The microstructural evolution of cementitious, flexible waterproofing membranes during deformation with special focus on the role of crazing

Waldvogel, Marius; Zurbriggen, Roger; Berger, Alfons; Herwegh, Marco (2020). The microstructural evolution of cementitious, flexible waterproofing membranes during deformation with special focus on the role of crazing. Cement & concrete composites, 107, p. 103494. Elsevier 10.1016/j.cemconcomp.2019.103494

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The initiation and evolution of deformation-induced (micro)structures in one-component, cementitious, flexible waterproofing membranes is investigated combining normed crack bridging (EN14891) with image analysis of in-situ photos acquired by optical and scanning electron microscopy. The permanent deformation of the polymer matrix concentrates in a trapezoidal deformation volume and subdivides into an active and a passive part. During the active part, the polymer matrix stretches and fibril-void microstructures (FVM) form. The ubiquitously present heterogeneities (quartz grains, cement particles and air pores) act as stress concentrators. After FVMs reach their maximum density inside the deformation volume, straining by passive stretching until final rupturing takes over. Starting at the substrate-membrane interface, the cracking propagates through the membrane along aforementioned heterogeneities and the spatially distributed FVMs. Linking mechanical behaviour and deformation structures is therefore crucial to (i) understand the complex elasto-plastic deformation and to (ii) develop new products increasing the durability of the protective system.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Waldvogel, Marius Alexander; Berger, Alfons and Herwegh, Marco

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0958-9465

Publisher:

Elsevier

Language:

English

Submitter:

Marco Herwegh

Date Deposited:

30 Jan 2020 11:12

Last Modified:

14 May 2020 10:28

Publisher DOI:

10.1016/j.cemconcomp.2019.103494

BORIS DOI:

10.7892/boris.139631

URI:

https://boris.unibe.ch/id/eprint/139631

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