How do I maintain expansion joints?

Make sure the top of the expansion joint is sealed with an expansion joint material, elastic epoxy seam sealant or silicone caulk capable of expanding.
 

What type of material should I use to fill an expansion joint.

You can fill an expansion joint with silicone caulk, however it is recommended to use an elastic epoxy seam sealant after the grout is fully cured, such as Chockfast Expansion Joint material.

Do I need to seal the expansion joint to the prepared foundation?

It is recommended that the expansion joint be sealed to the top of the prepared foundation with a silicone caulk (RTV).

What can I use to seal the expansion joint to the prepared foundation?

Generally, the expansion joint is sealed to the prepared foundation with a silicone caulk (RTV).