Study on effective modifiers for damaging salts in mortar
bookPart
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
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
TNO Identifier
517619
Source title
Book of abstracts of the 1st Ageing of Materials and Structures 2014 Conference
Editor(s)
Breugel, K. van
Koenders, E.A.B.
Koenders, E.A.B.
Pages
199-200
Files
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