-
Set out slab size according to plans
for building.
-
Achieve final subgrade level by
screeding sand or crusher dust
-
Dig edge beams and footings as
required
-
Setup formwork to exact size of
slab, take care that formwork is straight and firmly supported
to withstand pressure of concrete
-
Lay plastic moisture barrier (seal
with duct tape where lapped)
-
Place reinforcement steel (lap as
specified by manufacturer) place barchairs at max 1000mm crs to
hold steel at the correct height (check plans for height of
reo).
-
Make sure reo is free from formwork
by 30mm to 50mm.
-
Check plans for control joints and
cut mesh if required.
-
Place pre-mixed concrete (adding
water to concrete can lower strength and increase shrinkage -
cracking).
-
Generally "slump" shall be 80 to 90.
-
Use a mechanical vibrator when
placing concrete, this will release air from the
concrete and
therefore increase the strength of your slab and minimise the
occurrence of shrinkage cracks.
-
Vibrating will add approximately 10%
to the volume of concrete required. Machine trowel the floor to
required finish (hand trowel finish will generally not provide
the same surface hardness).
-
Immediately after finishing floor,
cover floor with plastic or spray with curing oil in order to
stop evaporation (to cure to design strength moisture is
required in the slab)
-
Curing to design strength takes 28
days
