What type of cement do I use for a drain inspection chamber

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Hi I have a crumbling drain inspection chamber which is shedding bits of concrete into the drain with obvious consequences, I have tried 4/1 sand cement 4/1 sharp sand cement but it still cracks away after the frosts , what mix materials should I use so this wont happen ?
Thanks in anticipation of answers
 
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Hi I have a crumbling drain inspection chamber which is shedding bits of concrete into the drain with obvious consequences, I have tried 4/1 sand cement 4/1 sharp sand cement but it still cracks away after the frosts , what mix materials should I use so this wont happen ?
Thanks in anticipation of answers

bump
 
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Benching is the concrete at the bottom of the chamber that slopes up from the half channel.
 
Papag1";p="1881567 said:
Yes if that's the name for the concrete that surrounds the chamber which is crumbling.
it`s not that - it`s render - and hasn`t been used on inside of manholes for donkeys years - probably in the 1940`s last :eek: They went to rendering the outside of the brickwork because it all comes off like yours is :idea: Just chip it off and leave the brickwork alone ;)
 
If just trying to gob up the face of the chamber, anything you try to use will just get blown off after a while.

If you want something to actually stick, then you will need some sort of epoxy mortar product, and a sound keyed wall to stick it to

But is this job really necessary?
 

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