I cannot seem to get rid of this weed that looks like grass. Can anyone tell me what this is
Get a little bottle of roundup and a pair of rubber gloves. Carefully wet your glove covered fingers and stroke a bit of glyphosate/roundup onto the leaves of this...crab grass. It will take a few weeks to kill the entire plant as this glyphosate is systemic and is transported to the roots where it kills the roots. Apply more if there is viable plant growth happening. Be very very careful NOT to spray, not to drip on any other plant material! Digging this grass up would be a waste of time. Keep the grass height NO LESS THAN 3". Your grass near the concrete is getting fried because it is too short and too near a major heat sink. Water deeply, allow to dry out before watering again.
This looks like a grass and may be hay of some sort. Could be fescue but the leaf looks finer to me like brome, timothy or orchard grass. Unfortunately, you can't spray it because the chemical that kills it will kill your other grass. I don't believe it is nutsedge. After looking at it, probably is K-31 which doesn't look good next to you bluegrass. Broadleaf and all, I hate it. Its hardy but I try to kill as much of it as I can. It is invasive!
The common name is tall fescue which is a bunching type of grass. It is also known as K-31, K31, Kentucky fescue or pasture grass. Sometimes cheap grass seed mixes will have tall fescue seed mixed in. If you only have it in a few places then it is easier to pull it out. Each year, the bunch of tall fescue will grow larger in diameter.