The transaction log records aren't committed to data pages. The data modification is made to the data pages (in memory) and then logged into the transaction log. The only time you get replay from the log is in database recovery or restores (or on the mirror DB in database mirroring).
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability