h a l f b a k e r yLike gliding backwards through porridge.
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Gabions are those wire mesh cages which contain rocks in order to create fences or embankments. They work well - but all that wire mesh is downright fugly. [links]. The idea is to form the structure using standard mesh which is first coated in petroleum jelly or any other non-stick surface.
Before
the rocks and boulders are placed into the gabion, they are tumbled in a solution of ethyl cyanoacrylate (superglue basically) to give each stone a thin coating. Once the glue has set, the wire mesh is removed and you now have an attractive fence (or whatever) which is self-supporting and cohesive. Not worth doing for prosaic erosion control purposes but well worth it for home or commercial landscaping designs. The cyanoacrylates can be mixed with retardants to slow the setting time if required.
Images of gabions
http://www.google.c...429,r:11,s:23,i:185
[AusCan531, Aug 27 2012]
Another image showing off the ugly mesh.
http://www.google.c...429,r:10,s:23,i:182
Imagine how much better this would look without the wire. [AusCan531, Aug 27 2012]
[link]
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According to Wikipedia the compound 2-octyl cyanoacrylate is a medical grade glue; it was developed to be non-toxic. I suppose cost would be a factor, but any patents have long since expired so if you went to the manufacturers with bulk orders you'd get it a heckuva lot cheaper than you and I now pay for the tiny 15 ml packs of superglue we buy at the hardware store. |
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Big rocks do not superglue well. |
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Don't know what technologies are being used, but exposed stone walls seem to be the national economy of Ireland, for example. |
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Unless you manage to glue a very large portion of the surface, the rock will shear. |
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Unless the rocks are meticulously cleaned,
the glue won't adhere. |
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Tumbling the rocks in glue will waste a lot of
glue. |
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The glue, if exposed to weathering, will slowly
hydrolyse and degrade. |
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Assembling gabions by hand, using cleaned
lumps of rock and polyester adhesive would
be perfectly practical- just like, as [4and20]
points out, dry-stone walling. |
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While this would be slow and extremely
labour intensive (compared to filling a metal
cage with a mechanical loader), it would be
far more aesthetically pleasing when
complete. |
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I keep reading this as "Superglued Gibbons". |
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Alternatively, why not mix the caged rocks with a
blend of fibres, soil and seeds? The fibres would
hold the soil in place until the seeds germinated and
grew, then their roots would further stabilise the
interstitial soil. The plants would grow through the
wire cage, concealing it from view and providing a
pleasant rockery effect. |
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Often, they're used immersed, either to
protect bridge footings or as part of sea
defences.
Left to their own devices on land, vegetation
colonizes them fairly rapidly without any
encouragement. |
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Baked- gabions were originally wicker
cylinders filled with earth used as part of
military fortifications. |
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Wicker than what, though? The problem is that
wicker rots, so you'd have to rely solely on the plant
roots to hold things together in the long term. Plus
I suspect that a wicker cage capable of holding a ton
or two of rocks would be infeasible. |
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Part of the attraction of the decorative gabions are the open gaps in the stone - like the bottom middle picture in the first link. [8th] makes a good point about cleanliness of the stones, but if you already have them in an agitator/tumbler they will be easy to clean before adding the glue or resin. |
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The actual adhesive might need to be amended for longevity and provide a slight bit of flexibility, but who cares about wastage of the glue as long as it dries clear and doesn't cost too much - it will still be cheaper than hand labour placing individual stones. |
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[Max]'s idea about mixing in a blend of fibres, soil and seeds is well and truly baked nor is it the aesthetic I'm after. The same with [bigsleep]'s concreted boulders. With the strength of modern adhesives and the fact that the cage will help the boulder's tumble into somewhat stable positions before the glue sets I don't believe [FT]'s comment about shearing is unsurmountable. |
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I have some acrylic polymers at work I might have a play with at least on a small scale. Mine will probably soften in the heat but can at least demonstrate the principle. |
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I keep reading this as Gambians. They always stick
together. |
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