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Effect of mixed-in crystallization inhibitor on resistance of lime-cement mortar against NaCI

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Author: Lubelli, B.A. · Nijland, T.G. · Hees, R.P.J. van · Hacquebord, A.
Type:article
Date:2010
Place: Delft
Institution: TNO Bouw en Ondergrond
Source:Construction and Building Materials, 24, 12, 2466-2472
Identifier: 403062
doi: DOI:10.1016/j.conbuildmat.2010.06.010
Keywords: Geosciences · Crystallization inhibitor · Mortar · Salt crystallization · Salt damage · Sodium chloride · Cement mortars · Cross section · Crystallization inhibitors · NaCl crystallization · On-resistance · Pilot studies · Porous building material · Salt crystallization · Salt crystals · Salt damage · Salt resistance · Scanning Electron Microscope · Specific crystal faces · Cements · Chemical compounds · Construction equipment · Lime · Mortar · Scanning electron microscopy · Sodium chloride · Crystallization

Abstract

Salt crystallization is a common cause of damage to porous building materials. Recent research has shown that some chemical compounds may inhibit salt crystallization or alter the mode of crystallization, thus limiting salt damage development, provided that the inhibitor was introduced prior to salt crystallization. In this paper, a pilot study is presented in which sodium ferrocyanide, a crystallization inhibitor for sodium chloride, has been mixed in a lime-cement mortar. Salt resistance of the mortar has been tested by means of a crystallization test. The results of the crystallization test show that the addition of the inhibitor significantly improves the salt resistance of the mortar. Scanning electron microscope observations carried out on the surface of the cross section of the specimens demonstrate that the inhibitor modifies the habit of the salt crystals, as well inhibits the development of specific crystal faces. © 2010 Elsevier Ltd. All rights reserved.