NDLI: The design of an instrumented rebar for assessment of corrosion in cracked reinforced concrete

Content Provider	Springer Nature Link
Author	Pease, Brad Geiker, Mette Stang, Henrik Weiss, Jason
Copyright Year	2010
Abstract	An instrumented rebar is presented which was designed to have a realistic mechanical performance and to provide location dependent measurements to assess the environment with regards to reinforcement corrosion. The instrumented rebar was constructed from a hollowed 10 mm nominal diameter standard rebar with 17 electronically isolated corrosion sensors. Instrumented and standard rebars were cast into concrete beams and bending cracks were induced and held open using steel frames. Epoxy impregnation was used to assess and compare cracks in the concrete around the instrumented and standard rebar. As bending-induced cracks reached the reinforcement, slip and separation occurred along the concrete–reinforcement interface. Cracks in the concrete surrounding standard and instrumented rebars are largely similar in appearance; however, sensors protruding from the instrumented rebar reduced the separation between the steel and concrete. Cracked beams with cast-in instrumented and standard rebars were ponded with a 10% chloride solution and the open circuit corrosion potential (OCP) of the 17 sensors was measured for up to 62 days. Measurements from the individual sensors indicate when and where active corrosion may be thermodynamically favored based upon the local environmental conditions. Results indicated the length along the instrumented rebar where active corrosion was thermodynamically favored increased with exposure time due to the increased aggressivity of the local environmental conditions.
Starting Page	1259
Ending Page	1271
Page Count	13
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	44
Issue Number	7
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-12-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Reinforcement corrosion Instrumented rebar Cracked concrete Crack width Corrosion potential Civil Engineering Theoretical and Applied Mechanics Building Materials Materials Science Structural Mechanics Operating Procedures, Materials Treatment
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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