ASSIGNMENT 12
Textbook Assignment: “Material Testing.” Pages 13-29 through 13-51.
Learning Objective: Identify
tests required for concrete
construction quality control.
Identify procedures used for
preparing and performing these
tests.
12-1.
What is the purpose of the slump
test?
1.
To measure the water content
2.
To check the cement content
3.
To check the workability of
the mix
4.
To check aggregate
cohesiveness
12-2.
Which of the following effects are
associated with excessive bleeding
of the concrete mix?
1.
Increased water-cement ratio
in the mix
2.
Increased water-cement ratio
near the surface
3.
A weaker lower layer but
increased surface durability
4.
Lack of water migration and
slower hydration
12-3.
What is the desired quantity of
air for an air-entrained mix?
1. 4.0 to 7.5 percent of
the cement
2. 4.0 to 7.5 percent of
the water
3. 4.0 to 7.5 percent of
the total aggregate
4. 4.0 to 7.5 percent of
the total mix
12-4.
When you are determining the unit
weight, what is the purpose of
tapping the side of the sample
container after rodding?
1.
To allow the sample to settle
similar to actual placement
2.
To remove air pockets
3.
To cause segregation of the
aggregate
4.
To determine the air content
by the weight differential
12-5.
What is the minimum number of
cylinders required for a
compressive strength test?
1.
One
2.
Two
3.
Three
4.
Four
12-6.
The diameter of the test specimen
for compressive strength is
determined to the nearest
1.
0.001 inch
2.
0.05 inch
3.
0.01 inch
4.
0.1
inch
12-7.
The test load is applied to the
cylinder at what constant rate?
1.
10 to 20 psi
2.
20 to 40 psi
3.
30 to 50 psi
4.
20 to 50 psi
12-8.
When the flexural-strength test
is performed, the load is applied
to what portion of the beam?
1.
Sides
2.
Ends
3.
Top
4.
Bottom
82
