G9

Question 1

What is the purpose of the backer rod?

Answer 1

Support caulking and maintain a thin bead of elasticity

Question 2

What types of materials are used for backer rods?

Answer 2

Closed cell foam, rubber, neoprene

Question 3

What tools are required for the installation of caulking?

Answer 3

Fun, applicator

Question 4

7 steps used to install caulking.

Answer 4

Clean, mask, prime, backer rod, caulk, took joint, remove tape

Question 5

What shape is the tooled surface of a caulking joint?

Answer 5

Hourglass

Question 6

What type of caulking should have the area to be caulked cleaned with vinegar prior to application?

Answer 6

Silicone

Question 7

Two types of rubber-based caulking.

Answer 7

Polysulfide and Butyl

Question 8

Which caulking can be cleaned up with water before it cures?

Answer 8

Acrylic

Question 9

Which caulking should not be used with polystyrene?

Answer 9

Polyurethane

Question 10

List two types of caulking that can be painted.

Answer 10

Acrylic and Butyl

Question 11

How are slip forms held together?

Answer 11

Yoke

Question 12

What types of buildings are built with the slip-form method?

Answer 12

• Tall uniform structures
• Elevator shafts
• Water towers

Question 13

At what rate are vertical slip-forms moved?

Answer 13

8”-18” per hour

Question 14

Where is the finishers scaffold on a slip-form construction?

Answer 14

Below and Outside.

Question 15

What depth of the layers is used when placing concrete?

Answer 15

12”

Question 16

How are curved walkers built?

Answer 16

3 pieces of lumbe laminated together with offset joints.

Question 17

What is the what is the purpose of a finishers scaffold?

Answer 17

Repair and touch up.

Question 18

In mass concrete applications, how are the panel aligning bolts used?

Answer 18

Line up panel frames at the lower end of the frame.

Question 19

What is the concern when designing the concrete for a gravity Dam?

Answer 19

Heat of hydration and cost.

Question 20

Why is the concrete a different strength at the exposed faces of a gravity dam?

Answer 20

For durability.

Question 21

What is used to help cool a gravity dam?

Answer 21

Cooling pipes.

Question 22

Why is the concrete placed in blocks in a gravity dam?

Answer 22

To minimize shrinkage cracks.

Question 23

What does a massive footing have in common with a gravity dam?

Answer 23

Large size

Question 24

What is done to reduce the cost of a concrete mixture?

Answer 24

Less cement per cu. M. large, well graded aggregate, fly ash.

Question 25

Explain the process of pre-stressing concrete beams.

Answer 25

Cables are placed and either pre or post-tensioned.

Question 26

How does prestressing a concrete beam affect the strength of the beam?

Answer 26

Much stronger.

Question 27

During the tensioning process, what forces are applied to the concrete beam?

Answer 27

Compression

Question 28

What type of stress is reinforcing steel used to resist?

Answer 28

Tension

Question 29

What is the maximum compressive force that a concrete sample can resist if it could resist a tensile force of 500lbs?

Answer 29

5000 lbs (1:10)

Question 30

2 reasons why traditional reinforced concrete will deflect?

Answer 30

Rebar stretching and bond slipping.

Question 31

Purpose of tie downs.

Answer 31

Create a curve for uplift.

Question 32

What is used to tension a pre-stressing tendon?

Answer 32

Hydraulic jack