Damage indication by electrical resistivity measurement of carbon short fiber reinforced concrete in fatigue testing

Philipp Lauff, Oliver Fischer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The newly developed material carbon short fiber reinforced concrete (CSFRC) was investigated extensively in the last years. This material combines high tensile strength of the carbon fibers with ultra-high compression strength of concrete. The focus lies on orienting the fibers in order to gain the most possible tensile enhancement. This is achieved by admixing the carbon fibers in the wet concrete and extruding the paste throughout a small nozzle guided by a specifically designed concrete 3D-printer. Due to very high fatigue resistance of carbon fibers, this study is looking at bone shaped tensile specimens under high cyclic fatigue load, hi order to obseive the process of crack growth and the mechanics of fatigue failure, we combined measuring techniques as digital image correlation and electrical resistivity measurement. Carbon fibers are electrical conductive and they transfer this ability to the compound material and to the specimen. By measuring the voltage drop at several specific points 011 the specimen’s surface, allows to detect material degradation. The amount of electrodes and connection nodes were increased continuously in order to enhance accuracy and to obtain a localization of material degradation. Comparing the results with digital image correlation, both measuring methods show up parallels, meaning changes in strain are also visible in conductivity measurement.

Original languageEnglish
Title of host publicationProceedings of the 2021 session of the 13th fib International PhD Symposium in Civil Engineering, 2021
EditorsFabrice Gatuingt, Jean-Michel Torrenti
Publisherfib. The International Federation for Structural Concrete
Pages258-265
Number of pages8
ISBN (Print)9782940643110
StatePublished - 2021
Event13th fib International PhD Symposium in Civil Engineering, 2021 - Virtual, Online
Duration: 21 Jul 202122 Jul 2021

Publication series

Namefib Symposium
ISSN (Print)2617-4820

Conference

Conference13th fib International PhD Symposium in Civil Engineering, 2021
CityVirtual, Online
Period21/07/2122/07/21

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