Level 3 C4 Precast/Tilt Up

Question 1

One advantage of pre cast units manufactured in a plant is _______ control

Answer 1

quality

Question 2

The use of ____ _____ can reduce the rebar and concrete volume of a precast unit

Answer 2

stress cables

Question 3

The decision to use a mobile or existing casting yard is determined by the _____ and ______ of the units.

Answer 3

quantity and design

Question 4

On the jobsite, precast units can be secured to each other by using _____ and/ or weld plates.

Answer 4

dowels

Question 5

What is a pre cast pile?

Answer 5

a long structural member that penetrates deep into soil.

Question 6

What is a pile shoe?

Answer 6

It covers the tip of a precast concrete pile and protects it from damage while it is being driven into the ground

Question 7

_____ _____ are screwed in to protect the insert against being filled with concrete during the pour.

Answer 7

Plastic caps

Question 8

Pretensioning occurs before or after the concrete is poured?

Answer 8

before

Question 9

Why must prestressed cables be clean?

Answer 9

So that the concrete can bond TIGHTLY to them

Question 10

When does post tensioning occur?

Answer 10

After the concrete has achieved its design strength

Question 11

What type of buildings are tilt panels typically used on?

Answer 11

Buildings that are 2-3 stories tall

Question 12

To cast tilt up panels on an existing slab you must use a ____ _______

Answer 12

bond breaker

Question 13

In order to lift the tilt up panels, one type of insert used is a _____ _____ _____ _______

Answer 13

remote release system insert.

Question 14

When choosing a crane, several important points must be considered, one of them is the _____ of the panel.

Answer 14

weight

Question 15

What must be installed and secure immediately after the panel is set in place?

Answer 15

Braces

Question 16

For precise elevation control, tilt up panels are set on steel ___

Answer 16

shims

Question 17

Tilt up sandwich panels use what kind of insulation between the two layers (wythes) of concrete?

Answer 17

isocyanurate(Rigid Foam)

Question 18

What is the average energy savings of a tilt up sandwich panels?

Answer 18

20-60%

Question 19

What is a vital component of sandwich panels?

Answer 19

The connectors that tie the two layers together

Question 20

Concrete stairs are classified as either ______ or ______

Answer 20

interior or exterior

Question 21

Stairs require steel reinforcing, the mat is placed in the throat (sometimes called the effective depth) of the stair.

Placement is closer to the ______ because the load is from the top.

Answer 21

bottom

Question 22

Building code

Exterior stairs must be supported by piers 150mm in diameter or concrete foundation wall _____ thick

Answer 22

200mm

Question 23

The bottom edge of the riser board should be ______ to allow for troweling.

Answer 23

beveled

Question 24

What are the 2 major components of bridges?

Answer 24

• An upper superstructure

- A lower substructure

Question 25

Why are pre cast components used extensively in bridge construction?

Answer 25

Because of the longer spans and lighter weights of the units.

Question 26

Concrete _____________ are used to support the superstructure girders.

Answer 26

bridge seats/ bearing plates

Question 27

____ _____ can be used to support pier cap formwork

Answer 27

Friction collars

Question 28

What is a diaphragm ?

Answer 28

A short wall used between sections or girders.

Question 29

What supports the ends of the bridge structure?

Answer 29

Abutments and piles

Question 30

The use of _____-_____ cables supports more tensile strength and allows greater spans.

Answer 30

post-tensioned