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 language | English |
---|---|
Title of host publication | Construction Materials : Proceedings of ConMat'05 and Mindess Symposium |
Editors | N. Banthia, T. Uomoto, A. Bentur, S.P. Shah |
Place of Publication | Vancouver, Canada |
Publisher | The University of British Columbia |
Publication date | 2005 |
Edition | 1. |
ISBN (Print) | 0-88865-810-9 |
Publication status | Published - 2005 |
Event | 3rd International Conference on Construction Materials: Performance, Innovations and Structural Implications - Vancoucer, Canada Duration: 22 Aug 2005 → 24 Aug 2005 Conference number: 3 http://www.civil.ubc.ca/conmat05/ |
Conference
Conference | 3rd International Conference on Construction Materials |
---|---|
Number | 3 |
Country/Territory | Canada |
City | Vancoucer |
Period | 22/08/2005 → 24/08/2005 |
Internet address |