The microstructural evolution of cementitious, flexible waterproofing membranes during deformation with special focus on the role of crazing
作者： Marius Waldvogel , Roger Zurbriggen , Alfons Berger , Marco Herwegh , None
DOI: 10.1016/J.CEMCONCOMP.2019.103494
关键词:
摘要: Abstract 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 in-situ photos acquired by optical scanning electron microscopy. permanent deformation the polymer matrix concentrates a trapezoidal volume subdivides into an active passive part. During part, stretches fibril-void microstructures (FVM) form. ubiquitously present heterogeneities (quartz grains, cement particles air pores) act as stress concentrators. After FVMs reach their maximum density inside volume, straining stretching until final rupturing takes over. Starting at substrate-membrane interface, cracking propagates through membrane along aforementioned spatially distributed FVMs. Linking mechanical behaviour structures therefore crucial to (i) understand complex elasto-plastic (ii) develop new products increasing durability protective system.
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