The fact that carbon-fiber-reinforced polymer (CFRP) is strong enough to replace bulkier strengthening materials can be a surprise even to some experienced commercial contractors. After all, carbon fibers are only 5 to 10 microns in diameter, a little wider than spider silk.

Intuitively, it doesn’t seem that these tiny fibers could be a major component of a concrete strengthening system several times stronger than mounted steel plates.
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