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Construction and Design of Multistorey Building
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SLAB STAGES
IMPORTANT COMPONENTS
Key in column
Water bar
Binding materials
Expansion joint
KEY IN COLUMN
since the height of column is very large, hence it is not possible to cast the column at one time, to cast the column later the key is made at the junction so that the proper bond between the old concrete and new concrete is formed.
KEY IN COLUMN
EXPANSION JOINT
Since concrete is subjected to volume change. Provision must be made to cater for the volume change by way of joint to relieve the stresses produced.
Expansion joint is function of length Buildings longer than 45 m are generally provided with one or
more expansion joints. Material used as expansion joint material is armour board
whose thickness is 25 mm.
EXPANSION JOINT
Expansion joint material, size is 25 mm
Expansion joint in building
WATER BAR
Water bar is provided in the retaining wall o that the moisture can’t move from the soil to the joint. Water bar is basically provided at the constructions joints of retaining wall of two different towers
WATER BAR
BINDING MATERIALS
Since the thermal expansion of concrete is different from that of masonry. The interface between the concrete and the masonry is liable to crack. To avoid this crack the chicken wire mesh is used to avoid the crack and also provides the better grip for Masonry with concrete.
Similarly when the drainage pipes are laid along with the outer wall then again the connection between the pipe and the wall has different coefficient of temperature change hence they are joint to the concrete by lead keys.
In the toilets and kitchen sunken portion the joints in any case are packed by water proof and non shrinkable material.