G2 Flashcards
Footing forms are built with usually what size lumber?
2X6, 2X10, and 1X4 cleats
what are bulkheads used for?
creating a vertical or horizontal (usually vertical) end to formwork
what are two uses of chamfer strip?
bevel corners of the formwork to give the concrete a nice finished edge. And a levelling strip for troweling
witch may be more permanent than the other, scabs or cleats?
Cleats
what are dowels used for?
connects two separate concrete members together
how are threaded dowels installed?
drilled hole and a threaded insert is placed and the dowel can be threaded in
what is the purpose of an isolation joint?
to isolate on concrete member from the other
What are isolation joints usually used for?
Columns and slabs
how is an isolation joint made?
using ash fault impregnated fibreboard
whats the difference between a key and a keyway?
a key sticks out and key way is a grove that sticks in
what is a ledger?
a horizontal member that a slab form sits on at the wall, like a ledge
what is a rustication strip?
a strip of wood the creates a joint. similar too a keyway
what transfers the load between the sheathing and the ties?
walers
how often are support blocks used if needed under walers?
every 1200mm
what is placed between a construction joint that is subject to hydrostatic pressure?
a water stop
what is in the middle of a water stop?
a bulb to resist the shear faces of two concrete members
what is the dimensions of wedges?
3 1/2 x 12 inches
what is used to keep a form plumb?
braces
Cleats for footing forms are usually placed at?
24 or 36 inches on certer
what is a factor when placing clamps on a column form?
clamps must be closer together at the bottom
what is it called when the concrete is cured with steam in precast concrete?
autoclaving
what should happen to the rate of placement if the temperature falls?
the rate of placement should be reduced
the pressure exerted by the fresh concrete is dependant on what?
the rate of placement and the rate concrete sets
what lumber type is used for forming?
2 and better
what type of plywood is used for forming?
Douglas Fir Plywood (G1S)
Ply grain should run in witch direction?
opposite too the studs
what form material is used for precast?
Metal
Quick strip ties have what?
holes on the ends for waler bar
strap ties have what?
holes for nails
what is a reglet used for?
a continuous grove that have counter flashing caulked in them
How deep are reglets?
25mm
what are form liners used for?
used to impart a texture on the surface
for exposed aggregates, what aggregates are used?
Gap graded aggregate, they are coarse and 3/8 inches in diameter. the rest is sand
what is sprayed on the surface to produce exposed aggregates?
A retarder to keep the surface from curing
what diameter is pencil rod?
1/4 inch
what seals the form tie in form liners?
Rubber washer
what are form liners made from?
foam rubber and styrofome
what is a give and take strip used for?
to isolated one concrete member from the other
whats the difference between isolation joint and expansion joint
expansion joints allow the concrete member to expand and contract where the isolation joint allows it to settle and move around
the usual spacing for control joints are no more then?
15m
control joints must be how for down into the slab?
at least 1/4 the thickness of the slab
