Which type of admixture is added to a concrete mixture to help it flow more freely?
Sand
Shale
Clinker
Superplasticizers - answer-Superplasticizers
Which of the following is a reinforcing component added to concrete before it hardens to resist tensile forces?
Sand
Wood spikes
She...
CONCRETE AND MASONRY CONSTRUCTION EXAM
Which type of admixture is added to a concrete mixture to help it flow more freely?
Sand
Shale
Clinker
Superplasticizers - answer-Superplasticizers
Which of the following is a reinforcing component added to concrete before it hardens to
resist tensile forces?
Sand
Wood spikes
Sheets of metal
Reinforcing bars (rebar) - answer-Reinforcing bars (rebar)
Which of the following statements regarding ordinary reinforcing of concrete is MOST
accurate?
Before pouring the concrete, it must be permitted to cure.
Steel bars in the concrete support the entire compressive load.
Mechanical vibrators are used to expedite curing of the concrete.
Steel bars are placed in the formwork, and wet concrete is placed in the formwork
around the bars. - answer-Steel bars are placed in the formwork, and wet concrete is
placed in the formwork around the bars.
Which of the following statements regarding pretensioning concrete is MOST accurate?
Steel strands are tensioned after the concrete has reached a certain strength.
Steel strands are stretched to produce a tensile force before the concrete is poured.
Pretensioning concrete is a way to alter the outer appearance for aesthetic purposes.
Pretensioned concrete members take on a slight upward deflection that remains after
loads are applied. - answer-Steel strands are stretched to produce a tensile force before
the concrete is poured.
Which of the following is placed in forms and cured at a plant away from the job site?
Precast concrete
Cast-in-place concrete
Flat-slab concrete frame
Slab and beam concrete frame - answer-Precast concrete
The ideal temperature for concrete in the process of curing is between:
30° and 50°F (-1° and 10°C).
50° and 70°F (10° and 21°C).
70° and 90°F (21° and 32°C).
90° and 110°F (32° and 43°C). - answer-50° and 70°F (10° and 21°C).
, Which of the following tests is used to check the moisture content of a batch of
concrete?
Slump test
Hydration test
Aggregate test
Compression test - answer-Slump test
The primary cause of spalling in concrete is:
expansion of moisture.
inadequate reinforcement.
pyrolysis of the portland cement.
evaporation of the microscopic gel. - answer-expansion of moisture.
Which of the following is BEST described as a process that structurally weakens
concrete and exposes reinforcing steel to fire?
Spalling
Slumping
Prestressing
Heat sinking - answer-Spalling
Because concrete has relatively good insulating properties, it tends to retain the heat of
an exposing fire and release it slowly, in an effect referred to as the:
slump effect.
heat sink effect.
hydration effect.
heat release effect. - answer-heat sink effect.
In slab and beam concrete frames, the beams must be closely spaced because the
slab:
is precast.
uses lower grade concrete.
is thin and requires more support.
is heavy and requires more support. - answer-is thin and requires more support.
Waffle construction is used where spans are:
high and floor loadings are low.
short and floor loadings are low.
high and floor loadings are high.
short and floor loadings are high. - answer-short and floor loadings are high.
Which of the following statements regarding tilt-up construction is MOST accurate?
Tilt-up walls can only be one story high.
Tilt-up walls only support steel beam roofing.
Reinforced wall panels are cast off site and transported to the site.
Reinforced wall panels are cast on site in horizontal casting beds. - answer-Reinforced
wall panels are cast on site in horizontal casting beds.
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