![]() ![]() Other typical damage features such as delamination, blistering, powdering, and granular disintegration were also observed leading to the gradual surface loss of the material. All other samples were broken during the frost tests stone/mortar interface was dismounted. These mortars were able to keep the adhesion with the stone, and the frost did not modify significantly the cubic shape of the test specimens, only rounding of the edges was observed. Two exceptions are two commercial available repair mortars. The test showed that most of the repair mortars were damage more than porous limestone due to frost action. The pore size distribution (mercury intrusion porosimetry, MIP) of mortars and stones was also measured. ![]() Petrographic analysis and thin sections were also made before and after the freeze-thaw test. The adhesion bond between the stone and the mortar was also observed during the cycles. During the test, samples of stone and mortar were bonded together and the weight loss was continuously monitored. To assess the behavior and frost resistance of two types of porous limestone, three commercially available repair mortars and four mixtures of laboratory-prepared repair mortars were subjected to freeze-thaw cycles according to EN 12371. Freeze-thaw cycles can cause considerable damage to porous materials and thus have an adverse effect on the durability of mortars and porous stone. ![]()
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