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RE: Expansion Joints in concrete slab

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Gautam:

If the SOG is an interior slab (not exposed), you probabaly don't need an expansion joint. All you need is an isolation joint (which also acts as an epansion joint), a construction joint or a a contraction joint.

The most specific set of recommendations for joint spacings is given by the PCA guide. This guide recommends that the joint spacing (in feet)shall be 2 to 3 times the slab thickness in inches for plain concrete. For example, if the slab thickness is 6-in, the joint spacing could be any thing between 12-ft to 18-ft.

The choice of isolation joint (which is generally a separation between two panels of slab,or between slab or some other element of structure), contraction joint (which is basically a saw-cut notch, filled with sealant) or a construction joint (just a gap between old & new concrete due to break of days work, with 50 % of rebars continuing across the joint) really depends on the slab panels emerging out of grid sizes. Its basically a designer's discretion to handle such a problem and assign such joints.

For more details you may refer to the following publication:

                        DESIGNING FLOOR SLABS ON GRADE
                                     By:
                          B.C. Ringo and R.B. Anderson 
                                The Aberdeen Group.

Best regards,

Syed Faiz Ahmad; M.Engg, M.ASCE
Senior Structural Engineer
Saudi Oger Ltd
Riyadh, Saudi Arabia  

-----Original Message-----
From: G M [mailto:newabhaju(--nospam--at)hotmail.com]
Sent: Monday, October 27, 2003 10:40 PM
To: seaint(--nospam--at)seaint.org
Subject: Expansion Joints in concrete slab



I am working on a 200 + feet of slab on grade footing for a multiple houses. 
Can anyone direct me to expansion joint requirements.

Gautam

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