Hi,
I'm planning to "set" rebar in rock, thinking of using 12mm rebar with expanding concrete and 20mm holes. I'm then planning to pour foundations for deck posts as well as foundations for a 50cm retaining wall.
I tried some holes yesterday and had difficulty with the rebars. First, I filled the hole partially and tried to insert the rebar, but it didn't work. So I quickly had to drill out the "mixture," mix a new batch (a bit looser), and hold it in place when the rebars were in. But it feels better to fill with concrete first, then the rebar, and then top fill a bit.
What size holes should I drill? I can either decrease the size of the rebar or increase the drill size. But a larger drill size means more time for each hole, and a smaller rebar means a weaker structure.
I'm aware I can use chemical anchors, but they are so damn expensive. There are 75 holes to fill
If I use 12 mm rebar and need 14mm holes (hole size + 2mm) and go 100 mm deep, the volume to be filled should be 4.1 ml => there are 300 ml in a tube => max 2 tubes. But that doesn't seem reasonable. Gunnebo says 16mm holes and 3 tubes. In that case, it's easier and safer to use the chemical anchor. Thoughts?
/ Viktor
I'm planning to "set" rebar in rock, thinking of using 12mm rebar with expanding concrete and 20mm holes. I'm then planning to pour foundations for deck posts as well as foundations for a 50cm retaining wall.
I tried some holes yesterday and had difficulty with the rebars. First, I filled the hole partially and tried to insert the rebar, but it didn't work. So I quickly had to drill out the "mixture," mix a new batch (a bit looser), and hold it in place when the rebars were in. But it feels better to fill with concrete first, then the rebar, and then top fill a bit.
What size holes should I drill? I can either decrease the size of the rebar or increase the drill size. But a larger drill size means more time for each hole, and a smaller rebar means a weaker structure.
I'm aware I can use chemical anchors, but they are so damn expensive. There are 75 holes to fill
If I use 12 mm rebar and need 14mm holes (hole size + 2mm) and go 100 mm deep, the volume to be filled should be 4.1 ml => there are 300 ml in a tube => max 2 tubes. But that doesn't seem reasonable. Gunnebo says 16mm holes and 3 tubes. In that case, it's easier and safer to use the chemical anchor. Thoughts?
/ Viktor
Ended up using 16mm holes for the 12mm reinforcement and anchoring compound. It will be a bit more expensive, I don't think 3 tubes will be enough, but it's smoother than having to mix a lot of concrete to hold it in place. Moreover, I would probably have had to increase the drilling size significantly to use expanders and 12mm rebar. The 16mm holes are quick to drill. That, combined with the fact that anchoring compound feels "bulletproof," made me stick with it