## 3 Results and Discussion
### Compression Tests
#### 3.2.2 Reinforced Pieces  
The strength-strain graphs for the reinforced pieces (Figure 3) show a very similar type of behavior for the three reinforcement types used--following an initial linear phase, the graph loses its linearity and reaches the maximum load after which the strength reduces in value until a strain is reached that provokes the breakage. However, there are significant variations in the value of the mechanical properties inferred in the graphs (Table 2). The value of the maximum strength reached is very similar with both basalt reinforcements and significantly higher, by between 18% and 20%, than the maximum strength of the test pieces reinforced with carbon fiber. The strain reached for the maximum strength value is also very similar in both basalt fabrics and lower, by between 25% and 29%, than that reached with carbon fiber reinforcements. The modulus of elasticity of the test pieces reinforced with carbon fiber is higher by between 8% and 15% than that for the test pieces reinforced with basalt fibers. For the ultimate strain values, it can be concluded that higher values are achieved in the test pieces featuring basalt fibers, by between 9% and 28%, than those containing carbon fibers. Figure 5 shows a representation of the maximum strengths reached with the three types of reinforcement (Table 2) compared to the maximum force per unit of length that each type of reinforcement can offer (Table 1). Figure 4: Strength–strain graphs for pieces of wood subjected to compression testing. (**a**) Idealized graph, (**b**) Real graphs. It can be concluded that even though fabrics FC300 and FB600 have practically the same mechanical capacity, they result in very different breaking strengths in the reinforced elements. Consequently, it may be said that there is no relationship between the mechanical capacity of the reinforcement and the ultimate strength of the test piece tested. This conclusion is also reached when wooden elements undergoing an accelerated aging process are reinforced with fiberglass fabrics [65]. Reinforcement results in the lateral confinement of the wood fibers, preventing their displacement in a transverse direction. When a slip plane occurs in the wood, as in Figure 4a, the fabric comes apart, causing the piece to collapse. As such, the ultimate load of the piece is influenced more by local defects, such as knots in the wood, which cause it to break, than by the mechanical capacity of the reinforcement fabric. Figure 6 shows the breakage of the pieces of wood reinforced with each type of fabric and the slip plane created in the wood. Figure 5: Relationship between the maximum strengths reached and the mechanical capacity of the reinforcements. Figure 6: Breakage of reinforced pieces. (**a**) FC300, (**b**) FB280, and (**c**) FB600. The more rigid the reinforcement, the less transversal strain the section of the test piece will allow; this also translates into fewer longitudinal deformations and an increased modulus of elasticity. A virtually linear relationship was obtained (Figure 7) between the modulus of elasticity of the test piece and the rigidity of the reinforcement (R\({}^{2}\) = 0.986). The greater ultimate strains obtained with the FB280 reinforcements mean that, when ductility is measured as a function of the strains, the ductility obtained with this kind of reinforcement is somewhat higher than that for the other types. Greater reinforcement rigidity means that when the test piece reaches the maximum test load due to fiber slippage, the greater rigidity of the rest of the test piece that has not broken prevents the deformation of the whole. As such, the deformation is concentrated in the area of the breakage with the resulting decrease in the value of the ultimate strain of the test piece. A good linear relationship was obtained (Figure 8) between the ultimate strain and the reinforcement rigidity (R\({}^{2}\) = 0.868).