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

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• 作者：Balázs Szemerey-Kiss ; Ákos Török
• 关键词：Repair mortar ; Limestone ; Pre ; treatment ; Binder/aggregate ratio ; Adhesion strength ; Compatibility
• 刊名：Bulletin of Engineering Geology and the Environment
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：76
• 期：1
• 页码：159-167
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Geoengineering, Foundations, Hydraulics; Geoecology/Natural Processes; Nature Conservation;
• 出版者：Springer Berlin Heidelberg
• ISSN：1435-9537
• 卷排序：76

文摘

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.