Failure mechanisms of repair mortar stone interface assessed by pull-off strength tests

Balázs Szemerey-Kiss, A. Török

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Adhesion strength between porous limestone and 8 repair mortars (4 commercial and 4 laboratory mixture) was tested. The composition of repair mortars was modified by adding aggregates, resulting in 1:3 and 1:5 binder/aggregate ratio. The limestone surface was either pre-treated (wetted) or dry. The pull-off strength was measured by using standard technique. The failure mechanism was also recorded. Three main failure types were identified depending on the location of the disintegration surface. The stone/mortar interface with pre-treatment had higher pull-off strength than the non pre-treated one. All mortars with higher aggregate content (1:5 binder aggregate ratio) showed lower adhesion strength, than the ones with lower aggregate content. The requirements for pull-off adhesion of concrete repair and historic stone repair are different, since for concrete strong bonding is required, while for stone failure at stone/mortar interface or within the repair mortar is a requisite.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalBulletin of Engineering Geology and the Environment
Volume76
Issue number1
DOIs
Publication statusPublished - Feb 1 2017

Keywords

  • Adhesion strength
  • Binder/aggregate ratio
  • Compatibility
  • Limestone
  • Pre-treatment
  • Repair mortar

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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