Formwork for foundation walls

Question 1

Considering cost durability and reuse the most commonly used sheathing material used for formwork is

Answer 1

Plywood

Question 2

List three categories in which items required for formwork system can be itemized

Answer 2

Plywood structural members, additional accessories, backer, form, tie hardware

Question 3

Braces for formwork are most effective, if they are placed at an angle of ___, to ___ the horizontal

Answer 3

45° to 60°

Question 4

Considering the formwork must eventually be dismantled give three things to consider when using nails

Answer 4

The number of nails, the nail type, duplex, adequate length and thickness for max holding power

Question 5

List six items that may be used to give more rigidity and help align panels for wall forming systems

Answer 5

Studs plates, wailers, strong backs, kick plates braces

Question 6

List three items to consider when selecting form ties

Answer 6

Compatible with the type of wailers used correct length for the thickness of the wall

Question 7

Why are vinyl water stops serrated

Answer 7

It prevents the water from seeping around the stop

Question 8

When would dumbbell shaped water stops be adequate for use in concrete joints

Answer 8

We’re a little to no Shear movement is expected

Question 9

Rough box should be made at least ___ mm narrower than the concrete wall thickness

Answer 9

2-3mm

Question 10

When should the centre bulb water stop be used in concrete joints

Answer 10

Where Shear Movement is expected.

Question 11

What is the proper method of splicing PVC water stops on the job

Answer 11

Straight square cuts

Question 12

Why must the centre bulb of the water stop be centred on the joint?

Answer 12

To allow movement

Question 13

Why are keyways usually tapered rather than square or rectangular?

Answer 13

To be easily removed from the concrete

Question 14

Describe how to form a control joint in the foundation wall

Answer 14

By attaching a bevelled strip of wood sheet metal, rubber, or plastic to the sheathing of the wall form

Question 15

Crack control joints are required in concrete foundation walls if they exceed ___ in length

Answer 15

25

Question 16

What is the combined thickness of the two strips used to form for a control joint in relation to the wall sickness?

Answer 16

1/4-1/5 the wall thickness

Question 17

What is a construction joint?

Answer 17

Used when there is a stoppage in a poor and continues later

Question 18

What is a control joint?

Answer 18

Used when there is a weakening of the concrete wall or slab in order to control. We’re cracking will take place.

Question 19

What is an isolation joint?

Answer 19

Used as separation of the concrete from objects that may be damaged behaving or expansion of the concrete

Question 20

After concrete forms have been dismantled, there are four areas of maintenance that must be considered. What are they?

Answer 20

Cleaning, repairing and oiling handling and storage hardware maintenance

Question 21

Why should forms be cleaned of concrete immediately after dismantling?

Answer 21

The sooner cleaned the easier to do less damage is caused, and where to the forms

Question 22

Why should a wire brush not be used to clean plywood forms?

Answer 22

It will loosen fibres on the form face

Question 23

What should be done with split or cracked material

Answer 23

Get rid of it

Question 24

For transporting forms and storage stack the forms

Answer 24

Face to face and back to back

Question 25

Why are ties with plastic cones sometimes used?

Answer 25

Set a wall dimension and cover the plywood hole after the hole is stripped the cone and tie removed

Question 26

What is meant by the break back on snap ties?

Answer 26

I want Hearne device to break after use

Question 27

Why can ties rated at different strengths in the same wall cause a blowout?

Answer 27

It causes a momentary rise and pressure and weekends

Question 28

What is the rate of poor, also known as the rate of placement?

Answer 28

The distance, the concrete rises in the form in one hour

Question 29

While placing concrete in wall forms on a warm day, the pressure on the forms would___ faster compared to place in Concord on a cooler day

Answer 29

Decrease faster

Question 30

Impact on concrete forms may be caused by vibration, and

Answer 30

Dropping from to high