Stone Arch Viaduct / Bridge

[railandsail]

Here is an article about making molds and building a stone arch bridge. http://www.gatewaynmra.org/2010/casting-...h-viaduct/

I recall seeing this one before, but I just reread it. I like the idea of the individual arch molds, but think I want to make my separation down the columns rather than in the center of the arch. Then my separate 'proud column pieces' would cover that seam.

I also like the idea of supporting the mold with sand (or whatever), as then I could make a few of those arches that need to be curved?

I'm not particularly excited about the thickness of his arch pieces. Can they be made thinner?...with reinforcement materials?,...particularly if they are just going to be 'decorative facings' placed on PVC foamboard substructure? (I wonder why he needed such thick castings on those robust wood framing??