52. Prediction of lifetime of alkali-resistant glass fibres in cementitious concretes

Title: 52. Prediction of lifetime of alkali-resistant glass fibres in cementitious concretes
Author(s): H. Schorn, M. Schiekel
Paper category : conference
Book title: 6th International RILEM Symposium on Fibre Reinforced Concretes
Editor(s): M. di Prisco, R. Felicetti and G.A. Plizzari
Print-ISBN: 2-912143-51-9
e-ISBN: 2912143748
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 615 - 624
Total Pages: 10
Nb references: 9
Language: English

Abstract: Alkali resistant (AR)-glass fibres are produced not only for short fibre reinforcement but also for textile made two- or even three-dimensional reinforcement units. In all cases of use the durability of the fibres is affected by the high alkali environment in cementitious concrete as well as by the very complex crack bridging behaviour of the fibres which consist each of a large number of very thin filaments.
Using an Environmental Scanning Electron Microscope (ESEM) the results of damage processes are shown. A prediction method for the progress of damages has been developed.
Based on ESEM-observations an adhesive cross-linkage model has been created by the authors which allows a very well description of the complex bond behaviour of textile glass fibre reinforcement and concrete, and the prediction of the consequence of damages in bond behaviour due to corrosion processes.
In the adhesive cross-linkage model all filaments are bond to each other by a pattern of adhesive cross-links consisting of binder particles, e.g. hydration products of cement. The model allows generally a numerical prediction of either the stress distribution in all filaments of a fibre cross section as well as the typical successive cracking of single filaments due to increasing crack width.

Online publication: 2004-08-30
Publication type : full_text
Public price (Euros): 0.00