Fill in milled grooves in concrete ceiling

[Parven]

Hello
We have milled tracks in our concrete ceiling to lay in VP tubing. The tubing is now in place and the tracks need to be refilled.

What material should be used to ensure it adheres to the concrete without falling down? We have purchased cement as it worked perfectly for similar work on the walls. But now gravity makes it more challenging.

Has anyone done this before and have any good tips?

 

[myrstack]

I have personally used both cement-based plaster and adhesive for tile setting with good results (the latter more as a use-what-you-have-at-home than planned though). Some brands have a specified mixing range, and you'll get a pretty thick consistency with the lower amount of water. If it's really difficult, you can of course use even less water for a more paste-like consistency, but keep in mind that the strength and other properties will change. If you're just holding up VP pipes, it might not matter as much.

What I noticed when I was working was that it's extremely important for the VP pipe or hose to be properly fixed before you apply any mix. Otherwise, it's going to be a nightmare to secure. Also, remember to pre-water with a spray bottle or apply a round of primer first, so you don't draw all the water out of the mix immediately. This is especially important if you're using less water than specified.

// Mats

 

[tompa_70]

Have done this and proceeded as follows. Fastened the vp-pipe securely with clamps. Wetted the plaster with a masonry brush/large brush. Plastered with gipsputs/Gypsum and pressed firmly so the paste surrounded the entire pipe/hose. When it dried, I plastered the entire ceiling (I don’t know what finish you plan to use tbh).