CSLB CONCRETE C8 LICENSE EXAM LATEST 2024 WITH 300 ACTUAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWE

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.A jack system was used for concreting of a slab spanning 15 feet x 20 feet. As per
the guidelines, the formwork shall be removed only after __________ days. -
ANSWER-14 days.

Explanation:
Formwork of the slab with more than 14 feet span should be retained up to 14
days.

The concrete repair works shall not be carried out if the temperature is
below________ ͨ F - ANSWER- 40

Explanation:
Low temperature causes freezing and thawing.

The concrete used for cementitious lining for the pipes, shall have the compressive
strength of ________ psi after 28 days. - ANSWER-6000

As per Caltrans specifications, the full depth concrete repair joint must be at least
__________ feet from the nearest crack or joint. - ANSWER-6'6"

pg. 1

,Refer to the house plan. What is the total cost for the foundation slab if the
contractor charges $3.54 per square foot? - ANSWER-$6524.90

Explanation:
The easiest way to solve for the area of the slab is to image a full rectangle of the
slab and subtract void areas from the area of the slab.

Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2
sq ftCenter void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' =
137.505Net area of the foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 =
1843.19 sq ft.Calculate the price of the slab.1843.19 sq ft x $3.54 = $6524.90

What is the minimum spacing of parallel reinforcing bars placed in two or more
layers? - ANSWER-1 inch

Explanation:
According to the American Concrete Institute, where parallel reinforcement is
placed in two or more layers, bars in the upper layers shall be placed directly above
bars in the bottom layer with clear distance between layers not less than 1 inch.

What is the volume of a cylinder if the diameter equals 3 feet and the length equals
to 12 feet? - ANSWER-84.78 cubic feet

Explanation:
There are two ways to solve the problem. However, regardless of which method is
used, you need to first determine the area of the circle then multiply it by the
length.Traditional MethodUse the following formula:Area of the circle = π x r x
rWhere π = 3.14 and radius (r) = 1.5 feet (half of the diameter length)Area = 3.14 x
1.5 x 1.5Area = 7.065 sq. ft.Multiply area by the length to find the volume.7.065 x
12 = 84.78Shortcut MethodArea of the circle is 78.5% of the square. Treat the

pg. 2

,circle as a square and solve for the area.Find the area of the square instead of the
circle.3' x 3' = 9 sq. ft.Since circle is 78.5% of the square, multiply area of the
square by 78.5% (or .785 if there is no percentage sign on the calculator).9 sq. ft. x
.785 = 7.065 square feetMultiply area by the length to find the volume.7.065 x 12
= 84.78 cubic feet

Where are spiral rebar ties used? - ANSWER-In round columns

Control joints in sidewalks should be spaced at what intervals? - ANSWER-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: - ANSWER-95 lbs

How many cubic yard of concrete is required for a 4" slab with the diameter of 15
feet? - ANSWER-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

pg. 3

, 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: -
ANSWER- +/- 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? - ANSWER-789.72