The photo below shows the chamber under a manhole at my house. There's a horizontal channel formed in concrete (perhaps there's a clay half pipe under it?) that is connected to a clay pipe leading to a toilet.
That connection appears to have been sealed with something like mortar or cement that has cracked leaving a small (maybe 1/4 inch across) gap between the clay pipe and the concrete. When there is water in the drain, I can see it running into this gap, and I'm worried not only about sewage regularly seeping into the soil under my patio, but also about a void forming.
The junction is very much accessible and I can easily scrape out the loose material and replace it with something. However, I've no idea what.
Apologies for the very basic question, but what should I be using use to fill this gap?
That connection appears to have been sealed with something like mortar or cement that has cracked leaving a small (maybe 1/4 inch across) gap between the clay pipe and the concrete. When there is water in the drain, I can see it running into this gap, and I'm worried not only about sewage regularly seeping into the soil under my patio, but also about a void forming.
The junction is very much accessible and I can easily scrape out the loose material and replace it with something. However, I've no idea what.
Apologies for the very basic question, but what should I be using use to fill this gap?
This is fortunately quite a shallow chamber - I can easily reach the crack whilst keeping my head well outside. There are much deeper manholes further along the patio and drive where I wouldn't attempt a repair myself because I wouldn't have any confidence that I'd be safe doing so. It's a fair warning and good advice - thanks!
