Deck 40: Essentials of Concrete Work

Question 1

The formation of many fine hairline cracks on the surface of new concrete is called ______ .

A) Crazing
B) Scaling
C) Splitting
D) Crackling

Answer 1

A

Question 2

______ tests are performed to determine if the concrete has the correct compressive strength after the concrete has cured for a determined length of time.

A) Cylinder
B) Slump
C) Compression
D) Elasticity

Answer 2

A

Question 3

The first step in placing concrete is preparing the area to receive it by removing all sod, large rocks or stones, or trash.

Answer 3

True

Question 4

Work known as _____ includes floors, slabs, and walks.

A) flat work
B) footings
C) form work
D) specialty concrete

Question 5

Even the average cement mason or bricklayer can lay decorative cement that imitates brick, tile, or natural stone.

Question 6

Many commercial job specifications require that fresh concrete be tested on the job.

Question 7

The screeding operation is done immediately after placing the concrete in the form to obtain good results.

Question 8

Concrete should be dried fast to attain its maximum strength.

Question 9

It is highly recommended to purchase only brand names when buying tools for professional use.

Question 10

_____ is an ingredient in concrete that causes the concrete to become hard.

A) Fine aggregates
B) Portland cement
C) Admixtures
D) Course aggregates

Question 11

A ______ attaches to a screed board and works faster than a regular screed board and allows a dryer concrete to be placed and finished.

A) Magnesium straight Darby
B) Bon Electric Speedy Screed
C) Handicap Ramp Bull Float
D) WHA-Lite "Euro" Decker Float

Question 12

Aggregates make up about _____ of the volume of concrete.

A) 10 to 15 percent
B) 20 to 40 percent
C) 35 to 50 percent
D) 60 to 80 percent

Question 13

Specialty tools have been developed in recent years that can be used to achieve special effects in concrete.

Question 14

The _____ method of ordering concrete involves stating the time of delivery and the psi strength desired.

A) layman
B) rule-of-thumb
C) prescription
D) estimation

Question 15

The concrete truck should be placed away from the forms and the cement moved to the forms in wheelbarrows whenever possible.

Question 16

Admixtures reduce the strength of concrete mix.

Question 17

As a rule, gravel is used in an exposed aggregate finish.

Question 18

Concrete can be appropriately cured by which of the following methods?

A) Using fans to dry the concrete
B) Freezing the concrete
C) Covering the concrete with dry portland cement
D) Spraying water onto the concrete

Question 19

A ______ is used to round off the edge of concrete to prevent flaking or chipping.

A) power trowel
B) traditional wood float
C) hand size sidewalk edger
D) concrete rake

Question 20

______ is leveling the concrete evenly to the top of the forms.

A) Floating
B) Edging
C) Screeding
D) Grooving