Tribometer friction tests on cracked brick-mortar interfaces
Rita Esposito (TU Delft - Civil Engineering & Geosciences)
Karthick Sasikumar (Student TU Delft)
Alessandro Cabboi (TU Delft - Civil Engineering & Geosciences)
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Abstract
Friction significantly affects masonry, especially in determining lateral resistance. This study evaluates the contribution of friction in cracked masonry by performing reciprocating sliding tests on cracked brick-mortar interfaces, by means of a tribometer, whose application to masonry materials remains unexplored. Enabling the evaluation of the sole contribution of the friction mechanism at the cracked brick-mortar interface is rather novel for the field of mortared masonry, in which friction properties are typically calculated through an inverse analysis of experiments involving both de-cohesion and friction mechanism. A solid clay brick masonry with cement-lime mortar is considered as case study. The influence of various parameters is studied, such as the normal force and the sliding frequency. The preliminary study shows a large variability in terms of the kinetic coefficient of friction and tangential stiffness. This may suggest that the roughness and waviness of the cracked interface - and consequently, wear and debris formation - highly influence the overall friction response.
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