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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4. Conclusions Petrographic analysis permits to do a qualitative study of the binder/minerals volumetric plot and the quantify the minerals and voids/hollows size. For partition walls, the more interior layers have more aggregates quantity and this aggregates are more coarser [12, 13]. The exterior layers are composed with higher binder ratios and finer aggregates [14]. According to the study of Leitão [13] the trace, of interior mortar layers from the partition walls, (binder : aggregate) is of 1:3 or 1:1:4 (aerial lime paste : gypsum : limestone powder) and exterior layers are composed with finer aggregates and higher binder ratios (1 part aggregate : 1.2 or 7 parts of binder) [14]. Plaster plate of the studied partition walls are composed by three layers. The most interior layer made with a coarse lime and clay mortar with granitic sands. The middle layer has a large quantity of binder, porosity and cracking, being the differences between this layer and the first layer. The finish layer is composed by three sublayers and made with lime and sand, with tracks of gypsum and iron oxide. This study is important to identify the mineral composition and porosity of the mortars, with aims to make an adequate rehabilitation, without the use of aggressive mortars to the masonry and wood partition walls, e.g., and to preserve the mortars, if the mortars are susceptible to water and humidity. The petrographic analysis allow to deduce the origins from the minerals present in the mortars.

Acknowledgements

The authors express their appreciation to the proprietary of the case study building, Mr. Antero de Sousa, for the permanent availability during this study and to Mr. Tito João Ribeiro de Azevedo for producing the plaster specimen sheets for the petrographic analysis.

References

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