Evidences for Strain Localisation on Surfaces of Waterproofing Membranes - A link between Structures and Mechanics

Waldvogel, Marius Alexander; Zurbriggen, Roger; Berger, Alfons; Herwegh, Marco (2018). Evidences for Strain Localisation on Surfaces of Waterproofing Membranes - A link between Structures and Mechanics. In: 20. Internationale Baustofftagung ibausil (pp. 2-17). F.A. Finger-Institut für Baustoffkunde

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Polymer-modified mortars are commonly used as waterproofing membranes to prevent crack propagation between a substrate and a tiling. In this study, a cementitious mortar modified with redispersible polymer powder is investigated in two crack bridging testing series. Testing the influence of the polymer content on load-displacement behaviour, reveals a positive correlation between the displacement the membrane can bridge and increasing polymer content. Contrarily, the maximum load only increases with polymer content until the polymer is the volumetrically dominant phase in the membrane. Above this threshold, the maximum load remains constant despite increasing polymer content. The second experimental series investigates the evolution of the strain localisation behaviour on the surface of the waterproofing membrane for a formulation with constant polymer content and relates it to the load-displacement behaviour. Strain localisation starts to appear as dispersed spots on the surface and correlates to a strain hardening behaviour. With increasing deformation, the incipient strain localisation spots grow, interconnect and eventually forming a continuous zone, in which further strain is accumulated. The mechanical evolution of this continuous zone can be correlated to the change from strain hardening to strain softening process of the membrane.

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