PSI - Issue 5

P.C. Raposo et al. / Procedia Structural Integrity 5 (2017) 1092–1096 Raposo et al. / Structural Integrity Procedia 00 (2017) 000 – 000

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2.2. Results The plaster plate from a partition wall of the case-study is showed in Fig. 2. The petrographic analysis performed for the plaster plate was made for three layers. The first layer petrographic analysis is presented in Fig. 3 and shows the form and dimensions of the minerals. In Figure 4 is showed petrographic results for the transition layer between the first and second layers. The main characteristics obtained in the petrographic analysis of the first layer of the plaster plate are presented in Table 1.

Fig. 2. Plaster plate from the partition wall (image from: [12]).

Fig. 3. Petrographic analysis of the 1 st layer for the plaster plate: (left) Results obtained from natural light; (right) Results obtained from polarized light (F – feldspars; M – micas; Q – quartz).

Fig. 4. Petrographic analysis of the transition layer between the 1 st and the 2 nd layers: (left) Results obtained from natural light; (right) Results obtained from polarized light (C1 – layer 1; C2 – layer 2).

Table 1. Petrographic characteristics of the 1 st sublayer of the plaster plate from the partition wall.

Dimensions (mm)

Layer/trace

Minerals

Observations

Quartz

0.3-2

1 st 1 part lime :1.5 parts sand [13]

Layer composed by lime and clay with micas, feldspars and quartz, fragments, and some calcite fragments.

Feldspars

0.3-3

Micas

0.1-1.5