Bestimmung der Druckfestigkeit von vorhandenem Mauerwerk.

Determining the compressive strength of existing brickwork The compressive strength of brickwork depends on the compressive strength of the bricks, the compressive strength of the hardened mortar and on the bond strength between mortar and units. In the case of existing masonry, the available amount of samples is limited, due to the concept of minimum intervention at cultural heritage or economic reasons. A particular difficulty lies in the subsequent determination of the mortar compressive strength and the bond properties. Therefore, the masonry compressive strength is determined by core samples that contain both stone and joint parts. The presented Berger method has been utilized since the 1990s and is based on the comparison of the splitting tensile strength of a joint core and the bricks. This report is the revised German version of a publication at the international conference 17th IB2MaC, 2020 and a contribution to the current discussion about recommended methods for the subsequent determination of the masonry compressive strength. [ABSTRACT FROM AUTHOR]