Investigations on bonding behaviour of the reinforcements in historic masonry

Title: Investigations on bonding behaviour of the reinforcements in historic masonry
Author(s): M. Raupach, J. Brockmann, A. Domink, M. Schürholz
Paper category : conference
Book title: International Symposium on Connections between Steel and Concrete
Editor(s): R. Eligehausen
Print-ISBN: 2-912143-25-X
e-ISBN: 2351580346
Publisher: RILEM Publications SARL
Publication year: 2001
Pages: 443 - 455
Total Pages: 13
Nb references: 9
Language: English

Abstract: The masonry of historic buildings usually has been built in several layers. Damage often results from the fact that the masonry structure is no longer able to absorb the shear stress and transverse tensile stress which occurs in the masonry. In such cases, tie reinforcement can be installed as a repair measure in conjunction with mortar injection.
As tie reinforcement involves interfering with the historic structure in an irreversible manner, bond testing has been carried out by means of pull-out tests on two types of bond specimens (tie anchor/injection material and tie anchor/injection material/natural stone), with the aim of minimising interference with the historic structure by selecting the smallest possible drill hole diameter. A mortar which is compatible with the surrounding material in many historic buildings was used for the experiments. The tie anchors took the form of threaded rods with and without screwed-on nuts and ribbed steel reinforcing rods (in each case in stainless steel).
Greywacke, Obernkirchen sandstone and Weibern tuff were employed for the pull-out tests with natural stone specimens.
The test results show that the type of stone can have a substantial influence on the properties of the injection mortar and thus on the quality of the bond between the tie anchor and the mortar. It is also evident that a reduction in the customary drill hole diameter and subsequent reduced interference with the existing building structure is possible under certain conditions.

Online publication: 2009-12-31
Publication type : full_text
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