CSLB Concrete C8 License Practice Test #1
Questions And Well Elaborated Solutions
The anchor bolt must be embedded ___ into the slab. - ANSWER 7"
What is the purpose of the deformed rebar? - ANSWER Deformations improve the
bond between steel and concrete
What would be the easiest way to avoid puddling under a slab? - ANSWER
Careful grading
Air-entraining: - ANSWER Improves the working life of concrete.
What is the maximum number of parallel bars that can be bundled together and
still be considered a single unit? - ANSWER 4 bars
Explanation:
According to the American Concrete Institute, groups of parallel reinforcing bars
bundles in contact to act as a unit shall be limited to four in any one bundle.
Shotcrete can be wet or dry. What are the advantages of wet? - ANSWER Exact
batching
What is the maximum spacing of the rebar in the stem wall? - ANSWER 18"
Explanation:
The code requires additional rebar to be used if the spacing between rebar in the
stem wall exceeds 18".
What is the area of the circle if the diameter is 20 feet? - ANSWER 314 sq. ft.
Explanation:
, There are two ways to solve for the area of the circle.Traditional MethodUse the
following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 10
(half of the diameter)Area = 3.14 x 10 x 10Area = 314 sq. ft.
Shortcut MethodArea of the circle is 78.5% of the square. Treat the circle as a
square and solve for the area.Step 1. Find the area of the square instead of the
circle.20' x 20' = 400 sq. ft.Step 2. Since a circle is 78.5% of the square, multiply
the area of the square by 78.5% (or .785 if there is no percentage sign on the
calculator).400 sq. ft. x .785 = 314 sq ft
A standard truck load of concrete is around 10 cubic yards of material. In a pour
with an average depth of 8 inches, and a width and length of 12 by 32 feet, how
much will the second truck need to bring? - ANSWER One load was enough
Explanation:
Step 1. Solve for the volume of the pour: 12 x 32 x 8/12 (or 0.667) = 256.128 cubic
feetStep 2. Convert cubic feet into cubic yards.256.128 ÷ 27 = 9.49 cubic
yardsSince one truck carries 10 cubic yards of concrete, one truck will be enough
for the pour.
To ensure proper grounding, the grounding electrode must be encased by how
many inches of concrete? - ANSWER 2"
Explanation:
To ensure proper grounding, the electrode must meet the following criteria:1. Must
be encased by 2 or more inches of concrete2. Electrode must be at or near the
bottom of the footing or foundation3. Concrete must be in contact with the
ground4. At least 20 feet of rebar that is at least ½" thick or 20 feet of solid copper
as a conductor
Required reinforcement bar splicing length or lap length is a function of: -
ANSWER ALL
-Diameter of the reinforced bar.
-Stress in the reinforced bar at the cross section of splicing.
Questions And Well Elaborated Solutions
The anchor bolt must be embedded ___ into the slab. - ANSWER 7"
What is the purpose of the deformed rebar? - ANSWER Deformations improve the
bond between steel and concrete
What would be the easiest way to avoid puddling under a slab? - ANSWER
Careful grading
Air-entraining: - ANSWER Improves the working life of concrete.
What is the maximum number of parallel bars that can be bundled together and
still be considered a single unit? - ANSWER 4 bars
Explanation:
According to the American Concrete Institute, groups of parallel reinforcing bars
bundles in contact to act as a unit shall be limited to four in any one bundle.
Shotcrete can be wet or dry. What are the advantages of wet? - ANSWER Exact
batching
What is the maximum spacing of the rebar in the stem wall? - ANSWER 18"
Explanation:
The code requires additional rebar to be used if the spacing between rebar in the
stem wall exceeds 18".
What is the area of the circle if the diameter is 20 feet? - ANSWER 314 sq. ft.
Explanation:
, There are two ways to solve for the area of the circle.Traditional MethodUse the
following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 10
(half of the diameter)Area = 3.14 x 10 x 10Area = 314 sq. ft.
Shortcut MethodArea of the circle is 78.5% of the square. Treat the circle as a
square and solve for the area.Step 1. Find the area of the square instead of the
circle.20' x 20' = 400 sq. ft.Step 2. Since a circle is 78.5% of the square, multiply
the area of the square by 78.5% (or .785 if there is no percentage sign on the
calculator).400 sq. ft. x .785 = 314 sq ft
A standard truck load of concrete is around 10 cubic yards of material. In a pour
with an average depth of 8 inches, and a width and length of 12 by 32 feet, how
much will the second truck need to bring? - ANSWER One load was enough
Explanation:
Step 1. Solve for the volume of the pour: 12 x 32 x 8/12 (or 0.667) = 256.128 cubic
feetStep 2. Convert cubic feet into cubic yards.256.128 ÷ 27 = 9.49 cubic
yardsSince one truck carries 10 cubic yards of concrete, one truck will be enough
for the pour.
To ensure proper grounding, the grounding electrode must be encased by how
many inches of concrete? - ANSWER 2"
Explanation:
To ensure proper grounding, the electrode must meet the following criteria:1. Must
be encased by 2 or more inches of concrete2. Electrode must be at or near the
bottom of the footing or foundation3. Concrete must be in contact with the
ground4. At least 20 feet of rebar that is at least ½" thick or 20 feet of solid copper
as a conductor
Required reinforcement bar splicing length or lap length is a function of: -
ANSWER ALL
-Diameter of the reinforced bar.
-Stress in the reinforced bar at the cross section of splicing.
