ACI EXAM
This test method covers sampling from stationary, paving and truck mixers, and from agitating and non
agitating equipment used to transport central mixed concrete - Answer-True
When the concrete contains large aggregate, the testing technician should wet sieve the sample before
making unit weight tests for use in yield computation - Answer-False - cant wet sieve unit weight
Samples should be taken before 10% or after 90% of the batch has been discharged. - Answer-False
Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump tests -
Answer-True
Tests for slump and air content must be started within ___ after obtaining the final portion of the
composite sample - Answer-5 minutes
Start molding strength test specimens within ___ after fabricating the composite sample - Answer-15
minutes
How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitator -
Answer-By the rate of revolution of the drum
, The mold of the shaper of a ___ - Answer-Frustum of a cone
The top diameter is ___ and the diameter at the base is __ - Answer-4",8"
While the technician is checking the slump of the concrete, there is a decided falling away or shearing
off of the concrete from one side of the sample. What should the technician do? - Answer-Disregard the
test and retest on another portion of the sample
The mold is filled in three equal layers by volume, which makes the first third at __ and the second third
at ___ - Answer-2 5/8, 6 1/8
The maximum size of aggregate allowed for slump test is - Answer-1 1/2"
When ridding the second and third layers the rod should penetrate through the layer and into the
previous layer ___ - Answer-1"
The slump of the concrete was determined to be 4 5/16 what should be recorded as the slump -
Answer-4 1/4 - closest quarter
What's is the maximum amount of time to complete the slump test - Answer-2.5 minutes
The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold - Answer-
False
When ridding the final lift additional concrete must be added to keep excess concrete above the top of
the mold at all times - Answer-True
This test method covers sampling from stationary, paving and truck mixers, and from agitating and non
agitating equipment used to transport central mixed concrete - Answer-True
When the concrete contains large aggregate, the testing technician should wet sieve the sample before
making unit weight tests for use in yield computation - Answer-False - cant wet sieve unit weight
Samples should be taken before 10% or after 90% of the batch has been discharged. - Answer-False
Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump tests -
Answer-True
Tests for slump and air content must be started within ___ after obtaining the final portion of the
composite sample - Answer-5 minutes
Start molding strength test specimens within ___ after fabricating the composite sample - Answer-15
minutes
How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitator -
Answer-By the rate of revolution of the drum
, The mold of the shaper of a ___ - Answer-Frustum of a cone
The top diameter is ___ and the diameter at the base is __ - Answer-4",8"
While the technician is checking the slump of the concrete, there is a decided falling away or shearing
off of the concrete from one side of the sample. What should the technician do? - Answer-Disregard the
test and retest on another portion of the sample
The mold is filled in three equal layers by volume, which makes the first third at __ and the second third
at ___ - Answer-2 5/8, 6 1/8
The maximum size of aggregate allowed for slump test is - Answer-1 1/2"
When ridding the second and third layers the rod should penetrate through the layer and into the
previous layer ___ - Answer-1"
The slump of the concrete was determined to be 4 5/16 what should be recorded as the slump -
Answer-4 1/4 - closest quarter
What's is the maximum amount of time to complete the slump test - Answer-2.5 minutes
The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold - Answer-
False
When ridding the final lift additional concrete must be added to keep excess concrete above the top of
the mold at all times - Answer-True
