Freeze-thaw durability of repair mortars and porous limestone: compatibility issues

A. Török, Balázs Szemerey-Kiss

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Freeze-thaw cycles can cause considerable damage to porous materials and thus have an adverse effect on the durability of mortars and porous stone. 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. During the test, samples of stone and mortar were bonded together and the weight loss was continuously monitored. The adhesion bond between the stone and the mortar was also observed during the cycles. Petrographic analysis and thin sections were also made before and after the freeze-thaw test. The pore size distribution (mercury intrusion porosimetry, MIP) of mortars and stones was also measured. The test showed that most of the repair mortars were damage more than porous limestone due to frost action. Two exceptions are two commercial available repair mortars. 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. All other samples were broken during the frost tests; stone/mortar interface was dismounted. Other typical damage features such as delamination, blistering, powdering, and granular disintegration were also observed leading to the gradual surface loss of the material. Our tests proved that low pozzolanic cement content in mortars decreases the material durability. According to the pore size distribution (MIP), the small pores (around 0.1 μm) control the weathering behavior of tested porous materials. [Figure not available: see fulltext.].

Original languageEnglish
Article number42
JournalProgress in Earth and Planetary Science
Volume6
Issue number1
DOIs
Publication statusPublished - Dec 1 2019

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mortar
durability
repair
limestone
frost
freeze-thaw cycle
adhesion
damage
delamination
thin section
stone
test
cement
weathering

Keywords

  • Durability
  • Freeze-thaw
  • Limestone
  • Pore size distribution
  • Repair mortar

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Freeze-thaw durability of repair mortars and porous limestone : compatibility issues. / Török, A.; Szemerey-Kiss, Balázs.

In: Progress in Earth and Planetary Science, Vol. 6, No. 1, 42, 01.12.2019.

Research output: Contribution to journalArticle

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