Durability and bonding of FRP system on masonry is crucial, especially for possible application in historical context.
If you are using FRP fibres in repair mortar - Try a pull out test or pull off test. You can core the cover concrete to the level of your FRP (not sure if you are using a fibres, rebar or mesh) and do a pull off test. This will give you an indication of the bond strength between the repair layer and masonry.
Durability test is not necessary unless the masonry has elements that can attack Fibres. If moisture is an issue modify the repair material accordingly or let the masonry surface dry out before application of repair mortar. If either is not possible study the de-bonding in moist condition and if you are satisfied with the results proceed.
Dear Amir,
In case, you are still interested in this question I can add the following to the mentioned comments from Sreejith.
You could possibly perform some hygrothermal or water immersion tests. Moist environment can be always critical in bonded elements. Temperature cycles can also cause interfacial damage due to thermal incompatibility between your substrate and the FRP. Salt crystallization effects on the interfacial bond can also be of interest as it is a common phenomenon in masonry structures.
You may like to take a look at some of my publications in my page (I have done some water immersion and hygrothermal tests) and please do not hesitate to contact me if you are seeking additional information.
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