Hi
new to this casting thing but have read a little but haven't really figured it out. Planning to cast a fireplace, have built the frames to be used and bought 4* pre-made reinforcement meshes size 120*80cm, the fireplace will be square with possibly rounded outer corners.
I have a few questions I'd like some input on,
the thickness of the casting is planned to be 15cm, is that okay considering the durability, etc.?
I have bought coarse concrete in 25kg bags, will it withstand the temperature fluctuations between winter and fire, or is something else required that is fireproof?
Does it need to be watered? Or covered? How long should it dry approximately to withstand weather and wind?
Best regards, Daniel
new to this casting thing but have read a little but haven't really figured it out. Planning to cast a fireplace, have built the frames to be used and bought 4* pre-made reinforcement meshes size 120*80cm, the fireplace will be square with possibly rounded outer corners.
I have a few questions I'd like some input on,
the thickness of the casting is planned to be 15cm, is that okay considering the durability, etc.?
I have bought coarse concrete in 25kg bags, will it withstand the temperature fluctuations between winter and fire, or is something else required that is fireproof?
Does it need to be watered? Or covered? How long should it dry approximately to withstand weather and wind?
Best regards, Daniel
Concrete is unsuitable for fireplaces. At high temperatures, the concrete fragments with an explosive force equivalent to TNT. Use fire-resistant brick and mortar intended for that instead, or construct it so that the concrete parts are at a proper distance from the fire - for example, with gravel in between.
Concrete can be made resistant to fire, but that is probably overkill in this case.
Concrete can be made resistant to fire, but that is probably overkill in this case.
Ok, thanks for your response.
I was thinking about those well rings that are placed in, for example, playgrounds and are used for fire and grilling, what are they cast with?
fireproof bricks and mortar, is it laying bricks stone by stone or can you stack the bricks in the frame and then just pour the mortar over?
I was thinking about those well rings that are placed in, for example, playgrounds and are used for fire and grilling, what are they cast with?
fireproof bricks and mortar, is it laying bricks stone by stone or can you stack the bricks in the frame and then just pour the mortar over?
There is concrete in the rings, but I would guess that the thin cross-section combined with a lean mixture (a lot of aggregate relative to cement) allows it to withstand. Furthermore, it's rarely the case that the hearth is directly against the concrete.
I have participated in full-scale fire testing at SP in Borås and have seen spalling in connection with real fires, so I have great respect for this. Particularly, moisture-saturated concrete is extremely dangerous when exposed to fire.
A brick construction is built brick by brick - I don't think there are any shortcuts, but I'm not a bricklayer.
I have participated in full-scale fire testing at SP in Borås and have seen spalling in connection with real fires, so I have great respect for this. Particularly, moisture-saturated concrete is extremely dangerous when exposed to fire.
A brick construction is built brick by brick - I don't think there are any shortcuts, but I'm not a bricklayer.
Okay, that doesn't sound fun.
I called the technical support at Finja Betong and they said that concrete should never be used for fire, but if I do like the park with soil etc. at the bottom, it wouldn't be a problem since the fire is not directly on the concrete.
Should I trust that?
I called the technical support at Finja Betong and they said that concrete should never be used for fire, but if I do like the park with soil etc. at the bottom, it wouldn't be a problem since the fire is not directly on the concrete.
Should I trust that?
We have a grill made from an iron culvert. The grill now needs renovation. The interior, where the charcoal bed should be placed, needs to be filled. What should/can it be filled with? Soil, stone, gravel?
sand