Rooks Endgame

In this game (a 3' blitz game), both my opponent and me ended up with the 2 rooks and some pawns. We played an interesting endgame, where I won using the "bridge" technique after a pair of rooks was traded:

I'm not good at endgames (specially at rook endgames), so any help will be appreciated.

I know it's been a long time, but why didn't you 53.... Kb1? maybe i'm missing something, but after that you should be able to promote your pawn without much trouble, right?

@Picard89 In Blitz games, you normally miss the fastest way to win when you're thinking about other ways to win.

I know that, and in bullet it's even worse :S, but what kind of advice where you looking for here?

I was asking how to improve white's position. I would never have played 20.Ra1??, for example.