Advertisement

The influence of hydrophobic protection on building exterior claddings

  • Carlos Esteves
  • Hawreen Ahmed
  • Inês Flores-ColenEmail author
  • Rosário Veiga
Article
  • 12 Downloads

Abstract

This study presents the results of an experimental campaign with the aim of investigating the hydrophobic protection of three substrates (stone, render, and external thermal insulation composite system—ETICS) with the application of three hydrophobic products: silicon and titanium dioxides-based nanostructured dispersion (HNST); a silane/oligomeric siloxane (HSila/Silox); and a siloxane (HSilox). To determine the effectiveness of the hydrophobic treatments, specimens of the untreated and treated wall coatings were characterized with different laboratory tests. The results showed that all products introduced significant improvements in the hydric properties of the substrates, leading to lower capillary water absorption (98%), water permeability with Karsten pipes (99%), drying index (39%), and higher water repellency assessed through the contact angle (283%). The application of hydrophobic materials also had a negative effect, leading to up to a 227% increase in resistance to water vapor diffusion. Among the assessed wall coatings, the rendering mortar appears to have the best initial performance after the application of all the types of hydrophobic materials tested. In general, the hydrophobic product HSilox was proved to be the most suitable for rendering mortars, while HNST was more appropriate for stone substrates.

Keywords

Rendering mortars External thermal insulation composite system Stone Silicon-based hydrophobic product Superficial protection 

Notes

Acknowledgments

Acknowledgments to CERIS research unit from IST, REuSE project from LNEC, refª 0803/112/19461, and WGB Shield project from FCT, refª PTDC/ECI-EGC/30681/2017. The authors wish to thank Dr. Dória Costa, Dr. Lina Nunes from National Laboratory for Civil Engineering (LNEC) for performing the contact angle and biological colonization tests, respectively, and Eng. Sofia Malanho and the technicians for their support in the experimental work from LNEC. The authors acknowledge Weber, NanoPhos, and CIN manufacturers for the hydrophobic products.

References

  1. 1.
    Li, Y, Ren, S, Building Decorative Materials, Architectural Coatings. In: Woodhead publishing series in civil and structural engineering (2011)Google Scholar
  2. 2.
    Pukhkal, V, “Humidity conditions for exterior walls insulation (case study of residential housing development in Saint-Petersburg).” In: Procedia Engineering, International scientific Conference Urban Civil Engineering and Municipal Facilities, 2015Google Scholar
  3. 3.
    Jerman, M, Černý, R, “Effect of Moisture Content on Heat and Moisture Transport and Storage Properties of Thermal Insulation Materials.” Energ Buildings, 53 39–46 (2012)Google Scholar
  4. 4.
    Pavlík, Z, Žumár, J, Medved, I, Černý, R, “Water Vapor Adsorption in Porous Building Materials: Experimental Measurement and Theoretical Analysis.” Transport Porous Med., 91 (3) 939–954 (2012)CrossRefGoogle Scholar
  5. 5.
    Duarte, R, Flores-Colen, I, de Brito, J, “In situ testing techniques for in-service evaluation of water penetration in rendered façades-the portable moisture meter and Karsten tube.” In: 12th DBMC International Conference on Durability of Building Materials and Components, Porto, Portugal, 2011.Google Scholar
  6. 6.
    Lepech, M, Li, V, “Water permeability of engineered cementitious composites.” Cement Concrete Comp., 31 (10) 744–753 (2009)CrossRefGoogle Scholar
  7. 7.
    Roos, M, Konig, F, Stadtmuller, S, Weyershausen, B, “Evolution of silicone based water repellents for modern building protection.” Hydrophobe V. In: 5th International Conference on Water Repellent Treatment of Building Materials. Aedificatio Publishers, Brussels, Belgium, 2008Google Scholar
  8. 8.
    Sacchi, B, Malesci, I, Rosi, L, Fresiani, M, Giuntoli, G, Pedna, A, Fresiani, P, Deterioration and Protection of Historic and Artistic Stones: The Role of Synthetic Polymers. In: Cultural Heritage: Protection, Developments and International Perspectives. Nova Publisher (2013)Google Scholar
  9. 9.
    Othman, NL, Jaafar, M, Harun, WM, Ibrahim, F, “A Case Study on Moisture Problems and Building Defects.” Procedia Soc. Behav. Sci., 170 27–36 (2015)CrossRefGoogle Scholar
  10. 10.
    Silva, L, Flores-Colen, I, Vieira, N, Timmons, AB “Natural ageing tests to study in-service water resistance of pre-mixed one-coat rendered walls with hydrophobic agents.” In: International Conference on Durability of Building Materials and Components, Porto, Portugal, 2011Google Scholar
  11. 11.
    Vries, J, Polder, R, “Hydrophobic Treatment of Concrete.” Constr. Build. Mater., 11 (4) 259–265 (1997)CrossRefGoogle Scholar
  12. 12.
    Selley, D, “Chemical Considerations for Making Low-VOC Silicon-Based Water Repellents.” J. Coat. Technol. Res., 7 (1) 26–35 (2010)Google Scholar
  13. 13.
    Correia, J, Baltazar, L, Rodrigues, M, “Hydrophobic Protection for Concrete: Short-Term Performance and Durability.” J. Restor. Build. Monum., 19 (4) 267–278 (2012)Google Scholar
  14. 14.
    Pinto, A, “Conservation of granite stone. Study of water repellent action (in Portuguese).” ITG 22, LNEC, Lisboa 193p. (1997)Google Scholar
  15. 15.
    Finzel, W, Vincent, H, “Silicones in Coatings.” Federation Series on Coatings Technology, Philadelphia (1996)Google Scholar
  16. 16.
    Edwards, P, “Preservation for the Future: The Need for Waterproofing Structures Above and Below Ground.” J. Protect. Coat. Linings, 7 (12) 42–46 (2002)Google Scholar
  17. 17.
    Couto, S, “Utilização de hidrófugos de superfície em materiais cerâmicos. Influência na secagem.” Master dissertation, Instituto Superior de Engenharia Civil de Lisboa (2010)Google Scholar
  18. 18.
    BSEN1015-18 (2002) Methods of test for mortar for masonry. Determination of water absorption coefficient due to capillary action of hardened mortarGoogle Scholar
  19. 19.
    ETAG004 (2013) Guideline for European technical approval of external thermal insulation composite systems (ETICS) with renderingGoogle Scholar
  20. 20.
    RILEMTC25-PEM (1980) Evaporation curve, Test No II. 5, Recommandations provisoiresGoogle Scholar
  21. 21.
    RILEMTC25-PEM (1980) Water absorption under low pressure, Pipe method, Test No II. 4, Recommandations provisoiresGoogle Scholar
  22. 22.
    BSEN1015-19 (1999) Methods of test for mortar for masonry. Determination of water vapour permeability of hardened rendering and plastering mortarsGoogle Scholar
  23. 23.
    ASTMD5590 (2010) Standard test method for determining the resistance of paint films and related coatings to fungal defacement by accelerated four-weekGoogle Scholar
  24. 24.
    BSEN15802 (2009) Conservation of cultural property. Test methods. Determination of static contact angleGoogle Scholar
  25. 25.
    Carver, SJ, “Integrating Multi-criteria Evaluation with Geographical Information Systems.” IJGIS, 5 (3) 321–339 (1991)Google Scholar
  26. 26.
    Jankowski, P, “Integrating Geographical Information Systems and Multiple Criteria Decision-Making Methods.” IJGIS, 9 (3) 251–273 (1995)Google Scholar

Copyright information

© American Coatings Association 2019

Authors and Affiliations

  1. 1.CERIS, DECivil, Instituto Superior Técnico, Universidade de LisboaLisbonPortugal
  2. 2.Laboratório Nacional de Engenharia CivilLisbonPortugal

Personalised recommendations