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*Source: Materials Resistance Laboratory, Universidad Nacional de Colombia at Manizales.

*Source: Materials Resistance Laboratory, Universidad Nacional de Colombia at Manizales.

Figure 7. SEM/EDX micrograph (162x) of the organic portion of the surface of the construction work. Source: Plasma Physics Laboratory, Universidad Nacional de Colombia at Manizales, Colombia.

Other physical analyses carried out permitted concluding that the bricks on the bridge have high porosity (39.4-40.4%), which could not always be a characteristic of the original sample, but could be related to natural physical wear and to the environmental conditions.

3.2 SEM analysis

Scanning Electron Microscopy (SEM) micrographs with 162x magnifications (Fig. 7) applied over surface planes of the bricks reveal hyphae and the formation of mycelium of the fungus that has grown due to long-term environmental exposure. The porosity of the bricks facilitates the presence of these organisms.

Visual inspection permits deducing that the most affected areas are found on the borders of the structure and are probably caused by the incompatibility of the mortar joints with the bricks, along with the water percolation effect for many years.

Simultaneously, SEM analysis techniques were applied on samples extracted from an inner portion

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