Rock Finishing and Response to Salt Fog Atmosphere

Abstract:

Seven silicate rocks used as ornamental stones and having different surface finishing were submitted to salt fog atmospheres in order to compare different susceptibilities to alteration. Polished, honed, hammered and flamed finishing types were tested. Rocks come from Portugal, Brazil and Angola and are widely commercialized. Samples covered quartz rich rocks, silica saturated and undersaturated rocks, mono and plurimineralic rocks, coarse and fine grained rocks. Mineral composition, texture and open porosity showed to be important parameters which determine mass loss among samples, but the finishing type was very effective within samples. Mass loss and porosity increase are higher on hammered samples, contrasted with the lowest loss values on polished samples. The effect of surface hydrophobicity and roughness on the samples having polished finishing was also analysed by atomic force microscopy (AFM) and water contact angle (WCA), indicating that texture and mineral diversity influence the hydrophobic character of the rock surfaces.

• Periodical: Key Engineering Materials (Volume 548)
• Pages: 275-286
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.548.275
• Online since: April 2013
• Authors: Zenaide Carvalho G. Silva, Joaquim Simão, Maria Helena Sá, Nuno Leal
• Keywords: Dimension Stone, Rock Finishing, Salt Fog Atmosphere, Weathering

References

[1] A. Konin, R. François, G. Arliguie: Penetration of chlorides in relation to the microcracking state into reinforced ordinary and high strength concrete, Materials and Structures 31(5) (1998) pp.310-316.

DOI: 10.1007/bf02480672

[2] Z.S.G. Silva, J.A.R. Simão: The role of salt fog on alteration of dimension stone, Construction and Building Materials 23(11) (2009) pp.3321-3327.

DOI: 10.1016/j.conbuildmat.2009.06.044

[3] M. Angeli, J. -P. Bigas, D. Benavente, B. Menéndez, R. Hébert, C. David: Salt crystallization in pores: quantification and estimation of damage, Environmental Geology 52 (2007) pp.205-213.

DOI: 10.1007/s00254-006-0474-z

[4] P. A. Maurice-Johnsson: Use of AFM in experimental surface geochemistry, Mineralogical Magazine 58A (1994) pp.575-576.

DOI: 10.1180/minmag.1994.58a.2.36

[5] P. Theoulakis, A. Moropoulou: Microstructural and mechanical parameters determining the susceptibility of porous building stones to salt decay, Construction and Building Materials 11(1) (1997) pp.65-71.

DOI: 10.1016/s0950-0618(96)00029-3

[6] D. Benavente, N. Cueto, J. Martínez-Martínez, M. A. García del Cura, J. C. Cañaveras: The influence of petrophysical properties on the salt weathering of porous building stones, Environmental Geology 52(2) (2007) pp.215-224.

DOI: 10.1007/s00254-006-0475-y

[7] G.R. Meira, C. Andrade, C. Alonso, I.J. Padaratz, J.C. Borba: Modelling sea-salt transport and deposition in marine atmosphere zone – A tool for corrosion studies, Corrosion Science 50(9) (2008) pp.2724-2731.

DOI: 10.1016/j.corsci.2008.06.028

[8] M. Urosevic, E. Sebastián-Pardo, C. Cardell: Rough and polished travertine building stone decay evaluated by a marine aerosol ageing test, Construction and Building Materials 24(8) (2010) pp.1438-1448.

DOI: 10.1016/j.conbuildmat.2010.01.011

[9] EN 13755: 2005 European standard - Natural stone test methods. Determination of water absorption at atmospheric pressure, European Committee for Standardization (CEN, Brussels).

[10] C. Anjinho, P.M. Amaral, Z.C.G. Silva: A transformação de rochas ornamentais – Acabamento e controlo de qualidade, Arquitectura e Vida, no. 80 (2007) pp.134-139.

[11] T.T. Chau: A review of techniques for measurement of contact angles and their applicability on mineral surfaces, Minerals Engineering 22(3) (2009) p.213–219.

DOI: 10.1016/j.mineng.2008.07.009

[12] E.A. Vogler: Structure and reactivity of water at biomaterial surfaces, Advances in Colloid and Interface Science 74(1-3) (1998) pp.69-117.

DOI: 10.1016/s0001-8686(97)00040-7

[13] G. Binnig, H. Rohrer, Ch. Gerber, E. Weibel: Tunneling through a controllable vacuum gap, Applied Physics Letters 40(2) (1982) p.178–180.

DOI: 10.1063/1.92999

[14] J. Verran, D.L. Rowe, D. Cole, R.D. Boyd: The use of the atomic force microscope to visualise and measure wear of food contact surfaces, International Biodeterioration & Biodegradation 46(2) (2000) pp.99-105.

DOI: 10.1016/s0964-8305(00)00070-6

[15] K.C. Khulbe, C.Y. Feng, T. Matsuura: Synthetic Polymeric Membranes – Characterization by Atomic Force Microscopy (Springer, Berlin, Germany, 2008).

[16] Z.S.G. Silva, J.A.R. Simão: Syenite as ornamental stone – Quality and alteration, in Proceedings of the 8th IAEG Congress, Vancouver, Moore & Hungr (eds. ), Balkema (1998) pp.2897-2901.

[17] A. Arnold, A. Kueng: Crystallization and habits of salt efflorescences on walls – Part I. Methods of investigation and and habits, in Proceedings of the 5th International Congress on the Deterioration and Conservation of Stone, ed. G. Félix, Presses Polytechniques Romandes, Lausanne (1985).

[18] A. Arnold, K. Zehnder: Crystallization and habits of salt efflorescences on walls – Part II. Conditions of crystallization. in Proceedings of the 5th International Congress on the Deterioration and Conservation of Stone, ed. G. Félix, Presses Polytechniques Romandes, Lausanne (1985).