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Results are reported in Figure 3 and are similar for the whole structure samples. The mix of salts on the samples is identified and Relative Humidity of equilibrium (RHeq) is reported for each salt in the solution. It is worth to mention that Cartagena stands in a tropical area, with a Relative Humidity range between 72 % to 90 % during the year, considering minimum and maximum values of daily and seasonal variations. From these preliminary studies, Thenardite and Bloedite could crystalize having a RHeq of 75 %, although their role on the material deterioration should be further studied, for example pondering whether the number of crystallization cycles per year is relevant.
Regarding mechanical properties, SUCS varies between 1.5 MPa to 2.2 MPa which is typical of a soft pure limestone (Table 3).
Conclusions
In the present research structure sample were analysed and the problem of salt crystallization in the structure deterioration was approached.
It was found that salts on the structure surface rarely crystalize due to high environmental RH in the area of study. Therefore, it can be inferred that probably salt plays a minor role in the stone deterioration, while the main causes of deterioration should be further studied.
129Quarry and structure stone were physical-chemical compared through X-ray and petrographical analysis. Quarry stones were found compatible for replacement of deteriorated block, although further research is needed to include more relevant physical and aesthetic variables in the analysis of stone replacement such as colour, texture and moisture transport properties.
Acknowledgements
This Project has been funded by the Universidad de Cartagena, Colombia, through the resolution number 00473 of 2016 “Octava convocatoria a proyectos de investigación, para grupos de investigación visibles (categorizados o reconocidos) en la plataforma Scienti del departamento de Ciencia, Tecnología e Innovación-Colciencias y avalados por la Universidad de Cartagena”. Furthermore, this project has been funded with the support of the European Commission (Grant agreement no. 2014-0873/001-001). This publication only reflects the view of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein - Elarch Program (project reference number: 552129-em-1-2014-1-it-era mundus-ema21). Finally, Authors would like to acknowledge the development of this work to Universidad Nacional de Colombia by funding DIB 34835.
References
Álvarez-Carrascal, J. L. (2018). Retrospectiva de la construcción del cordón amurallado de Cartagena de Indias, su presente y su futuro. Universidad de Granada.
ASTM C1721 – 15 Standard Guide for Petrographic Examination of Dimension Stone, (2015).
Baronio G, Binda L, Tedeschi C, Tiraboschi C (2003) Characterisation of the materials used in the construction of the Noto Cathedral. Construction and Building Materials 17:557-571 doi: 10.1016/j.conbuildmat.2003.08.007.
Binda, L., Baronio, G., Gavarini, C., De Benedictis, R. & Tringali, S., (1999) Investigation on Materials and Structures for the Reconstruction of the Partially Collapsed Cathedral of Noto (Sicily). In 6th Int. Conf. Structural Studies, Repairs and Maintenance of Historical Buildings, STREMAH 99, Dresden, Germany, pp. 323–332.
Binda L, Baronio G, Tedeschi C, Tiraboschi C (2003c) Experimental research for the choice of adequate materials for the reconstruction of the Cathedral of Noto. Construction and Building Materials 17:629-639. doi:10.1016/S0950-0618(03)00059-X.
Bionda, D. (2005). A graphical user interface to the ECOS thermodynamic model for the prediction of the behaviour of salt mixtures under changing climate conditions.
Cabrera, A., Martelo, R., Martinez, A., & Martinez, R. (1995). La Ruta De Los Hornos.
UNI EN 1936:2007 Natural stone test methods – Determination of real density and apparent density, and of total and open porosity, 1 (2007).
DIMAR. (2018). Boletín Meteomarino del caribe Colombiano. No. 68 Agosto 2018. https://issuu.com/dimarcolombia/docs/boletin201808
Dunham, R. J. (1962). Classification of carbonate rocks according to depositional texture. In W. E. Ham (Ed.), Classification of Carbonate Rocks. American Association of Petroleum Geologists Memoir (pp. 108–121).
Ferretti, D., & Bažant, Z. P. (2006). Stability of ancient masonry towers: Moisture diffusion, carbonation and size effect. Cement and Concrete Research, 36(7), 1379–1388. https://doi.org/10.1016/j.cemconres.2006.03.013
Ghafar Ahmad, A., & Abdul Rahman, H. F. (2010). Treatment of Salt Attack and Rising Damp in Heritage Buildings in Penang, Malaysia. Journal of Construction in Developing Countries, 15(1), 93–113.
Kameni, M., & Orosa, J. A. (2016). Building construction materials effect in tropical wet and cold climates : A case study of office buildings in Cameroon. Case Studies in Thermal Engineering, 7, 55–65. https://doi.org/10.1016/j.csite.2016.01.007
Nasraoui, M., Nowik, W., & Lubelli, B. (2009). A comparative study of hygroscopic moisture content, electrical conductivity and ion chromatography 130for salt assessment in plasters of historical buildings. Construction and Building Materials, 23(5), 1731–1735. https://doi.org/10.1016/j.conbuildmat.2008.09.029
Price, C. (2000). Runsalt. An expert chemical model for determining the environmental conditions needed to prevent salt damage in porous materials, European Commission Research Report No 11, (Protection and Conservation of European Cultural Heritage). Archetype Publications.
Saba, M., Hernandez-Romero, N., Quiñones-Bolaños, E., & Lizarazo-Marriaga, J. (2019). Petrographic of Limestone Cultural Heritage as the Basis of a Methodology to Rock Replacement and Masonry Assessment: Cartagena de Indias Case of Study. Case Studies in Construction Materials. https://doi.org/https://doi.org/10.1016/j.cscm.2019.e00281
UNESCO. (1984). Port, Fortresses and Group of Monuments, Cartagena.
UNESCO. (2017). List of World Heritage in Danger.
Zoghlami, K., Lopez-Arce, P., & Zornoza-Indart, A. (2016). Differential Stone Decay of the Spanish Tower Façade in Bizerte, Tunisia. J. of Materials in Civil Engineering 1–14. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001774.
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