PSI - Issue 11

J.H.A. Rocha et al. / Procedia Structural Integrity 11 (2018) 99–106 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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3.2. Pathological manifestations

A bar graph was prepared showing temperatures of the area affected by humidity ("SP2") at 3 and 4 meters (Fig. 6), in order to observe data distribution on test day.

Fig. 6. Measurements performed in the building.

When analyzing Fig- 6 graph, no significant difference in measurements made at 3 meters and 4 meters was observed. Only the latter measurement was used to get a greater coverage of thermal image in relation to the subject wall. Temperatures ("SP2") increase more or less gradually, considering the highest values taken around 2:00 PM (green arrow), and falling again at the end of the afternoon (yellow arrow). With the aim of verifying what Barrera and Freitas (2007) affirmed about the need to have a minimum temperature difference of 1 °C between the environment and the object studied, in order to make the use of thermography feasible, Fig. 7 graph, where this difference is represented by "d" and the object by "SP2", was prepared.

Fig. 7. Difference between ambient temperature and moist area.

Both early in the morning and at the end of the afternoon, the almost-balance status found in the moist area ("SP2") and the environment is perceptible. Gradually, that difference grows reaching the peak value around noon. It is possible to corroborate this information through a visual analysis of thermograms captured at 8:00 AM, noon and 5:00