G2 - Select Concrete Forming Systems Flashcards
If the allowable deflection is 1/400, how much deflection can there be over a span of 1.6 metres?
4.0 mm
What effect does rapid concrete placement have on forms?
It may cause them to fail
Which of the following are used to create a three-dimensional pattern on the face on a concrete wall?
Rustication strips
What are three main objectives in concrete formwork construction?
Safety, architectural design and efficiency
What is the correct shape and placement of a rustication strip?
Bevel the stock and place the wide side to the form
What determines the amount of deflection in formwork sheathing?
The spacing of studs or supports
What loads are false work designed to take for suspended slabs / beams / girders?
Previously placed concrete, workers and equipment
When placing concrete, why can the form pressures at the bottom of column forms be very high?
Because they are usually filled to the top in one placement and fully vibrated
Which of the answers below is a major factor that effects the pressure on formwork?
Rate of placement
What is a main disadvantage of molds and liners used in formwork?
To strip the formwork the molds will most likely be destroyed.
What is the purpose of a test block?
To show the quality and finished surface of the concrete
Why is bush hammering rarely done for a finished concrete surface?
Question 12
It is very labour intensive
Why are gap-graded aggregates used for exposed aggregate?
It makes an even, pebbled look
How do you expose the aggregate when making an exposed aggregate finish?
By removing the cement paste shortly after the concrete has set.
For architectural concrete, the location of ties is very important.
True
