Another cracked concrete lintel question

[Chris669]

Good morning all,

First Post here so apologies if its not in the correct section.

Recently bought a house and started chipping away old plaster that was blown in multiple places.. When I removed it from the lintel I noticed a few cracks in it.. House was built in the 50s..

Not having much experience with cracked lintels, can anyone advise is this is a major problem?

 

[Dereekoo]

Looks like a cast in situ lintel, I assume its a boot lintel ( view on outside wall a concrete ledge above window 100mm thick ?) Main part of lintel carrying inner wall loads looks sound enough albeit with a slight crack, its been ok for 70 years and should be ok for another 70. Outer section look like it is spalling due to water ingress rusting reinforcement and expanding. Couldchip away damaged concrete clean reinforcement and rebuild with some epoxy resin mortar. Assume there is no cracking of outerwall brickwork?

 

[Deleted member 292770]

you will have to break the outer cracked section off. sit a new single lintel over the brickwork outside.
there will also be a bitumen layer inside the cavity directing moisture and water out. this will be cracked and need replacing with a modern dpc.
the broken bitumen is the reason for the water ingress into the concrete causing it to rust and blow.