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Two 8"x8"x10' Douglas fir beams were tested. Both were 'damaged' with 0.125" thick saw cuts, 2.75" deep (fig 1). One specimen was tested 'as is', the other was repaired with FiberBond™.
The cuts were filled with an adhesive 'putty' and the beam was primed. Before the primer cured, 2 layers of FiberBond™ bi-directional carbon fabric were applied and allowed to cure for seven days.
During this test – the plain wooden beam reach a total load of 8.3 kips and the repaired beam reached a total load of 15.3 kips (fig 2 & 3), and still did not reach its failure point due to test fixture's limitations.
However this still showed an increase of up to 180% in load bearing capacity and a stiffness upgrade of about 150%.
Note the curvature of the wood beam (fig 2 & 3).
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