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Tensile crack widhts of strain hardening cementbased composites



Title: Tensile crack widhts of strain hardening cementbased composites
Author(s): W.P. Boshoff and P.D. Nieuwoudt
Paper category : conference
Book title: 2nd International RILEM Conference on Strain Hardening Cementitious Composites (SHCC2-Rio)
Editor(s): R.D. Toledo Filho, F.A. Silva, E.A.B. Koenders and E.M.R. Fairbairn
ISBN: 978-2-35158-120-9
e-ISBN: 978-2-35158-121-6
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 199 - 206
Total Pages: 8
Nb references: 8
Language: English


Abstract: Strain Hardening Cement-based Composite (SHCC) is a type of High Performance Fibre Reinforced Cement-based Composite (HPFRCC). This cement-based composite contains randomly distributed, short polymeric fibres and exhibits superior strain hardening behaviour when subjected to a uni-axial tensile load. The resulting multiple cracks are normally less than 60 μm in width during the strain hardening phase. The formation of these fine cracks, compared to a relative large crack in conventional concrete, is key to improved durability of concrete structures. It has been shown that when crack widths are restricted to 100 μm, the permeability of concrete is significantly improved. It is however important to characterize the crack pattern objectively in order to link the degradation to the crack widths and/or patterns.
This paper presents the crack widths of SHCC under tensile loading based on a relative large set of specimens. A method is also proposed to characterise the proximity of the cracks using a parameter named Cracking Proximity Index.


Online publication: 2012-01-25
Publication type : full_text
Public price (Euros): 0.00