CSLB Concrete C8 License Practice Test
#1 Questions And Well Elaborated
Solutions
What is the minimum depth of a footing below the soil? - answer 12"
What is the maximum spacing of the anchor bolts for 1-story house? - answer 6' o. c.
It is important to keep the work site tidy and clear of debris, especially used lumber and used
forms. Why? - answer To reduce risk of accidents.
What is the minimum width of the footing for a 1-story house? - answer 12"
What is the maximum spacing of the anchor bolts for a 2-story house? - answer 4' o. c.
High-early: - answer Is cured after 7 days.
Proper curing is essential. What factors are most important to consider? - answer There are
many factors, each with appropriate responses
What is the maximum spacing of control joints in driveways? - answer 20'
Explanation:
The control joints in driveways should be spaced equal to the width of the slab, but the maximum
permissible spacing is 20 feet.
If the concrete costs $90 per cubic yard, how much would you pay for 2 ½ cubic yards of
concrete with a 8.75% CA sales tax? - answer $244.69
Explanation:
Calculate the price of the concrete for 2 ½ cubic yards.$90 x 2.5 = $225.00Calculate the sales
tax.$225 x 8.75% (or 0.0875) = $19.69Calculate the total price including the sales tax.$225 +
$19.69 = $244.69
, 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
Explanation:
Step 1. Find the net face area of the trench deducting for pipe.Face area including pipe: 3 x 5 =
15 square feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A = 0.785Find the face area of the trench
minus area of the pipe, which will give you the net area for the backfill.15 - 0.785 = 14.215Step 2.
Find the total volume of the backfill.14.215 x 1500 = 21322.5 cubic feetConvert the volume into
cubic yards.21322.5 ÷ 27 = 789.72 cubic yards
When can the live load be calculated by multiplying the height, width and length of a pour and
dividing by the deadload? - answer Never
Tensile strength in concrete is achieved by: - answer The use of steel reinforcement.
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.
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.
#1 Questions And Well Elaborated
Solutions
What is the minimum depth of a footing below the soil? - answer 12"
What is the maximum spacing of the anchor bolts for 1-story house? - answer 6' o. c.
It is important to keep the work site tidy and clear of debris, especially used lumber and used
forms. Why? - answer To reduce risk of accidents.
What is the minimum width of the footing for a 1-story house? - answer 12"
What is the maximum spacing of the anchor bolts for a 2-story house? - answer 4' o. c.
High-early: - answer Is cured after 7 days.
Proper curing is essential. What factors are most important to consider? - answer There are
many factors, each with appropriate responses
What is the maximum spacing of control joints in driveways? - answer 20'
Explanation:
The control joints in driveways should be spaced equal to the width of the slab, but the maximum
permissible spacing is 20 feet.
If the concrete costs $90 per cubic yard, how much would you pay for 2 ½ cubic yards of
concrete with a 8.75% CA sales tax? - answer $244.69
Explanation:
Calculate the price of the concrete for 2 ½ cubic yards.$90 x 2.5 = $225.00Calculate the sales
tax.$225 x 8.75% (or 0.0875) = $19.69Calculate the total price including the sales tax.$225 +
$19.69 = $244.69
, 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
Explanation:
Step 1. Find the net face area of the trench deducting for pipe.Face area including pipe: 3 x 5 =
15 square feetArea of the pipe: 𝐴=𝜋𝑟2A = 3.14 x .5 x .5A = 0.785Find the face area of the trench
minus area of the pipe, which will give you the net area for the backfill.15 - 0.785 = 14.215Step 2.
Find the total volume of the backfill.14.215 x 1500 = 21322.5 cubic feetConvert the volume into
cubic yards.21322.5 ÷ 27 = 789.72 cubic yards
When can the live load be calculated by multiplying the height, width and length of a pour and
dividing by the deadload? - answer Never
Tensile strength in concrete is achieved by: - answer The use of steel reinforcement.
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.
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.
