement batch-plant operations,
the aggregate must pass through a
weigh box before being discharged
into the mixer.
You are to mix a 1:2:4 batch of
concrete by hand.
part of the sand onto a mixing
platform. in what order should you
add and mix the other ingredients?
Cement, water, aggregate, sand
Cement, sand, water, aggregate
Aggregate, sand, cement, water
Cement, sand, aggregate, water
In a 16-S concrete mixer, what
maximum size aggregate can you use?
3. 3 -in
In a 16-S concrete mixer, when
should water be added to the mix?
Just before the cement
Just before the sand
Just before the aggregate
After all the dry ingredients
have been added
You are to charge the skip of a 16-
S concrete mixer. In what order
should you add the dry ingredients?
Cement, aggregate, sand
Aggregate, cement, sand
Sand, cement, aggregate
Aggregate, sand, cement
When using a large mixing machine,
what minimum time should you mix 2
1/3 cubic yards of concrete?
1 min, 15 sec
1 min, 30 sec
2 min, 15 sec
2 min, 45 sec
It is now 12 noon and you just
finished pouring concrete. You
should make sure inside of the
mixing drum is cleaned no later
When cleaning a mixing drum, you
should place the coarse aggregate
in the drum and turn for how long?
1. 5 min
When concrete must be discharged
more than 4 feet above the level of
placement, why should it be dumped
into an elephant trunk?
To reduce segregation
To prevent spattering
To accurately place it
To ensure workable consistency