Quicklime (calcium oxide) silo with an old expansion joint that's been patched with silicone and Teflon. It's time for this one to be replaced to keep quicklime from plugging up behind the expansion joint and leaking or failing entirely.

Quicklime (calcium oxide) silo with an old expansion joint that’s been patched with silicone and Teflon. It’s time for this one to be replaced to keep quicklime from plugging up behind the expansion joint and leaking or failing entirely.