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Old 11-13-2009, 07:48 PM
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Default Oh no, my arch didn't stick to the floor!

The bricks comprising my arch seem to have stuck to one another. I have doubts about the quality of the bonds because some of them broke while I was setting higher bricks of the arch and then set with obvious cracks running the length of the gap, but nevertheless, the bricks of the arch do seem to be stuck together a least to some degree.

...however, on both sides, the first brick is completely unbonded from the row of bricks that run out the entryway framing the floor. Both mortar gaps are obviously completely broken. A slight push will tilt the arch up on its feet, either inward or outward along the main axis.

What can I do about this? On one hand, the load-force at the floor is going almost straight down into the floor so the arch-floor bond isn't very important, but on the other hand, I am concerned that the dome courses will push the arch outward. I had intended to build more of the total archway before merging the dome to the arch anyway, so the more external components of the arch (under the vent primarily) would provide a brace against outward pushing, but nevertheless, I am concerned about this problem.

Should I gingerly tip the arch over, clean of the area of old mortar, then try to reattach it? How would I clean off mortar that is several days old? I'm afraid that something as violent as an angle grinder would break nearby joints while I am working.

A little dismayed, awaiting advice.

Thanks.
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Old 11-13-2009, 08:02 PM
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Default Re: Oh no, my arch didn't stick to the floor!

I'm not sure I understand. My arch sits directly on the FB Board and is not attached to it at all. Gravity keeps it in place. So I'm not sure I understand the problem. Can you explain it one more time for the dumb lawyer?
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Old 11-13-2009, 09:43 PM
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Default Re: Oh no, my arch didn't stick to the floor!

I'll try to get my CAD design up to date and post it. In the meant time, if you arch isn't fixed down, what prevented the dome from leaning against it during your build and pushing the arch outward? Did you completely build the entire outer arch, vent support and everything, before starting the dome so the arch would have lots of back support against any pressure from the dome?
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Old 11-13-2009, 09:47 PM
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Default Re: Oh no, my arch didn't stick to the floor!

Well, I've looked at your thread and I see what you did. You brace the lower part of the arch but built the entire dome up with no support for the arch against outward pressure from the dome...and apparently you didn't need it. Maybe I won't worry about it too much.

Thanks.
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Old 11-14-2009, 06:04 PM
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Default Re: Oh no, my arch didn't stick to the floor!

"Should I gingerly tip the arch over, clean of the area of old mortar, then try to reattach it?"

I wouldn't count on the mortar "gluing" the arch in place. Mortar has very little tensile strength. The primary purpose of the mortar is to transfer load between surfaces and, to some degree, supply shear resistance. Design your arch so it supports everything by gravity alone.
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Old 11-14-2009, 06:34 PM
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Default Re: Oh no, my arch didn't stick to the floor!

Done and done. Thanks.
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