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ACI EXAM|59 ANSWERED QUESTIONS|DISTINCTION GRADED
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ACI EXAM|59 ANSWERED QUESTIONS|DISTINCTION GRADED
This test method covers sampling from stationary, paving and truck mixers,
and from agitating and non agitating equipment used to transport central
mixed concrete - -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 - -False - cant wet sieve unit weight
-Samples should be taken before 10% or after 90% of the batch has been
discharged. - -False
-Samples smaller than 28L (1 cu.ft.) are allowed on routine air content,
temperature, and slump tests - -True
-Tests for slump and air content must be started within ___ after obtaining
the final portion of the composite sample - -5 minutes
-Start molding strength test specimens within ___ after fabricating the
composite sample - -15 minutes
-How do you regulate the rate of discharge of the batch from the revolving
truck drum mixer or agitator - -By the rate of revolution of the drum
-The mold of the shaper of a ___ - -Frustum of a cone
-The top diameter is ___ and the diameter at the base is __ - -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? - -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 ___ - -2 5/8, 6 1/8
-The maximum size of aggregate allowed for slump test is - -1 1/2"
-When ridding the second and third layers the rod should penetrate through
the layer and into the previous layer ___ - -1"
, -The slump of the concrete was determined to be 4 5/16 what should be
recorded as the slump - -4 1/4 - closest quarter
-What's is the maximum amount of time to complete the slump test - -2.5
minutes
-The sides of the slump mold should be lightly tapped to consolidate the
concrete in the mold - -False
-When ridding the final lift additional concrete must be added to keep
excess concrete above the top of the mold at all times - -True
-ASTM C 1064 defines the maximum recommended temperature for
concrete - -False - test standard not a specification standard
-What temperature test method must be complete within ___ after obtaining
the sample - -5 minutes
-Each temperature measuring device should be calibrated ___ or whenever
there is a question of ___ - -Annually, accuracy
-When determining the temperature of fresh concrete what is the minimum
amount of concrete cover in all directions around the sensor of the TMD - -3
inches
-When the concrete contains a minimal maximum size of aggregate greater
than 3 inches it may require ___ before the temperature is stabilized after
mixing - -20 minutes
-After strike off of the measure used to determine density, a small quantity
of concrete may be added to correct a deficiency - -True
-If using any strike off plate the plate must be at least 1 in greater than the
diameter of the measure with which it is being used - -False - 2 inches
-If rodding is the method of consolidation being used, the measure must be
filled in how many layers? - -3 layers
-What is the required shape at the end of the tamping rod - -Rounded to a
hemispheric tip
-After consolidation of the final layer the concrete is 1/2" above the top of
the measure what should be done? - -Remove excess concrete with a scoop
or trowel
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