Concrete type stuff around window sides, broken off

[Mattatooi]

Got all windows and doors "seals" fixed few years ago when we moved in, builder put this concrete type stuff, not sure whats its called, around all window/doors on the sides. They are all fine, except this kitchen window one. The window opens outwards, from bottom outwards, hinged at top. Its quite close to wall, and I think what has happened this has possibly made it all come off ?

Here is large bit that just came off;





Its just one side. What is best way to fix this on my own? Can I just use some sort of silicone sealant?

Thanks

 

[Mattatooi]

Anyone?

 

[ronniecabers]

Just pull it off and silicone it, if you don'rt make a good job with the silicone , you could put a piece of plastic trim up as well