403A Formwork 2

Question 1

What is the main structural concern when designing formwork for a concrete slab?

Accepted Answer

Supporting the dead load of wet concrete and live loads during construction

Answer

Wind load on the form edges

Answer

Preventing the concrete from drying too quickly

Answer

Matching the thermal expansion of the reinforcing steel

Question 2

What are walers (wales) in wall formwork systems?

Accepted Answer

Horizontal members that stiffen the form panels and distribute the pressure from ties

Answer

Vertical supports that hold form panels together

Answer

Diagonal braces that prevent the forms from tipping

Answer

Bottom plates that anchor the forms to the footing

Question 3

What is the purpose of chamfer strips in formwork?

Accepted Answer

To create a bevelled edge on exposed concrete corners

Answer

To seal joints between form panels

Answer

To hold reinforcing steel in position

Answer

To create drip edges on overhead concrete

Question 4

In cold weather concreting in Canada, what is the minimum concrete temperature at placement recommended by CSA A23.1?

Accepted Answer

10°C

Answer

5°C

Answer

15°C

Answer

20°C

Question 5

What is the purpose of reshoring (backshoring) in multi-storey concrete construction?

Accepted Answer

To re-support previously stripped floors that haven't reached full design strength

Answer

To add temporary walls for wind bracing

Answer

To add vibration dampening during construction

Answer

To protect curing concrete from rain

Question 6

What material is most commonly used for residential foundation formwork in Canada?

Accepted Answer

Plywood and dimensional lumber

Answer

Steel panel systems

Answer

Aluminium forms

Answer

Fibreglass forms