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Study on effective modifiers for damaging salts in mortar

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Author: Granneman, S.J.C. · Ruiz-Agado, E. · Lubelli, B.A. · Hees, R.P.J. van · Rodriguez-Navarro, C.
Type:bookPart
Date:2014
Source:Breugel, K. vanKoenders, E.A.B., Book of abstracts of the 1st Ageing of Materials and Structures 2014 Conference, 199-200
Identifier: 517619
Keywords: Architecture · Buildings and Infrastructure · Built Environment · Building Engineering & Civil Engineering · SR - Structural Reliability · TS - Technical Sciences

Abstract

Ageing of porous building materials due to the crystallization of soluble salts is a well-known problem, which is expected to increase in the near future due to climate changes. Salt crystallization inside the pores can generate pressures which eventually lead to damage. Lime mortars used in restoration are, due do their limited mechanical strength and their unfavourable, bimodal pore size distribution, among the building materials most affected by salt damage. Existing solutions to improve the mortar durability with respect to salt crystallization include the replacement of the lime binder with cement for increasing the mechanical strength, or the use of water repellent mixed in the mass for inhibiting the moisture transport and thus salt accumulation in the mortar. However, both these solutions have a low compatibility with the existing fabric