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Concrete Test |Questions and 100% Correct Answers| Latest Update
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Concrete Test |Questions and 100%Correct Answers| Latest Update
A mix with a higher percentage of rock has the advantage of? - ANSWER Being less expensive
Air-entraining - ANSWER Improves the working life of concrete
Max strength of concrete is reached after? - ANSWER 28 days
Finishing with a steel float? - ANSWER Reduces risk of cracking
Hi-early - ANSWER Cures after 7 days
Releasing agent is used on forms, why is overuse a problem? - ANSWER Oil in the water
makes concrete less strong
What is the average dead load of dry concrete including reinforcement? - ANSWER 150 lbs/sq ft
PITCH in a spiral reinforcing is a measure of what? - ANSWER Spacing between turns
Strength tests are normally - ANSWER The average of 2 tests at a specified time, taken from
the same pour
, Bundled reinforcing bars are normally required to have a minimum cover of at least
the diameter of the bundle, except in the case of permanent proximity to earth where
the minimum will be? - ANSWER 3 inches
Weather conditions may make placing concrete inadvisable including - ANSWER High winds
and high temperatures
Construction loads are - ANSWER The MAXIMUM loads to which a structure will ever
be subjected
Green concrete is - ANSWER Concrete that's been treated for water exposure
Compacting placed concrete is advisable because of - ANSWER Higher cured strength
How long can a batch of concrete be in the truck before considerations of quality arise? -
ANSWER 45 minutes
What would be the easiest way to avoid pudding under a slab? - ANSWER Careful grading
In some cases it may be necessary to use stronger or double ties. Why? - ANSWER As a safety
precaution when workers may need to climb on reinforcement
On concrete paving or roadway, it's normal to use traverse joints at regular intervals. These
joints are best filled and sealed. Why? - ANSWER To reduce risk of exposure to the
reinforcing
When would a slab be double reinforced? - ANSWER To strengthen a slab that would otherwise
be thicker, to meet expected loads
When applying concrete to concrete there are several factors to consider. Which is most
important? - ANSWER In most cases the most important is the bond
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