Print Email Facebook Twitter Effect of mixed in crystallization modifiers on the resistance of lime mortar against NaCl and Na2SO4 crystallization Title Effect of mixed in crystallization modifiers on the resistance of lime mortar against NaCl and Na2SO4 crystallization Author Granneman, S.J.C. (TU Delft Heritage & Technology) Lubelli, B. (TU Delft Heritage & Technology) van Hees, R.P.J. (TU Delft Heritage & Technology; TNO) Date 2019 Abstract Weathering of porous building materials caused by the crystallization of soluble salts is a ubiquitous problem in the built cultural heritage. Especially lime-based mortars are susceptible to salt decay, due to both their bimodal pore size distribution and low mechanical strength. The addition of crystallization modifiers to mortars during mixing may confer them an improved resistance to salt decay. In this research, lime-based mortars additivated with ferrocyanide or borax (modifiers for sodium chloride and sodium sulfate, respectively) were prepared. An accelerated salt crystallization test was carried out to assess the effect of the modifiers on the salt resistance of the mortars. The development of damage was assessed by visual and photographical observations and by quantifying the salt and material loss. At the end of the test, SEM observations were performed on the surface and cross-section of the specimens, to study the effect of the modifiers on the crystallization habit of the salts. The ferrocyanide and borax additivated mortars showed a considerably improved durability with respect to salt crystallization damage. Both modifiers altered the growth morphology of the salt crystals inside the pores of the mortars. Subject Crystallization modifiersLime mortarSalt crystallizationSalt damageSodium chlorideSodium sulfate To reference this document use: http://resolver.tudelft.nl/uuid:5606a890-5bdd-43e6-8577-e0312c39d8dd DOI https://doi.org/10.1016/j.conbuildmat.2018.11.006 Embargo date 2020-11-08 ISSN 0950-0618 Source Construction and Building Materials, 194, 62-70 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 S.J.C. Granneman, B. Lubelli, R.P.J. van Hees Files PDF Granneman_et_al_CBM_2019_ ... ersion.pdf 3.56 MB Close viewer /islandora/object/uuid:5606a890-5bdd-43e6-8577-e0312c39d8dd/datastream/OBJ/view