Pouring Concrete next to wooden header

I want to pour some concrete next to my house but just above my foundation wall is a wooden header (probably 2 - 2X8s on edge) that is about 8 inches tall. I wanted to pour the concrete up to the bottom of my door but this will cover the wood. Is this a problem? Someone told me that the concrete would rot out the wood. If this is true can I cover the wood with something to prevent rotting?

Thanks