Evaluation of crack patterns in SHCC with respect to water permeability and capillary suction

Author(s): C. Wagner, A. Dollase, V. Slowik
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 351- 352
Total Pages: 2
Language: English

Abstract: 
Strain-Hardening Cement-Based Composites (SHCC) are characterized by a high strain capacity of up to 5%. This behavior may be attributed to the formation of numerous closely spaced cracks with comparatively small widths. When SHCC is used for crack-bridging repair layers on concrete surfaces, the durability of the respective repair layer will depend on its water permeability and the latter is strongly influenced by the crack pattern in the SHCC. The present study deals with the characterization of crack patterns which are characteristic for SHCC. An evaluation method is proposed which considers both the crack density and the crack width distribution. The latter may be presented as so-called Crack Width Polygon (CWP) the format of which resembles the one of grain size distribution curves. For the comparison of different crack patterns by a single numerical value which is based on the CWP, the socalled Cumulated Crack Width Value (CCV) is proposed. The results of the crack pattern evaluation are compared to those of permeability and capillary suction measurements at cracked SHCC specimens. The objective of the presented work is to estimate the durability of cracked SHCC repair layers on the basis of observed crack patterns.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00