CSLB CONCRETE C8 LICENSE 1 AND 2 EXAM
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST 2024 –
2025 ALREADY GRADED A+
What is the minimum mixing time for a mixture of 1 cubic yard? - ANSWERS-1
minute
Explanation:
Specifications usually require a minimum of 1 minute mixing for mixtures of 1 cu
yd capacity. It increases 15 seconds for each additional ½ cu yd of additional
mixture.
What class of formwork is used for temporary or light loads? - ANSWERS-Class I
,Explanation:
Class I - used for temporary or for light loadsClass II - used for structures that will
encounter heavy loads
Construction joints are: - ANSWERS-Joints designed to separate one pour from
another.
How many cubic yard of concrete is required for the footing shown, if it is 75 feet
long? - ANSWERS-2 ½ cubic yards
Explanation:
Step 1: Figure out the area of the face of the footing.Top area = 6" x 9" = 54
square inchesBottom area = 6" x 12" = 72 square inchesTotal area = 54 + 72 = 126
square inchesStep 2: Convert square inches into square feet.126 ÷ 144 = 0.875
square feetStep 3: Get volume by multiplying the previous answer by the
length.0.875 x 75 = 65.625 cubic feetStep 4: Convert cubic feet into cubic
yards.65.625 ÷ 27 = 2.43 cubic yardsSince there is no exact answer, round up the
number.
Where are spiral rebar ties used? - ANSWERS-In round columns
Control joints in sidewalks should be spaced at what intervals? - ANSWERS-Equal
to the width of the slab
Explanation:
, Generally the control joints in sidewalks should be spaced equal to the width of
the slab, but not more than 6 feet apart.
One cubic foot of cement weighs approximately: - ANSWERS-95 lbs
How many cubic yard of concrete is required for a 4" slab with the diameter of 15
feet? - ANSWERS-2 ½ cubic yards
Explanation:
Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π
= 3.14 and radius (r) = 7.5 feet (half of the diameter length)Area = 3.14 x 7.5 x
7.5Area = 176.625 sq. ft.Multiply area by the depth of the slab (in feet) to find the
volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic feet into
cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince 2.18 is not a given option, round up
the number to 2.5 cubic yardsShortcut MethodThis problem can be solved using a
much simpler method. First is to find the area of the square, then convert it into
the area of the circle by multiplying it by 78.5%.Area of the square = 15' x 15' =
225 square feetArea of the circle = 225 x .785 = 176.625 square feetDivide the
volume by 81 to solve for the cubic yards for a 4" slab.176.625 ÷ 81 = 2.18 cubic
yardsSince 2.18 is not a given option, round up the number to 2.5 cubic yards
The normal tolerance for the location of bends and ends of reinforcing bar is: -
ANSWERS-+/- 2 inches
How many cubic yards of backfill are required for a 3' x 5' trench, 1500 ft long,
with a 1 foot diameter pipe? - ANSWERS-789.72
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