Environmental Geology

, Volume 56, Issue 3–4, pp 729–740 | Cite as

Laboratory simulation showing the influence of salt efflorescence on the weathering of composite building materials

Special Issue

Abstract

A common decay scenario in old and new buildings was simulated: the effects on masonry structures of salt efflorescence or subefflorescence produced by the rise of saline solution. Eight different types of masonry wall each made up of a combination of different construction materials (brick, calcarenite and four types of mortar were combined as follows: pure lime mortar, mortar + air entraining agent, mortar + pozzolana, mortar + air entraining agent + pozzolana) have been tested. These materials have different textures (strong anisotropy in brick, irregular-shaped pores in calcarenite, retraction fissures or rounded pores in mortars which also show a reduction of porosity along the contact area with the stone), different hydric behaviours (under total immersion brick + mortar specimens absorb water faster than calcarenite + mortar specimens) and different pore size distribution (brick shows unimodal pore distribution, whereas calcarenite and mortars are bimodal). In the salt weathering test, mortars interlayered with masonry blocks did not act as sacrificial layers. In fact, they allowed salts to rise through them and crystallize on the brick or calcarenite pieces causing the masonry structure to decay. Only the addition of an air-entraining agent partially hindered the capillary rise of the salt-laden solutions.

Keywords

Masonry walls Efflorescence and subefflorescence Porosity Weathering 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Mineralogy and PetrologyUniversity of GranadaGranadaSpain

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