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186 (Structural) (OP)
27 Mar 03 8:23
Where i come from the weather is hot n wet all year round (amazon like weather). For a structure which is about 100 metres (300 ft)long by 3m(9ft) wide , is it possible to avoid expansion joint as it had always been a source of water leakages. The temp variation is 27 c to 35c.
If exp joint is a must pls suggest ways of preventing leakages.
Rjeffery (Civil/Environmental)
27 Mar 03 8:53
hold the crush strip 1.2 to 2 cm below the surface of the slab, add a backer rod and caulk with flexable acrylic or latex caulking.  turns into a maintenance issue (to renew the caulking) but it will save on cracked, damaged, dislpaced, leaky slabs.

Good luck.
JedClampett (Structural)
27 Mar 03 9:25
If you are really interested in providing a leak free joint, follow Rjeffery's advice and also have a nine inch center bulb PVC waterstop embedded in the joint.  Greenstreak (http://www.greenstreak.com/) makes some appropriate products.  The backer rod and caulk will keep material out of the joint and allow free movement and the waterstop will provide the barrier.
Helpful Member!  Ron (Structural)
27 Mar 03 9:27
While I agree with the joint configuration, use either a 2-part urethane sealant or structural silicone rather than latex or acrylic sealants, which are not durable enough for your application.

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