Chloride Ingress in Concrete Cracks under Cyclic Loading

André Küter, Mette Rica Geiker, John Forbes Olesen, Henrik Stang, Christoph Dauberschmidt, Michael Raupach

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Traditional approaches towards service life design and redesign of reinforced concrete are based on the assumption of a homogenous uncracked concrete. This assumption is questionable, as concrete always contains cracks and cracks affect the ingress rate of aggressive substances. Thus, there is increasing focus on the need for modeling the ingress of chloride into cracked concrete. Present models quantify chloride ingress in static cracks only, although several structural applications display dynamic loading conditions in an environment containing chlorides, e.g. marine structures and car parks. Preliminary investigations have been undertaken to quantify the effect of dynamic load application on the chloride ingress into concrete cracks. Specimens were designed allowing ingress of a chloride solution into a single crack of a saturated unreinforced mortar beam. One set of specimens was subjected to a load frequency of ten applications per minute and a second set to one application per hour simulating static cracks, however limiting the ingress hampering effects of autogenous healing and a possible dense precipitation on the crack faces. The averaged chloride exposure interval of the crack faces was similar for both sets and the maximum crack width was kept constant throughout the exposure period by means of precracking and an external prestressed reinforcement. Chloride profiles after 40 days revealed a considerable increase in ingress towards the crack tip in contrast to data from the literature covering ingress in static cracks.
Original languageEnglish
Title of host publicationConstruction Materials : Proceedings of ConMat'05 and Mindess Symposium
EditorsN. Banthia, T. Uomoto, A. Bentur, S.P. Shah
Place of PublicationVancouver, Canada
PublisherThe University of British Columbia
Publication date2005
Edition1.
ISBN (Print)0-88865-810-9
Publication statusPublished - 2005
Event3rd International Conference on Construction Materials: Performance, Innovations and Structural Implications - Vancoucer, Canada
Duration: 22 Aug 200524 Aug 2005
Conference number: 3
http://www.civil.ubc.ca/conmat05/

Conference

Conference3rd International Conference on Construction Materials
Number3
CountryCanada
CityVancoucer
Period22/08/200524/08/2005
Internet address

Fingerprint

Dive into the research topics of 'Chloride Ingress in Concrete Cracks under Cyclic Loading'. Together they form a unique fingerprint.

Cite this