Which concrete mix for a small drain repair/fix?

[dishman]

I have noticed an existing clay drain gully is slightly off centre when it was installed. For what reason this was done, I know not.

This means it is not directly connected to the clay drain below. This is just a rain water gully.

This means there is a slight gap which needs to be filled.

It is something I can fix properly in the future, but for now I would like to fill the gap with a temporary but suitable filler.

I assume I can fill it with concrete, but is there a certain mix that is suitable, or will any readymix do?

I also have some gravel which I assume I can add as an aggregate to give it a bit more strength for an initial layer, and top off with a smooth layer. Does this sound like a good idea plan?

Many Thanks

 

[blup]

Rapid setting cement?

Blup

 

[Diver Fred]

1 Cement,
2 Sand,
3 (20 mm) stoneC

or
1 Cement
5 Ballast

or if you want a weaker mix
1 Cement
6 Ballast

 

[^woody^]

If the gully is not connected to the drain, then surely it will be leaking and that needs dealing with sooner rather than later, and concrete won't help.

 

[nickjb]

I used the drain repair mortar to patch up the hopper at my father's house a few years back. Its held nicely. Was quite good stuff to work with. Held its shape and was fairly sticky. https://www.diy.com/departments/u-can-waterproof-repair-mortar-5kg-tub/237084_BQ.prd

 

[dishman]

If the gully is not connected to the drain, then surely it will be leaking and that needs dealing with sooner rather than later, and concrete won't help.

Agreed...it is certainly not ideal. I only noticed it after a small patch repair to the drive nearby. It must have been like this for nigh on 30 years without any signs of serious issue. But it does need to be sorted at some point.

The natural water level of the drain is much lower down, and on a water drain test all the water poured down the drain, so while I'm sure there is some escaping into the gap, it seems to be a slow burn issue.

Hence, I thought a quick stop gap of plugging the gap with an appropriate concrete mix and sloping it so it directs water the right way.