Is it normal for the collation of the page_title and page_touched fields in the page table to be set to latin1_bin while there is no collation set for any of the other fields?

I'm asking because it seems to be preventing me from using CONCAT() in a mysql query on a custom special page (although it's very likely that my limited knowledge of mysql is actually the problem ;)

i'm getting the following mysql error message: #1267 - Illegal mix of collations (latin1_bin,IMPLICIT) and (utf8_unicode_ci,COERCIBLE) for operation 'like'

thanks