Abstract
Different binders consisting of natural hydraulic lime (NHL5) and metakaolin (MK) and, optionally, white cement (CEM) are examined in the present article. The aim is to produce a material, that will be used in restoration applications and it will be compatible with the original building materials. Thus, in order to assess the performance of these binders, an experimental protocol was implemented, including compression and bending tests. The results showed that metakaolin is an adequate pozzolanic addition for lime mortars, providing adequate mechanical characteristics for application in conservation mortars. The addition of metakaolin improved essentially the mechanical properties of the binder, while the addition of white cement at low concentrations, as a constituent of the binder, improved further, up to 60 %, the mechanical properties of the previously mentioned mortars.
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