Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Water Permeability and Capillary Absorption of Cracked SHCC
Abstract Water transport through cracked Strain-Hardening Cement-Based Composites (SHCC) is possible by pressure gradient driven water permeation or by capillary absorption. The crack pattern in the SHCC, normally characterized by numerous fine cracks, affects the associated transport rates in different ways. Whereas the water permeability is mainly influenced by the crack density and by the crack width distribution, capillary absorption also depends on the crack spacing distribution. Experimental results concerning both transport mechanisms are presented. Water permeability tests of SHCC specimens pre-cracked under uniaxial tension were conducted and the capillary absorption of uncracked, cracked, as well as fractured SHCC surfaces was measured. Methods for linking the corresponding transport rates to certain crack pattern parameters are proposed. In the case of water permeability, a weighting function for the crack width has been derived on the basis of the Hagen-Poiseuille equation. For modelling capillary absorption, the transported water volume has been subdivided into the one filling the cracks, the one absorbed by the outer surface, and the one absorbed by the crack faces. Based on experimental observations, it is assumed that existing cracks become almost instantly water-filled when the cracked surface is exposed to liquid water.
Water Permeability and Capillary Absorption of Cracked SHCC
Abstract Water transport through cracked Strain-Hardening Cement-Based Composites (SHCC) is possible by pressure gradient driven water permeation or by capillary absorption. The crack pattern in the SHCC, normally characterized by numerous fine cracks, affects the associated transport rates in different ways. Whereas the water permeability is mainly influenced by the crack density and by the crack width distribution, capillary absorption also depends on the crack spacing distribution. Experimental results concerning both transport mechanisms are presented. Water permeability tests of SHCC specimens pre-cracked under uniaxial tension were conducted and the capillary absorption of uncracked, cracked, as well as fractured SHCC surfaces was measured. Methods for linking the corresponding transport rates to certain crack pattern parameters are proposed. In the case of water permeability, a weighting function for the crack width has been derived on the basis of the Hagen-Poiseuille equation. For modelling capillary absorption, the transported water volume has been subdivided into the one filling the cracks, the one absorbed by the outer surface, and the one absorbed by the crack faces. Based on experimental observations, it is assumed that existing cracks become almost instantly water-filled when the cracked surface is exposed to liquid water.
Water Permeability and Capillary Absorption of Cracked SHCC
Wagner, Christian (Autor:in) / Villmann, Beate (Autor:in) / Slowik, Volker (Autor:in)
05.09.2017
9 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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