I was considering that there seems to have been no mention of using pre-stressed materials near the edge of the "beam"... Carbon fiber for example.

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Layer - High binder %, small aggregate
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Layer - Carbon Fiber (mesh allowing for binder flow)
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Layer - Low Binder %, Optimal packing
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Layer - Carbon Fiber (mesh allowing for binder flow)
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Layer - High binder %, small aggregate
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Cured in a frame that allows the Carbon fiber to be put in tension during the cure.


thoughts ???