Is there a past form of the word cementation?

While "cementation" is a noun, it's derived from the verb "cement." The past tense of "cement" is "cemented."

Here's how you could use it in a sentence:

* "The two pieces of wood were cemented together with strong adhesive."

If you're talking about the process of cementation itself, you wouldn't use a past tense form, as it refers to the action or process, not a single event.